Disclosure: As an Amazon Associate, we earn from qualifying purchases. If you click a link on this page and make a purchase, we may receive a small commission at no extra cost to you.
Replacing trailer tires sounds simple until you need to match the tire size, wheel diameter, bolt pattern, load range, and speed rating at the same time. The MERXENG ST175/80D13 tire-and-wheel set removes the mounting step by arriving as two complete assemblies on 13-inch white spoke rims. Each bias-ply tire is rated Load Range C with a 6-ply rating and a listed maximum load of 1,360 pounds. This review explains where the set fits well, what you still need to measure, and why its J speed rating is an important limitation for faster highway towing.
Quick Verdict
Quick Verdict
Rating: 8.4/10, recommended with fitment and speed caveats
Best For: Utility, boat, cargo, and small camper trailers that already use ST175/80D13 tires and a 5-lug on 4.5-inch hub pattern
Bottom Line: You get two ready-to-bolt-on assemblies with a useful 1,360-pound capacity per tire. The tradeoff is limited compatibility and a J speed rating, so you must confirm every fitment and operating requirement before ordering.
Key Specifications
| Specification | Detail |
|---|---|
| Brand | MERXENG |
| Model | 11206020 |
| Product type | Trailer tire and wheel assemblies |
| Package quantity | Set of 2 |
| Tire size | ST175/80D13 |
| Construction | Bias-ply, 6-ply rated |
| Load range | Load Range C |
| Maximum listed load | 1,360 pounds per tire |
| Speed rating | J |
| Wheel size | 13-inch white spoke rim |
| Bolt pattern | 5 lugs on a 4.5-inch bolt circle |
| Overall tire diameter | 24 inches |
| Section width | 177 mm |
| Tread depth | 6.5 mm |
| Best use | Compatible trailer applications that match every size, load, clearance, and hub requirement |
Before You Buy: ST175/80D13 alone does not guarantee fit. Confirm the 5-on-4.5 bolt pattern, center bore, wheel offset, stud size, fender clearance, axle rating, required cold pressure, and the trailer maker’s approved tire size.
Key Takeaways
- The set includes two tires already mounted on rims, so you avoid paying a shop to mount loose tires.
- The 5-on-4.5 bolt pattern is common, but center bore, offset, stud size, and clearance still need to match.
- The 1,360-pound figure applies to each tire under the conditions shown on its sidewall, not to the complete trailer by itself.
- The J speed rating is a meaningful limit. Use the lowest applicable limit from the tire, wheel, trailer, axle, and local law.
What Is the MERXENG ST175/80D13 Set?
This MERXENG package is a pair of special-trailer tires mounted on matching 13-inch white spoke rims. The “ST” designation identifies a tire intended for trailer service, while “D” in ST175/80D13 indicates bias-ply construction. The assembly is designed as a replacement or spare for trailers that already use the same dimensions and 5-on-4.5 wheel pattern.
The main selling point is convenience. You receive complete wheel-and-tire assemblies instead of loose tires, which removes the separate mounting step. You still need to inspect the assemblies, confirm pressure from the sidewall and trailer placard, and install them using the trailer manufacturer’s lug-torque procedure.
Who Should Buy It?
Best For
- Owners replacing two worn ST175/80D13 assemblies on a matching 5-on-4.5 trailer hub
- Boat, utility, cargo, or small camper trailers that stay within the stated tire and axle limits
- Buyers who want complete assemblies for faster installation or ready-to-use spares
Skip If
- Your trailer uses a different bolt circle, center bore, wheel offset, load range, or tire size
- You need a higher speed rating or more than 1,360 pounds of capacity per tire
- You specifically want radial ST175/80R13 tires for your towing pattern
Fit and Compatibility
The wheel uses five lugs on a 4.5-inch bolt circle. That pattern is common on many small and midsize trailers, but “common” does not mean universal. Measure the existing wheel or verify the trailer documentation before ordering. Also confirm the center hole clears the hub, the wheel offset matches, and the mounted tire will not rub the fender, suspension, frame, or neighboring tire.
