A strong 225/75R15 14-ply trailer tire combines trailer-specific construction with a load capacity that meets your trailer’s requirements. This comparison is for RV and trailer owners shopping for ST-size tires, not replacement tires for passenger vehicles or light trucks. The listed options include single tires and four-tire sets, with stated capacities from 3,000 to 3,527 pounds and several all-steel models.
Roundrule Xtra leads on the supplied specifications because it is an all-steel radial trailer tire with the highest listed capacity, 3,527 pounds. Venom Power Primo Hauler shares that capacity, while Libra’s GREAMX tire offers an explicitly stated 14-ply, load-range G rating and 3,420-pound capacity.
Check quantity, wheel fit, and your trailer’s actual load requirements before choosing.
Roundrule Xtra is the leading choice because its listing identifies an all-steel radial ST225/75R15 tire with a stated 3,527-pound load capacity, the highest listed here. Venom Power Primo Hauler matches that capacity, but Roundrule’s listing explicitly identifies the all-steel radial construction. For buyers prioritizing a clearly stated 14-ply, load-range G tire and a four-tire set, Libra GREAMX is another strong fit, with 3,420-pound capacity.
Confirm wheel compatibility and required load rating before ordering.
Our Top Picks

This all-steel radial ST225/75R15 tire lists 3,527 pounds of capacity, the highest figure supplied for the products compared.
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Highest CapacityIts ST225/75R15 all-steel listing gives it a 3,527-pound capacity, tied for the highest stated capacity in this group.
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Clear Load RatingThe listing explicitly states 14-ply, load range G, and 3,420-pound capacity, and describes the tire as all steel and trailer-only.
View on Amazon- Four-Tire Set Suntek HD Trail +
Compare These 225/75R15 Trailer Tire Options
| # | Product | Weight | Load Capacity | Rim Size | Size | Buy |
|---|---|---|---|---|---|---|
| 1 | 1. Roundrule XtraBest Overall | 46 lb | 3527 lb | 15 in | 225/75R15 (124/121M) | View on Amazon |
| 2 | 2. Venom Power Primo HaulerHighest Capacity | 45 lb | 3527 lb | 15 in | 225/75R15 | View on Amazon |
| 3 | 3. Libra GREAMXClear Load Rating | 38 lb | 3420 lb | 15 in | 225/75R15-14PR | View on Amazon |
| 4 | 4. Suntek HD Trail +Four-Tire Set | 188 lb | 3417 lb | 15 in | 225/75R15 | View on Amazon |
| 5 | 5. Transeagle ST RadialCommercial trailer tire shoppers | 48 lb | 3417 lb | 15 in | 225/75R15 | View on Amazon |
| 6 | 6. Cosmo Stray Kat III+All-season trailer tread focus | 188 lb | 3417 lb | 15 in | 225/75R15 | View on Amazon |
| 7 | 7. Nebula Grand Trailer-N' 007All-season highway trailer use | 180 lb | 3417 lb | 15 in | 225/75R15 | View on Amazon |
| 8 | 8. Tourador MaxForce ST02Changing-weather trailer towing | 112 lb | 3417 lb | 15 in | 225/75R15 | View on Amazon |
| 9 | 9. Cosmo Stray Kat III+ SingleHeavy-load highway trailer hauls | 47 lb | 3000 lb | 15 in | ST225/75R15 | View on Amazon |
| 10 | 10. ZEEMAX GREMAX HDHeavy RV replacement tires | 50 lb | 3420 lb | 16 in | 225/75R15 All Steel | View on Amazon |
Detailed Reviews: Best 225 75R15 Trailer Tires 14 Ply

#1 · Best Overall
1. Roundrule Xtra
- Weight: 46 lb
- Load Capacity: 3527 lb
- Rim Size: 15 in
- Size: 225/75R15 (124/121M)
Best for: Higher listed load capacity.
Why it ranks #1: This all-steel radial ST225/75R15 tire lists 3,527 pounds of capacity, the highest figure supplied for the products compared.
