Forerunner QH502 Tire Review
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Choosing a small trailer tire is mostly a fit-and-load decision, not a styling choice. The Forerunner QH502 in ST5.70-8 is built for compact boat and utility trailers that use an 8-inch wheel, but it only makes sense when its size and load rating match your trailer. This review explains its verified dimensions, 6-ply Load Range C construction, trailer-only limits, and everyday towing use. Its main strength is useful load support in a compact size, while its biggest limitation is narrow compatibility.
Quick Verdict
Rating: 8/10, recommended with fitment caveats
Best For: Small boat, utility, and light cargo trailers already using ST5.70-8 tires
Bottom Line: The QH502 offers a practical 910-pound maximum load rating per tire in a compact 6-ply bias design. It is a tire-only replacement and should be skipped when your trailer needs a different size, higher load capacity, or a verified speed rating.
Key Takeaways
- The Forerunner QH502 reviewed here is an ST5.70-8 trailer tire, not a passenger-car or light-truck tire.
- Its Load Range C, 6-ply-rated construction is listed for up to 910 pounds per tire at 75 PSI.
- The tire measures about 5.7 inches wide and 18.6 inches in overall diameter, with a recommended 4.5-inch rim width.
- It uses bias-ply construction and a ribbed, highway-oriented tread for compact boat and utility trailer service.
- The listing is for the tire only. You still need a compatible 8-inch wheel, valve, mounting, and balancing as required.
[Products Worth Considering]
This universal spare tire mount carrier holder is built for utility trailers and boat trailers, offering a secure fit for 4, 5, and 6 lug wheels. It supports multiple bolt pattern sizes and a heavy-duty load capacity while resisting rust with a durable finish. The design allows easy installation and lets you choose the steel beam height for a better fit.
Keep RV, trailer, or truck dual-axle tires protected with waterproof, UV-resistant covers that help guard against sunlight, snow, rust, and dirt. The dual tire covers are easy to install with a rope/bungee fastener for a stable fit that won’t easily slip. Designed for 27–30 inch diameter wheels, they help maintain tire condition through harsh weather.
Secure your trailer or RV tires with a scissor-style wheel chock stabilizer that applies opposing force to help prevent wheel shift. It fits tight wheel gaps from 3.5 inches up to 12 inches and works for travel trailers, campers, fifth wheels, toy haulers, and heavy-duty trucks. The surface uses new electrophoretic technology to help prevent rust for reliable travel use.
Forerunner QH502 Specifications
| Specification | Detail |
|---|---|
| Brand | Forerunner |
| Model | QH502 |
| Manufacturer part number | 49233C0001 |
| UPC | 817736022998 |
| Product type | Special Trailer tire |
| Size | ST5.70-8 / 5.70-8 |
| Construction | Bias ply |
| Load range | Load Range C, 6-ply rated |
| Maximum load | 910 pounds per tire |
| Maximum listed pressure | 75 PSI |
| Section width | About 5.7 inches |
| Overall diameter | About 18.6 inches |
| Rim diameter | 8 inches |
| Recommended rim width | 4.5 inches |
| Tread and season | Ribbed highway tread, all-season designation |
| Sidewall | Black sidewall |
| Package note | Tire only, wheel or rim not included |
What Is the Forerunner QH502 Tire?
The Forerunner QH502 is a compact bias-ply tire made specifically for trailers. The ST prefix identifies it as a Special Trailer tire, so it is designed for a free-rolling trailer axle rather than steering, driving, or braking duties on a passenger vehicle.
This version uses the 5.70-8 size and fits an 8-inch wheel with a recommended 4.5-inch rim width. Its compact diameter makes it relevant to many small boat trailers, utility trailers, garden trailers, and light cargo setups that already use the same size.
The main selling point is simple: you get a Load Range C tire with a 6-ply rating and a listed maximum capacity of 910 pounds per tire. That can provide useful support on a properly matched single-axle trailer, but the total trailer rating still depends on the axle, wheels, hubs, springs, coupler, and frame.
Before You Buy: Match the complete ST5.70-8 size, load range, wheel width, and required capacity to your trailer. Do not buy it only because the wheel diameter is 8 inches, and do not mount it on a car or light truck.
Who Should Buy It?