Load capacity also needs a full-trailer check. Two tires at 1,360 pounds each provide 2,720 pounds of combined listed tire capacity, but your usable limit can be lower because the axle, hub, wheel, trailer frame, hitch, and manufacturer ratings all matter. Never use tire capacity to justify loading above the trailer’s GVWR or axle rating.
Bias-Ply Build and Load Capacity
These are bias-ply tires, built with cord layers arranged diagonally across the casing. That design generally gives the sidewall a firm, supportive feel and can work well on utility routes, boat ramps, local roads, and uneven surfaces. The tradeoff is that buyers who spend more time at sustained highway speeds may prefer to compare radial options that match their trailer requirements.
The 6-ply rating is a strength category, not a literal count of six physical fabric layers. Load Range C and the listed 1,360-pound maximum per tire are the numbers that matter for capacity. Read the sidewall before use because the load rating is tied to the tire’s marked cold inflation requirements.
Installation and Setup
Pre-mounted assemblies save time, but installation is not only a matter of tightening five lug nuts. Before lifting the trailer, park on firm, level ground, chock the opposite wheel, use a jack rated for the load, and support the trailer at the points named by its manufacturer. Never work under a trailer supported only by a jack.
Clean the hub mounting face, check the studs and lug nuts for damage, and install the wheel in the correct orientation. Tighten the lug nuts in a star pattern to the trailer or wheel manufacturer’s torque specification. Recheck torque after the initial break-in distance specified by the trailer or wheel maker.
Pro Tip: Photograph the existing tire sidewall, wheel stamping, hub, and trailer data plate before shopping. Those four photos make it easier to compare size, load range, bolt pattern, pressure, and axle requirements without relying on memory.
How It Performs in Real Use
For Utility and Cargo Trailers
The complete assembly format is useful when downtime matters. A matching pair can replace two aging wheels at once, and a spare assembly can be installed without arranging tire mounting during a trip. The set makes the most sense when your loads stay comfortably below every applicable rating.
For Boat Trailers
The size and bolt pattern can suit some boat trailers, but repeated water exposure makes maintenance more important. Rinse road salt or ramp residue from the wheels, inspect for coating damage, and check hubs and bearings according to the trailer maker’s schedule. Tire-and-wheel replacement does not replace bearing or brake service.
For Small Campers
The 24-inch overall diameter and 13-inch wheel format are common in lighter trailer applications. Before using them on a camper, account for the loaded trip weight, including water, batteries, propane, food, cargo, and accessories. A scale reading is more useful than the trailer’s empty weight.
For Long-Distance Towing
The J speed rating requires conservative trip planning. Do not assume that a road’s posted speed is safe for every trailer tire. Follow the lowest speed limit stated by the tire, wheel, trailer manufacturer, and local rules, and stop if you notice vibration, heat, pressure loss, bulges, cracking, or unusual tread wear.
What People Say
Buyer feedback in the source material is mainly positive about convenience, straightforward fit on matching hubs, air retention, and smooth towing. Those comments are useful, but they do not replace your own fitment and load checks because trailers vary in hub dimensions, axle ratings, and clearance.
Overall Sentiment: Positive
Pros and Cons
Pros
- Two complete tire-and-wheel assemblies reduce setup work
- ST175/80D13 size fits many compatible utility, boat, cargo, and camper trailers
- Load Range C rating supports up to 1,360 pounds per tire as marked
- Common 5-on-4.5 bolt pattern simplifies replacement for matching hubs
- Bias-ply construction can suit local hauling and uneven surfaces
Cons
- J speed rating may not suit buyers who tow faster for long periods
- Fit depends on more than tire size and lug count
- Warranty terms were not clear enough to treat as a confirmed buying benefit
Maintenance and Trailer Tire Safety
Check pressure when the tires are cold and use the pressure required by the trailer documentation and tire sidewall for the load. Inspect the tread and sidewalls before trips for cuts, cracks, bulges, punctures, exposed cords, or uneven wear. The NHTSA TireWise guidance also recommends regular cold-pressure checks and replacement when damage or unsafe wear appears.