Roundrule lists a 3,527-pound load capacity, the highest stated figure among the supplied 225/75R15 options at this level. Its all-steel radial construction, all-season G rating, and 14-ply specification give trailer owners concrete details for comparing a tire intended for special-trailer use.
The 3,527-pound listed capacity provides a direct load figure for buyers checking trailer requirements, and Roundrule describes its special-trailer tires as able to handle large loads. All-steel radial construction and a 14-ply G rating add useful construction and classification details. The 225/75R15 size and 15-inch rim specification help guide setup checks. It is sold as a tire only, so this listing does not provide a rim alongside the tire.
- 3,527-pound listed load capacity
- All-steel radial construction
- 14-ply, all-season G specification
- Brand identifies it as a special-trailer tire
- The listing includes the tire only, not a rim.
Skip it if you need rims in the same listing; Roundrule includes the tire only, so arrange the wheel separately.
Roundrule suits trailer owners whose load checks call for a listed 3,527-pound capacity and who want an all-steel radial tire. Verify the 225/75R15 and 15-inch rim specifications against the trailer setup.
Full product details
| Brand | Roundrule |
|---|---|
| Included Components | Tire Only |
| Item Dimensions | 27 x 27 x 8 inches |
| Item Weight | 46 pounds |
| Load Capacity | 3527 pounds |
| Manufacturer | Roundrule |
| Part Number | P70011-R |
| Model Number | P70011-R |
| Rim Size | 15 inches |
| Size | 225/75R15 (124/121M) |
| Vehicle Tire ISO Metric Size Description | 225/75R15 |
Listed on Amazon as: Roundrule Xtra ST225/75R15 All Season G (14 Ply) All Steel Radial Tire
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#2 · Highest Capacity
2. Venom Power Primo Hauler
- Weight: 45 lb
- Load Capacity: 3527 lb
- Rim Size: 15 in
- Size: 225/75R15
Best for: Higher-capacity all-steel option.
Why it ranks #2: Its ST225/75R15 all-steel listing gives it a 3,527-pound capacity, tied for the highest stated capacity in this group.
Venom Power lists a 3,527-pound capacity for the Primo Hauler, giving load-conscious trailer owners a concrete figure to compare. The tire is specified as all-steel, 14-ply, all-season G in 225/75R15, with a 15-inch rim size and tire-only inclusion.
The stated 3,527-pound capacity is useful for comparing the Primo Hauler with trailer load requirements, while its all-steel construction and 14-ply G rating identify its heavy-duty specification. The all-season designation gives buyers another selection criterion for year-round use. Its 225/75R15 size and 15-inch rim specification help with setup checks. This listing includes the tire only, so buyers needing rims must source them separately; the supplied description does not specify a particular tread pattern.
- 3,527-pound listed load capacity
- All-steel construction
- 14-ply, all-season G specification
- 225/75R15 size with 15-inch rim specification
- The listing includes the tire only, not a rim.
Skip it if you need rims included with your tire; this Venom Power listing specifies tire only, so arrange wheels separately.
The Primo Hauler suits trailer owners comparing all-steel, 14-ply options with a listed 3,527-pound capacity. Its 225/75R15 and 15-inch rim specifications merit a setup check, and rims are not included.
Full product details
| Brand | VENOM POWER |
|---|---|
| Included Components | Tire Only |
| Item Dimensions | 27 x 27 x 8 inches |
| Item Weight | 45 pounds |
| Load Capacity | 3527 pounds |
| Manufacturer | Venom Power |
| Part Number | VPST19 |
| Manufacturer Warranty Description | Standard Manufacturer Warranty |
| Model Number | VPST19 |
| Rim Size | 15 inches |
| Size | 225/75R15 |
| Vehicle Tire ISO Metric Size Description | 225/75R15 |
Listed on Amazon as: Venom Power Primo Hauler ST225/75R15 All Season G (14 Ply) All Steel Tire
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#3 · Clear Load Rating
3. Libra GREAMX
- Weight: 38 lb
- Load Capacity: 3420 lb
- Rim Size: 15 in
- Size: 225/75R15-14PR
Best for: Heavy RV trailer hauling.