Best For
- Owners replacing an existing ST5.70-8 Load Range C trailer tire
- Small boat or utility trailers that remain within the tire and axle load limits
- Buyers who need a tire-only replacement for a compatible 8-inch wheel
Skip If
- Your trailer requires more than 910 pounds of capacity per tire
- You need a wheel-and-tire assembly rather than a loose tire
- Your current tire size, rim width, or service requirements differ
Fit and Compatibility
Correct fit starts with the full sidewall size, not the visual diameter. An ST5.70-8 tire is wider and taller than some other 8-inch trailer tires, so replacing a 4.80-8 with this model may reduce fender, frame, or suspension clearance. Measure the installed space and compare the current tire’s markings before ordering.
The recommended rim width is 4.5 inches. The wheel must also have the correct diameter, load rating, valve hardware, bolt pattern, and hub fit for your trailer. The tire listing does not include the wheel, and the tire’s load rating cannot raise the rating of an under-capacity wheel or axle.
Construction, Tread, and Road Behavior
The QH502 uses bias-ply construction. Bias trailer tires typically have a firm sidewall feel that can suit compact utility and boat trailers, especially where the tire may encounter curbs, ramp edges, or rough storage areas. The tradeoff is that a small bias tire may feel firmer and can build heat when overloaded, underinflated, or run faster than its marked limits.
Its ribbed, highway-oriented tread keeps the design focused on straight tracking rather than off-road traction. The all-season label means the compound and tread are intended for varied normal weather, but it should not be treated as a dedicated snow or ice tire.
Load Capacity and Inflation
The manufacturer’s specification for this size lists a maximum load of 910 pounds at 75 PSI. Two tires would therefore provide up to 1,820 pounds of combined tire capacity only when both are correctly installed, inflated, and loaded. Your usable trailer capacity may be lower because the axle, wheels, springs, hubs, and gross vehicle weight rating can impose stricter limits.
Check pressure when the tires are cold and follow the tire sidewall plus the trailer manufacturer’s placard or manual. Do not reduce pressure simply to soften the ride, because underinflation increases sidewall flex and heat. Also avoid exceeding the wheel’s pressure rating when fitting a higher-pressure trailer tire.
Pro Tip: Before a trip, compare both tires with the same cold-pressure gauge, then inspect for sidewall cracks, bulges, exposed cords, uneven wear, and valve-stem damage.
Installation and Setup
Because this is a loose tire, installation requires a compatible wheel and proper tire-mounting equipment. A tire shop can inspect the rim, install an appropriate valve stem, seat the beads, and check the assembly for leaks. Balancing requirements vary by trailer and service, so follow the trailer or tire professional’s recommendation.
Confirm that the tire’s rotation or sidewall instructions are followed if marked. After installation, verify fender and frame clearance with the trailer loaded within its normal range. Recheck lug-nut torque according to the wheel or trailer maker’s schedule, especially after the first towing cycle.
[Products Worth Considering]
Camco Trailer Aid Plus tandem tire ramp lifts your trailer for quick, safe tire changes with ample clearance from its 5 1/2-inch lift. It helps you change a flat tire without unloading cargo, making roadside and routine maintenance more efficient. The heavy-duty, waterproof and rustproof polymer design supports up to 15,000 lb and is built for easy portability and storage.
Mount your spare tire off the floor and onto your wall using an e-track spare tire carrier that helps you stay organized in trailers, garages, and warehouses. The upgraded double-fittings design improves stability versus single-fittings and supports greater load bearing. Install by snapping into e-track anchor points and securing the tire with a lug-nut style bolt setup for quick, secure storage.
How It Performs in Real Use
On a Small Boat Trailer
The compact 18.6-inch overall diameter and 910-pound rating can work well for a properly sized small boat trailer. The tire itself is suitable for trailer use near launch areas, but saltwater durability depends heavily on the wheel, valve, hubs, bearings, and hardware. Rinse those components after saltwater exposure and inspect them regularly.
On a Light Utility Trailer
For yard equipment, supplies, or light cargo, the Load Range C construction provides a useful capacity margin when the load is distributed evenly. It will not correct tongue-weight problems, an overloaded axle, or cargo that shifts during travel.
During Highway Towing
The ribbed tread is intended for highway service and steady trailer tracking. However, the available product data does not consistently state a speed rating for this exact listing. Follow the molded sidewall limit, trailer documentation, and local towing rules rather than assuming a common trailer-tire speed rating.