Keep the set covered from prolonged sunlight when stored, avoid petroleum-based tire dressings, and do not rely on tread depth alone to judge age or condition. Record the tire identification code and date information from the sidewall after delivery. If a wheel arrives bent, a tire shows shipping damage, or the assembly does not seat correctly on the hub, stop and have a qualified trailer or tire professional inspect it.
Is It Worth the Price?
This set offers strong value when you need two matching assemblies and would otherwise pay separately for tires, wheels, mounting, and shop time. The ready-to-install format is especially useful for owners maintaining utility or boat trailers away from a full-service tire shop.
Value drops quickly if you need a different hub specification, higher load range, radial construction, or a faster speed rating. Compare total installed cost, not only the listing price, and verify return terms before mounting because installed automotive products can be harder to return.
How It Compares to Alternatives
The Kenda Loadstar ST175/80D13 bias tire with a 13-inch white wheel is a useful comparison if you prefer a more established trailer-tire line with detailed fitment documentation. An eCustomRim ST175/80D13 tire-and-wheel assembly is another close alternative in the same size and general format.
If you tow longer highway distances, also compare correctly rated ST175/80R13 radial assemblies. A radial option may better match that use, but only when its load capacity, wheel dimensions, bolt pattern, clearance, and trailer approval are correct.
Why Buyers Choose It
Buyers choose this MERXENG set mainly because it combines the tire and rim in one package. The common 5-on-4.5 pattern, 13-inch wheel size, and 1,360-pound listed capacity cover many small-trailer replacement needs, while the pair format helps keep both sides matched.
Frequently Asked Questions
Will these fit my trailer?
They fit only when your trailer calls for ST175/80D13 tires and the hub matches the 5-lug on 4.5-inch bolt circle. Confirm center bore, offset, stud size, wheel clearance, load range, and approved pressure before ordering.
Does the set include tires and rims?
Yes. The package is listed as two ST175/80D13 tires pre-mounted on two 13-inch white spoke rims. Inspect both assemblies on arrival and verify that the received variant matches the order.
Can I use them as an upgrade from a different tire size?
Do not treat them as a universal upgrade. Changing tire diameter, width, load range, or wheel offset can affect clearance, handling, braking, and bearing loads, so use only a size approved by the trailer manufacturer or a qualified professional.
Are they suitable for heavy loads?
Each tire lists a maximum load of 1,360 pounds under its specified conditions. Your safe trailer load is still limited by the lowest-rated part of the system, including the axle, wheels, hubs, frame, hitch, and GVWR.
Are they good for long highway trips?
They can be used only within the J speed rating and all trailer-maker limits. Buyers who regularly tow faster or for long highway stretches should compare properly matched radial assemblies with a suitable speed and load rating.
How should I maintain them?
Check cold pressure, inspect tread and sidewalls, and verify lug torque at the intervals stated by the trailer or wheel manufacturer. Keep stored tires out of prolonged sunlight and have damage, vibration, or repeated pressure loss inspected promptly.
What warranty comes with the set?
The available listings did not provide consistent warranty information for this exact offer. Check the current Amazon seller terms and manufacturer documentation before purchase, and save your order record and tire identification information.
Who should skip this set?
Skip it if your trailer needs another size, a different bolt pattern, more load capacity, or a higher speed rating. It is also not the best choice when the trailer maker specifically calls for radial tires or another wheel specification.
The Bottom Line
The MERXENG ST175/80D13 set is a practical buy for owners who have confirmed the exact tire, wheel, hub, load, and clearance match and want two pre-mounted assemblies. Its strongest benefit is installation convenience, while its main limitation is the J speed rating and the need for careful fitment verification. Skip it when your trailer requires a different size, higher capacity, radial construction, or faster rated tire.
Ready to Buy?
Check the current variant, seller terms, and product details before you decide.