Why it ranks #3: The listing explicitly states 14-ply, load range G, and 3,420-pound capacity, and describes the tire as all steel and trailer-only.
All-steel construction pairs with a 14-ply rating and a stated 3,420-pound capacity, giving heavy RV and trailer owners a tire aimed at substantial loads. The 225/75R15 size is presented as a replacement for regular ST225/75R15 tires, while the trailer-only designation keeps its intended application clear.
The load range G rating and 3,420-pound capacity suit buyers comparing tires for big, heavy RVs or trailers. Its all-steel construction is the defining build feature, and the 14-ply rating identifies its heavy-duty positioning. The stated 225/75R15 size offers a direct specification match for replacing regular ST225/75R15 tires. This is a tire-only purchase, so plan separately for rims and installation; it is not intended for use on a light truck.
- All-steel construction
- 14-ply rated, load range G
- 3,420-pound stated load capacity
- Specified as a replacement for regular ST225/75R15 tires
- Trailer use only; rims are not included.
Skip it if you need a tire for a light truck or want rims included; this is trailer-only and the listing excludes rims.
For owners replacing regular ST225/75R15 tires on a heavy RV or trailer, this Libra option combines all-steel construction with a stated 3,420-pound capacity. Keep its trailer-only application and rim-free listing in mind.
Full product details
| Brand | Libra Trailer Parts |
|---|---|
| Item Dimensions | 29 x 9 x 29 inches |
| Item Weight | 38 pounds |
| Load Capacity | 3420 pounds |
| Manufacturer | Libra Trailer Parts |
| Part Number | 225/75R15 |
| Model Number | GM500 |
| Rim Size | 15 inches |
| Size | 225/75R15-14PR |
| Vehicle Tire ISO Metric Size Description | 225/75R15 |
Listed on Amazon as: GREAMX Heavy Duty All Steel Trailer Tires 225/75R15 14 Ply 123/119M -Set 4
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#4 · Four-Tire Set
4. Suntek HD Trail +
- Weight: 188 lb
- Load Capacity: 3417 lb
- Rim Size: 15 in
- Size: 225/75R15
Best for: All-steel trailer tire buyers.
Why it ranks #4: The title specifies four all-steel, 14-ply ST225/75R15 tires, with a listed load capacity of 3,417 pounds.
The Suntek HD Trail + combines an all-steel build with an all-season G, 14-ply rating in the 225/75R15 size. That combination gives trailer owners a clearly specified heavy-duty tire option, with a listed load capacity of 3,417 pounds and a 15-inch rim size.
Its 3,417-pound load capacity gives buyers a concrete figure for evaluating trailer load requirements, while the 14-ply, all-steel specification identifies the tire’s heavy-duty construction. The 225/75R15 size and 15-inch rim specification help with selection against the trailer’s existing setup. The listing identifies the included component as tire only, so rims are not part of the package. Suntek also describes its tire range as offering durability, traction, and handling.
- All-steel construction
- 14-ply, all-season G specification
- 3,417-pound listed load capacity
- 225/75R15 size with 15-inch rim specification
- The listing includes tires only, not rims.
Skip it if you need rims included with your tire purchase; this Suntek listing specifies tire only, so source rims separately.
This Suntek suits trailer owners seeking an all-steel, 14-ply tire in 225/75R15 and who can source rims separately. Its listed 3,417-pound capacity is a useful comparison point when checking trailer requirements.