During Seasonal Storage
Small trailer tires can age while showing plenty of tread. Store the trailer away from standing water and prolonged sunlight where possible, maintain the recommended pressure, and inspect the date code and sidewalls before returning it to service. Replace a tire that shows cracking, deformation, impact damage, or other unsafe deterioration.
Maintenance and Safety
Inspect the QH502 before every towing day. Check cold pressure, tread condition, sidewalls, valves, wheel fasteners, and visible hub problems. Uneven wear can point to low pressure, overload, a bent axle, worn bearings, or alignment trouble, so replacing the tire alone may not solve the cause.
Do not mix incompatible sizes or capacities on the same axle. If one tire fails from age or damage, inspect the matching tire and the wheel before deciding whether to replace one or both. A trailer or tire professional can confirm safe matching when the existing equipment is unclear.
Pros and Cons
Pros
- Verified ST5.70-8 size for compatible compact trailers
- Load Range C, 6-ply rating with up to 910 pounds per tire
- Bias construction and ribbed tread suit routine trailer service
- 4.5-inch recommended rim width is clearly documented
- MPN and UPC make it easier to confirm the exact listing
Cons
- Fits only trailers that match this specific size and capacity
- Wheel or rim is not included
- A product-specific speed rating and treadlife warranty are not clearly listed
Is It Worth the Price?
The QH502 is best viewed as a budget-to-mid-range replacement tire for a narrow, clearly defined fitment. Its value comes from matching a common compact trailer size while providing documented Load Range C capacity and a manufacturer-listed 4.5-inch rim width.
It is worth considering when your current trailer already uses ST5.70-8 tires and 910 pounds per tire is sufficient. It is not the best fit when you need a mounted wheel assembly, a higher load range, or a product with clearly published speed and treadlife warranty details.
How It Compares to Alternatives
The Carlisle Sport Trail and Greenball Towmaster S378 are other 5.70-8 Load Range C options worth comparing when brand support or local availability matters. The Hi-Run SU02 is sold in a 5.70-8 8-ply version for buyers who need a higher-rated alternative, but you must still confirm its exact capacity, pressure, dimensions, and wheel compatibility before switching.
The Forerunner makes the most sense when you want a straightforward 6-ply ST5.70-8 tire and its documented 910-pound capacity fits your trailer. Compare the complete sidewall specifications rather than choosing by price alone.
Frequently Asked Questions
Does the Forerunner QH502 include a wheel?
No. This listing is for the tire only, so you need a compatible 8-inch wheel and appropriate mounting hardware. Confirm the wheel’s width, load rating, pressure rating, bolt pattern, and hub fit separately.
What rim width fits the ST5.70-8 QH502?
The manufacturer lists a recommended rim width of 4.5 inches for this 5.70-8 version. An 8-inch wheel with a different width should not be assumed compatible without confirmation.
How much weight can one QH502 tire carry?
The listed maximum is 910 pounds per tire at 75 PSI for this size. Your trailer’s usable limit may be lower because the axle, wheel, hub, spring, and frame ratings also apply.
Can the Forerunner QH502 be used on a car or light truck?
No. It is a Special Trailer tire intended for trailer axles only. It is not designed for steering or drive-axle service on passenger vehicles or light trucks.
Is it suitable for a saltwater boat trailer?
The tire is marketed for boat trailer use, but no special saltwater certification is clearly stated. Saltwater corrosion mainly threatens the wheel, valve, hubs, bearings, brakes, and fasteners, so rinse and inspect those parts after exposure.
What is the tire’s speed rating?
A speed rating is not consistently shown in the available specifications for this exact listing. Check the tire sidewall and follow the trailer maker’s limits and local towing rules rather than assuming a rating.
How can you confirm this is the exact QH502 version?
Look for model QH502, size ST5.70-8, MPN 49233C0001, and UPC 817736022998 in the listing. Then compare the delivered tire’s sidewall markings before mounting it.
What warranty or return coverage applies?
A product-specific treadlife warranty is not clearly published in the verified specifications. Return terms can vary by seller, so read the current listing and warranty details before ordering or mounting the tire.
The Bottom Line
The Forerunner QH502 is a sensible choice for a small trailer that already requires an ST5.70-8 Load Range C tire. Its clear strengths are a compact fit, 6-ply bias construction, and a documented 910-pound capacity, while its main drawbacks are tire-only packaging and limited published speed or warranty information. Skip it when your current size, wheel, or load needs do not match exactly.
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