The best 31×15.50-15 tire depends on whether you need tractor traction, a trencher tire, or a lawn-and-garden replacement. The Forerunner QH645 is a 12-ply-rated option for tractor use, while its QH645 I-3 pair is specifically listed for trenchers and provides load and mounting details. BKT and Carlisle offer other tires in this size, and the Galaxy Hippo II is another farm-tire option. Check tread type, quantity, rim fit, and equipment requirements before choosing.
| Product | Best For | Notable Detail |
|---|---|---|
| Forerunner QH645 | Tractor buyers needing one tire | 12-ply rated, bias construction |
| Forerunner QH645 I-3 Pair | Trencher equipment | Pair; 3,300-pound listed load capacity per tire |
| BKT Trac Master | Buyers considering a farm tire | 31×15.50-15, 8-ply listing |
| Carlisle Tru Power | Lawn and garden equipment | 8-ply; tire only |
| Galaxy Hippo II R-4 | Farm equipment buyers comparing R-4 tires | Farm tire in the requested size |
Forerunner QH645 12-Ply Bias Tire
This Forerunner QH645 is a 31×15.50-15, 12-ply-rated bias tire described for tractors. Its listed features include all-season traction and a black sidewall. It is the best fit for a buyer replacing one tractor tire who wants the specified size and a 12-ply rating.
Choose this if you need a single tire and the equipment manufacturer’s requirements match its size and construction. The listing does not provide a load capacity or tread pattern description, so verify those requirements before ordering.
Forerunner QH645 I-3 Trencher Pair
This listing is for two tubeless I-3 trencher tires in size 31×15.5-15. It lists a 3,300-pound load capacity per tire, a maximum inflation pressure of 65 PSI, 22/32-inch tread depth, and mounting on 15×13 rims. The listing gives overall dimensions of 29.25 inches high and 15 inches wide including the rim guard.
Best for buyers replacing a matching trencher tire pair who can confirm the required rim size and machine fit. The product information names a range of heavy-equipment makes, but buyers should still confirm compatibility with their specific model. Avoid assuming the listed dimensions guarantee fit.
BKT Trac Master 8-Ply Tire
The BKT Trac Master is listed as a 31×15.50-15 D/8-ply tire. It is a single tire, and the supplied product details include package dimensions and weight rather than a tread description or load rating. It is best for buyers who have identified the Trac Master as a suitable pattern for their equipment and need this particular size.
Check before buying: the available information does not specify load capacity, rim details, or intended machine type. Confirm those points against your equipment requirements rather than relying on the package measurements alone.
Carlisle Tru Power Lawn And Garden Tire
The Carlisle Tru Power is a 31×15.50-15, 8-ply tire identified for lawn and garden use. The listing specifies that it is a tire only and that the rim is not included. It is best for a buyer whose lawn or garden equipment calls for this size and tire type and who already has a compatible rim.
Limitation: this listing does not include a wheel, and the supplied features do not state load capacity or a specific tread description. Check both details before deciding whether it meets the machine’s needs.
Galaxy Hippo II R-4 Farm Tire
The Galaxy Hippo II is identified as an R-4 farm tire in size 31/15.50-15. It is a candidate for buyers seeking a farm tire in this size and comparing R-4 options. The provided listing details include package dimensions and a package weight of 35 pounds, but do not describe tread performance or load capacity.
Best for equipment owners who have confirmed that an R-4 tire is appropriate for their application. Because the available features are limited, verify the tire’s specifications and fit before ordering.
Buying Guide: How To Choose A 31×15.50-15 Tire
What kind of equipment will use the tire?
Start with the equipment’s manual or existing tire specifications. These products are not interchangeable just because they share a size. The listings identify different applications, including tractors, trenchers, farm equipment, and lawn-and-garden equipment. Match intended use and tread style to the machine’s requirements.
Do you need one tire or a pair?
Confirm the quantity in the listing. The standard Forerunner QH645 and the BKT and Carlisle listings describe a tire, while the Forerunner I-3 listing is a pair. Buying a pair may suit an axle replacement, but the required quantity depends on the equipment and its maintenance guidance.
How should you compare ply rating and load information?
Use the rating and load details that are actually listed, and compare them with the machine’s specifications. The QH645 is described as 12-ply rated; the BKT and Carlisle are listed as 8-ply. The trencher pair listing specifies a 3,300-pound capacity per tire and a maximum pressure of 65 PSI. Do not assume one tire’s rating applies to another.
What should you verify before ordering?
Check the complete size, rim dimensions, tube or tubeless construction, tire quantity, and whether a wheel is included. The Carlisle listing explicitly says the rim is not included. The trencher listing specifies 15×13 rims and tubeless construction. Confirm these details with the seller and your equipment documentation when the listing does not provide them.
Frequently Asked Questions
Are 31×15.50-15 and 31×15.5-15 the same size notation?
They use equivalent decimal notation for the width: 15.50 and 15.5. Still, confirm the full tire and rim specifications before purchasing.
Does every 31×15.50-15 tire fit every tractor?
No. Size alone does not establish fit. Check the equipment’s required tire type, rim, load capacity, and clearance.
Does the Carlisle listing include a rim?
No. The product details identify it as a tire only and state that the rim is not included.
Which listed tire is specifically described for trenchers?
The Forerunner QH645 I-3 pair is identified as trencher tires. Its listing also provides rim, pressure, and load information.
Is the Galaxy Hippo II listing detailed enough to confirm fit?
Not by itself. The supplied information identifies the size and R-4 farm-tire type, but does not provide load capacity or machine-specific fit details.