Full product details
| Brand | Suntek |
|---|---|
| Included Components | Tire Only |
| Item Dimensions | 27 x 27 x 8 inches |
| Item Weight | 188 pounds |
| Load Capacity | 3417 pounds |
| Manufacturer | Suntek |
| Part Number | TK0006 |
| Model Number | TK0006 |
| Rim Size | 15 inches |
| Size | 225/75R15 |
| Vehicle Tire ISO Metric Size Description | 225/75R15 |
Listed on Amazon as: 4 x Suntek HD Trail + ST225/75R15 All Season G (14 Ply) All Steel Tires
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#5
5. Transeagle ST Radial
- Weight: 48 lb
- Load Capacity: 3417 lb
- Rim Size: 15 in
- Size: 225/75R15
Best for: Commercial trailer tire shoppers.
Why it ranks #5: This all-steel, 14-ply ST radial tire matches the requested size and load range, with a listed capacity of 3,417 pounds.
Transeagle specifies an all-steel, 14-ply G tire with a 3,417-pound load capacity, making its heavy-duty construction and rated load the main selection cues. The ST225/75R15 size is listed with a 15-inch rim size, for buyers matching a trailer tire to that specification.
The listed 3,417-pound capacity helps trailer owners compare load ratings, while the 14-ply G specification establishes this tire’s heavy-duty category. Transeagle describes its commercial and trailer tires as offering handling, load durability, and traction, which speaks to the demands of towing. At 225/75R15 with a 15-inch rim size, it has specific sizing information for setup checks. The listing states tire only and provides no manufacturer warranty, so plan around those purchase details.
- All-steel construction
- 14-ply, all-season G rating
- 3,417-pound listed load capacity
- Brand describes handling, load durability, and traction
- No manufacturer warranty is listed.
Skip it if you require a stated manufacturer warranty; this Transeagle listing says none, so consider the Libra GREAMX if its listed heavy-duty details suit you.
Choose this Transeagle for a trailer needing the listed 225/75R15 size and a 14-ply, 3,417-pound-rated tire. It fits buyers valuing the brand’s stated handling and traction claims, but warranty coverage is not listed.
Full product details
| Brand | Transeagle |
|---|---|
| Included Components | Tire Only |
| Item Dimensions | 27 x 27 x 8 inches |
| Item Weight | 48 pounds |
| Load Capacity | 3417 pounds |
| Manufacturer | Transeagle |
| Part Number | TA17B |
| Manufacturer Warranty Description | No |
| Model Number | TA17B |
| Rim Size | 15 inches |
| Size | 225/75R15 |
| Vehicle Tire ISO Metric Size Description | 225/75R15 |
Listed on Amazon as: Transeagle ST Radial ST225/75R15 All Season G (14 Ply) All Steel Tire
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#6
6. Cosmo Stray Kat III+
- Weight: 188 lb
- Load Capacity: 3417 lb
- Rim Size: 15 in
- Size: 225/75R15
Best for: All-season trailer tread focus.
Why it ranks #6: This four-tire all-steel set is listed in 225/75R15 with 14-ply load range G and 3,417-pound capacity.
Cosmo’s Stray Kat III+ pairs a ribbed tread pattern with an all-season compound, features described as enhancing traction in dry, wet, and winter weather. The 14-ply G tire lists a 3,417-pound capacity in 225/75R15 for trailer owners comparing all-season options.
The ribbed tread and all-season compound are specifically linked to traction in dry, wet, and winter weather, giving the tire a clear weather-oriented use case. Its highway-terrain positioning is for trailers, not light trucks. A 14-ply G rating and 3,417-pound load capacity offer load-related details, while the 225/75R15 size and 15-inch rim specification help with setup checks. The listing identifies four tires and says the included component is tire only.
- Ribbed tread pattern
- All-season compound for dry, wet, and winter weather
- 14-ply G specification
- Four tires listed, with 3,417-pound capacity
- Not intended for mounting on light trucks.
Skip it if you need tires for a light truck; Cosmo states this Stray Kat III+ is for trailers, not light trucks.
This four-tire Cosmo listing suits trailer owners seeking ribbed tread and an all-season compound for varied weather. Check the 3,417-pound capacity and trailer-only application against your towing setup before choosing it.
