The best 31×13.50-15 implement tire depends on the equipment, tread needs, and load requirements. The Harvest King Rib Implement is a strong match for towed equipment, while the Firestone AG Rib and MRL I-1 options offer 12-ply ratings. The Firestone AG Turf has a different stated product type for buyers comparing turf-oriented options. Check the tire sidewall and equipment manual before choosing a replacement.
| Product | Best For | Listed Rating |
|---|---|---|
| Harvest King Rib Implement I-1 | Towed agricultural equipment | 10 ply, 120B |
| Agstar 4501 | Tractor use, all-season traction | 10 ply, 120B |
| Firestone AG Rib Implement Plus | Buyers seeking a 12-ply rib tire | 12 ply, 124B |
| Firestone AG Turf Implement Plus | Buyers comparing a turf implement tire | 10 ply, 120B |
| MRL MIM 104 Farm Implement I-1 | Buyers seeking a 12-ply I-1 tire | 12 ply, 124B |
Harvest King Rib Implement I-1
The Harvest King is designed for towed agricultural equipment, including wagons, spreaders, and trailers. Its I-1 ribbed tread is intended to provide traction and flotation. The product information also lists a wide tread, reinforced nylon cord casing, and a durable tread compound.
Best for: Buyers replacing a tire on towed farm equipment who want an I-1 rib design. It is selected for its stated implement applications and field-and-highway use description.
Consider: The listing describes tube or tubeless construction as options. Confirm which configuration applies to the tire being purchased and what your wheel requires.
Agstar 4501 Tractor Tire
The Agstar 4501 is a 31×13.50-15, 120B tire with a 10-ply rating. Its listed construction is bias, with one black sidewall and a 15-inch size designation. The product description identifies it for tractors and states that it provides all-season traction.
Best for: Tractor owners looking for a 10-ply, bias-construction option in this size. It is included because its stated use and dimensions directly match the search.
Consider: The provided features do not specify a particular tread pattern or a tube/tubeless configuration. Check those details against your tractor and wheel before ordering.
Firestone AG Rib Implement Plus
This Firestone Regency AG Rib Implement Plus is listed in 31×13.50-15 with a 124B rating and 12-ply rating. The features identify it as a bias tire for tractors, with all-season traction, one black sidewall, and a 15-inch size designation.
Best for: Buyers who need this size and are comparing a 12-ply-rated rib implement tire. Its listed 12-ply rating is higher than the 10-ply rating of the Agstar and Firestone AG Turf options in this selection.
Consider: The provided description does not give a specific load capacity. Use the tire’s full specifications and equipment requirements to determine whether it is suitable for your load.
Firestone AG Turf Implement Plus
The Firestone Regency AG Turf Implement Plus is a 31×13.50-15 bias tire with a 120B rating and 10-ply rating. Its product features state all-season traction, tractor use, one black sidewall, and a 15-inch size designation. The listing identifies it as a turf implement tire.
Best for: Buyers whose equipment or replacement needs call for a product specifically labeled as an AG turf implement tire. It provides a useful comparison with the rib-style options.
Consider: The supplied features do not describe its tread pattern or give a load capacity. Do not assume it is interchangeable with an I-1 rib tire without checking equipment guidance.
MRL MIM 104 Farm Implement I-1
The MRL MIM 104 is listed as a farm implement I-1 tire in size 31×13.50-15. Its specifications include a 124B rating, 12-ply rating, bias construction, all-season traction, and one black sidewall. The product overview identifies it for tractors.
Best for: Buyers seeking an I-1 implement tire with a stated 12-ply rating. It is a direct comparison to the Firestone AG Rib Implement Plus based on size and listed ply rating.
Consider: The supplied product details do not describe casing materials or tube compatibility. Confirm those requirements for the intended wheel and application.
Buying Guide: How to Choose a 31×13.50-15 Implement Tire
Does the tread type match the job?
Start with the tire currently installed and the equipment manufacturer’s guidance. The Harvest King and MRL listings identify I-1 rib implement designs, while the Firestone options are labeled AG Rib and AG Turf. Match the tread category to the work rather than treating every tire with the same dimensions as equivalent.
How should you compare ply ratings?
Three listed tires have 10-ply ratings and 120B ratings: Harvest King, Agstar, and Firestone AG Turf. The Firestone AG Rib and MRL MIM 104 are listed at 12 ply and 124B. These details help narrow comparisons, but they do not replace checking the tire’s load specifications and the equipment’s required capacity.
What else should you verify?
- Confirm the full tire size, wheel diameter, and equipment fitment in the owner’s manual.
- Check load requirements and any required inflation guidance using the tire documentation.
- Verify bias construction and whether a tube is needed; the supplied listings do not provide this information for every tire.
- Consider the stated application, such as tractor use or towed equipment, and select a tread appropriate to the job.
Frequently Asked Questions
What does 31×13.50-15 mean?
It is the tire size shown in the product listings. Confirm that the complete size matches the tire and wheel requirements specified for your equipment.
Are all 31×13.50-15 implement tires interchangeable?
No. Tires can differ in tread type, construction, ply rating, and application. Check your equipment guidance and the full tire specifications before replacing one.
Which tires in this selection have a 12-ply rating?
The Firestone Regency AG Rib Implement Plus and MRL MIM 104 Farm Implement I-1 are both listed with 12-ply ratings and 124B ratings.
Which option is described for wagons and trailers?
The Harvest King Rib Implement I-1 listing specifically names towed equipment such as wagons, spreaders, and trailers.
Does a 10-ply tire always have a lower suitable load than a 12-ply tire?
Do not determine suitability from ply rating alone. Compare the tire’s documented load specifications with the equipment manufacturer’s requirements.