Full product details
| Brand | Cosmo Tires |
|---|---|
| Included Components | Tire Only |
| Item Dimensions | 27 x 27 x 8 inches |
| Item Weight | 188 pounds |
| Load Capacity | 3417 pounds |
| Manufacturer | Cosmo Tires |
| Part Number | 80679381 |
| Model Number | 80679381 |
| Rim Size | 15 inches |
| Size | 225/75R15 |
| Vehicle Tire ISO Metric Size Description | 225/75R15 |
Listed on Amazon as: Cosmo Stray Kat III+ ST225/75R15 All Season G (14 Ply) All Steel Four Tires
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#7
7. Nebula Grand Trailer-N' 007
- Weight: 180 lb
- Load Capacity: 3417 lb
- Rim Size: 15 in
- Size: 225/75R15
Best for: All-season highway trailer use.
Why it ranks #7: Its 14-ply ST225/75R15 listing gives 3,417-pound capacity and specifically describes a trailer-oriented, all-season highway tire.
Nebula’s Grand Trailer-N’ 007 is identified as a highway-terrain, all-season trailer tire, with a tread pattern and compound described for dry, wet, and winter conditions. Its 14-ply G rating and 3,417-pound load capacity give trailer owners additional specifications for assessing a demanding towing setup.
The all-season compound and tread pattern are described as working together to improve performance in dry, wet, and winter conditions, which matters to trailer owners traveling through changing weather. Its highway-terrain positioning clarifies the intended driving context. A 14-ply G rating and 3,417-pound listed capacity provide load-related specifications, while the 225/75R15 size and 15-inch rim size support setup checks. Nebula explicitly says this tire is for trailers, not light trucks.
- All-season compound for dry, wet, and winter conditions
- Highway-terrain trailer tire
- 14-ply G rating
- 3,417-pound listed load capacity
- Not intended for mounting on light trucks.
Skip it if you need a tire for a light truck; Nebula specifies trailer use, while the Transeagle listing also identifies commercial tires.
This Nebula is for trailer owners seeking an all-season highway-terrain tire with a stated 3,417-pound capacity. Its weather-oriented compound and tread description are relevant, but its trailer-only application rules out light-truck use.
Full product details
| Brand | Nebula |
|---|---|
| Included Components | Tire Only |
| Item Dimensions | 27 x 27 x 8 inches |
| Item Weight | 180 pounds |
| Load Capacity | 3417 pounds |
| Manufacturer | Nebula |
| Part Number | NBST90787-TH |
| Model Number | NBST90787-TH |
| Rim Size | 15 inches |
| Size | 225/75R15 |
| Vehicle Tire ISO Metric Size Description | 225/75R15 |
Listed on Amazon as: 4 x Nebula Grand Trailer-N' 007 ST225/75R15 All Season G (14 Ply) Tires
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#8
8. Tourador MaxForce ST02
- Weight: 112 lb
- Load Capacity: 3417 lb
- Rim Size: 15 in
- Size: 225/75R15
Best for: Changing-weather trailer towing.
Why it ranks #8: This four-tire ST225/75R15 listing identifies 14-ply load range G and 3,417-pound capacity for trailer use.
Tourador describes the MaxForce ST02’s all-season compound as staying pliable through changing temperatures, giving trailer owners a weather-focused feature to consider. The 14-ply G tire also lists a 3,417-pound capacity in 225/75R15, with highway-terrain positioning for trailer use.
Tourador connects its all-season compound with pliability in changing temperatures, a practical detail for owners who tow through shifts in weather. The tire’s tread pattern is described as improving traction in dry conditions, adding another stated operating benefit. Its 14-ply G rating and 3,417-pound load capacity help buyers assess load needs, while the 225/75R15 size and 15-inch rim specification guide setup checks. The description says it is for trailers, not light trucks.
- All-season compound described as pliable in changing temperatures
- Tread pattern described as improving dry traction
- 14-ply G rating
- 3,417-pound listed load capacity
- Not made to be mounted on light trucks.
Skip it if you need a light-truck tire; Tourador says this model is for trailers, while the Transeagle listing includes commercial tires.
The MaxForce ST02 fits trailer owners seeking an all-season option with stated temperature flexibility and dry-traction features. Its 3,417-pound capacity supports load comparisons, but the listed application excludes light trucks.
Full product details
| Brand | Tourador |
|---|---|
| Included Components | Tire Only |
| Item Dimensions | 27 x 27 x 8 inches |
| Item Weight | 112 pounds |
| Load Capacity | 3417 pounds |
| Manufacturer | Tourador |
| Part Number | TR1060 |
| Model Number | TR1060 |
| Rim Size | 15 inches |
| Size | 225/75R15 |
| Vehicle Tire ISO Metric Size Description | 225/75R15 |
Listed on Amazon as: 4 x Tourador MaxForce ST02 ST225/75R15 All Season G (14 Ply) Tires
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#9
9. Cosmo Stray Kat III+ Single
- Weight: 47 lb
- Load Capacity: 3000 lb
- Rim Size: 15 in
- Size: ST225/75R15
Best for: Heavy-load highway trailer hauls.
Why it ranks #9: It is a 14-ply ST225/75R15 trailer tire, but its stated 3,000-pound capacity is lower than the other clear-fit options.
Cosmo describes the Stray Kat III+ as an all-steel radial with full steel belts, connecting its construction to demanding trailer work. Its 14-ply Load Range G specification and stated 3,000-pound capacity give buyers load details to weigh against long highway hauls and heavy towing needs.
The full steel belts are part of the listed all-steel radial construction, which Cosmo positions for heavy loads and long highway hauls. The 14-ply, Load Range G specification helps identify its heavy-duty category, but the stated 3,000-pound capacity is important to check against a trailer’s requirements. Its ST225/75R15 size and 15-inch rim specification support setup comparisons. The product is listed as a tire, rather than a set of four.
- All-steel radial construction with full steel belts
- 14-ply Load Range G
- ST225/75R15 size
- Cosmo positions it for heavy loads and long highway hauls
- Listed load capacity is 3,000 pounds.
Skip it if you need a listed capacity above 3,000 pounds; the Roundrule Xtra lists 3,527 pounds for buyers whose load requirements call for more.
This Cosmo suits trailer owners prioritizing the stated all-steel radial construction for highway towing. Its 3,000-pound capacity is the key boundary: check it against your load needs before selecting this ST225/75R15 tire.
Full product details
| Brand | Cosmo Tires |
|---|---|
| Included Components | Tire |
| Item Dimensions | 27 x 27 x 8 inches |
| Item Weight | 47 pounds |
| Load Capacity | 3000 pounds |
| Manufacturer | Cosmo |
| Part Number | 80679381 |
| Model Number | 80679381 |
| Rim Size | 15 inches |
| Size | ST225/75R15 |
| Vehicle Tire ISO Metric Size Description | 225/75R15 |
Listed on Amazon as: Cosmo Tires Stray Kat III+ ST225/75R15 Trailer Tire – Load Range G 14-Ply
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#10
10. ZEEMAX GREMAX HD
- Weight: 50 lb
- Load Capacity: 3420 lb
- Rim Size: 16 in
- Size: 225/75R15 All Steel
Best for: Heavy RV replacement tires.
Why it ranks #10: The listing states 14-ply and 3,420-pound capacity, but its size description says 225/75R15 while its rim size is listed as 16 inches.
GREMAX pairs an all-steel, 14-ply Load Range G construction with a stated 3,420-pound capacity for big RVs and trailers. The listing also gives a maximum load of 3,420 pounds at 110 psi, providing a specific pressure-linked figure for buyers reviewing this trailer-only tire.
The 3,420-pound maximum load at 110 psi gives owners a stated load-and-pressure reference, while the 14-ply, Load Range G all-steel construction identifies its heavy-duty positioning. GREMAX describes it as a replacement for regular ST225/75R15 tires, which is useful when matching a replacement specification. It is intended for trailer use only, and rims are not included. The listed size is 225/75R15, though the rim-size field also says 16 inches, so check that discrepancy before purchase.
- All-steel construction
- 14-ply Load Range G
- 3,420-pound maximum load stated at 110 psi
- Listed as a replacement for regular ST225/75R15 tires
- The specifications conflict: 225/75R15 size, but a 16-inch rim size is listed.
Skip it if you need consistent rim-size specifications before ordering; this listing says 225/75R15 but also lists a 16-inch rim size.
GREMAX may suit heavy RV or trailer owners seeking a stated 3,420-pound, 14-ply tire. Its trailer-only use and excluded rims matter, and the conflicting rim-size field makes specification verification especially important.
Full product details
| Brand | ZEEMAX |
|---|---|
| Item Dimensions | 32 x 8 x 32 inches |
| Item Weight | 50 pounds |
| Load Capacity | 3420 pounds |
| Manufacturer | ZEEMAX |
| Part Number | ST225/90R16 |
| Manufacturer Warranty Description | 1 Year Warranty |
| Rim Size | 16 inches |
| Size | 225/75R15 All Steel |
| Vehicle Tire ISO Metric Size Description | 225/75R15 |
Listed on Amazon as: GREMAX 4 HD All Steel Trailer Tires ST225/75R15 14PR Load Range G 123/119M
View on AmazonAvoid a size and wheel-fit mismatch
A tire’s size label and the wheel specification both need to match your trailer; do not rely on one field alone. The ZEEMAX GREMAX HD listing illustrates why: it identifies the tire as 225/75R15, yet lists a 16-inch rim size and a manufacturer part number of ST225/90R16. Those conflicting details make fitment uncertain, so verify the exact tire and wheel requirements with the seller or manufacturer before ordering.
Also distinguish tire-only listings from complete wheel-and-tire assemblies: several products say tire only, and Libra states that rims are not included. A 15-inch rim specification appears on most listings, but matching the nominal rim diameter alone does not confirm clearance, load suitability, or compatibility with your trailer.
Check the trailer’s existing tire placard, wheel markings, and manufacturer guidance rather than assuming that the same 225/75R15 label guarantees interchangeability.
Do not treat tire capacity as trailer capacity
A tire’s listed load capacity is not the same as the safe carrying capacity of your trailer. The figures here range from 3,000 pounds for the single Cosmo Stray Kat III+ listing to 3,527 pounds for Roundrule Xtra and Venom Power Primo Hauler. Those numbers apply to the tire as listed; they do not account for axle limits, unequal loading, or the capacity of the wheel and trailer.
A common planning error is to multiply a tire’s capacity by the number of tires and assume that total is automatically usable payload. Instead, follow the trailer and axle ratings, account for the loaded trailer’s actual weight distribution, and confirm that every tire and wheel meets the required rating.
The listings also vary between individual tires and four-tire sets, so check the quantity before calculating what your setup needs.
How to Choose a 225/75R15 Trailer Tire
Listed load capacity
Choose a tire whose capacity meets your trailer’s requirements; do not select by the highest number alone. These listings range from 3,000 pounds for Cosmo Stray Kat III+ Single to 3,417 pounds for several models, 3,420 pounds for Libra GREAMX and ZEEMAX GREMAX HD, and 3,527 pounds for Roundrule Xtra and Venom Power Primo Hauler. Buyers needing the higher listed capacity can compare Roundrule and Venom, while those whose setup calls for around 3,420 pounds can consider Libra’s clearly stated rating.
Confirm the required rating from your trailer and axle information, and make sure the wheel and tires work together. A tire’s individual capacity does not raise the trailer’s permitted gross or axle weight.
Construction and stated tire rating
Look for the construction and load designation that your trailer requires, then confirm each detail on the specific listing. Libra GREAMX explicitly identifies an all-steel tire, 14-ply rating, load range G, and 123/119M. ZEEMAX also states 14-ply, load range G, and all-steel construction, though its rim and size details conflict.
Roundrule Xtra is described as an all-steel radial and shows size 225/75R15 (124/121M); several other products list 14-ply load range G without providing a speed symbol in the supplied specifications. Buyers who need a clearly stated load range and ply rating may prefer Libra; those comparing a higher listed capacity can consider Roundrule.
Verify the complete sidewall designation rather than treating ply rating and load range as interchangeable terms.
Quantity and purchase format
Check whether the listing is for one tire or a set, because the products are offered in different quantities. Suntek HD Trail +, Tourador MaxForce ST02, and Cosmo Stray Kat III+ identify four tires in their titles; Libra GREAMX also has “Set 4” in its title. Roundrule Xtra, Transeagle ST Radial, Nebula Grand Trailer-N’ 007, Cosmo Stray Kat III+ Single, and Venom Power Primo Hauler are presented as individual tires in their titles or product descriptions.
For a complete replacement, a four-tire listing may better match the quantity you need, while a single tire suits an individual replacement if it matches the remaining tires. Confirm the actual package quantity and whether rims are included before purchase; several listings specify tire only.
Which 225/75R15 14-ply tire should you choose?
Roundrule Xtra is the strongest overall match if you want an all-steel radial ST225/75R15 tire with the highest listed capacity, 3,527 pounds. Choose Venom Power Primo Hauler if you want the same stated capacity in an all-steel tire. For an explicitly specified 14-ply, load-range G option rated at 3,420 pounds, Libra GREAMX is a clear alternative; its title also identifies a set of four.
Suntek HD Trail + and Cosmo Stray Kat III+ are listed as four-tire sets with 3,417-pound capacities. If replacing one tire, Cosmo Stray Kat III+ Single is a single-tire option, but its stated 3,000-pound capacity is lower.
Avoid assuming ZEEMAX GREMAX HD fits a 15-inch wheel until its conflicting size and rim details are verified.
Frequently Asked Questions
How do I calculate the load rating my trailer tires need?
Start with the trailer’s loaded weight and the load carried by each axle; divide each axle’s load by the number of tires supporting it. Account for uneven loading and follow the trailer or tire manufacturer’s guidance. Choose tires whose capacity meets or exceeds the required load at the specified inflation pressure.
Can I mount ST trailer tires on a light truck?
Only if the vehicle or tire manufacturer permits that use and the tire meets the vehicle’s requirements. ST tires are designated for trailer service, so do not assume they can replace light-truck tires. Check the vehicle manual, tire placard, and applicable tire guidance before fitting them.
How can I confirm whether a 15-inch trailer tire fits my wheel and trailer?
Verify that the tire’s specified size matches the wheel diameter, then check wheel width and load capacity against tire and wheel guidance. Confirm clearance around the trailer through suspension travel and check that the rim details are consistent. If a listing has conflicting size or rim information, verify it before ordering.
Why compare tire construction as well as load capacity?
Listings can state the same load capacity while describing construction differently. In this roundup, Roundrule Xtra and Venom Power Primo Hauler are both listed at 3,527 pounds, but Roundrule explicitly identifies an all-steel radial tire. Compare the stated construction and capacity against your needs rather than assuming the listings are identical.
Should I buy a single tire or a matching set?
Choose a single tire when replacing one and the replacement matches the remaining tires in size, load rating, and other required specifications. A set can simplify replacing several tires together, but confirm each tire’s capacity and fit. This roundup includes both single-tire listings and listings identified as sets of four.
Final Words
For the strongest overall match, choose Roundrule Xtra: its listing identifies an all-steel radial ST225/75R15 tire and the highest stated capacity here, 3,527 pounds. Venom Power states the same capacity, while Libra GREAMX is a clear alternative when an explicitly stated 14-ply, load-range G tire and four-tire set matter. Before ordering, verify wheel fit and the load rating your trailer requires.

