We researched and compared the top 37×13.5R20 tires based on manufacturer specifications, industry standards, and aggregated owner feedback. Our evaluation focuses on performance, durability, value, ease of installation, and safety. Whether you need aggressive off-road traction or a quiet highway ride, this guide helps you find the right tire for your rig.
| Photo | Product | Score | Buy |
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Nitto Trail Grappler M/T Best Overall Load Range E, 3-ply sidewall, 35/32" tread depth |
9.0 | 🛒 Check Price |
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BFGoodrich Mud-Terrain T/A KM3 Best for Extreme Off-Road Load Range E, 3-ply sidewall, 34/32" tread depth |
8.7 | 🛒 Check Price |
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Toyo Open Country M/T Best Value Load Range E, 3-ply sidewall, 33/32" tread depth |
8.4 | 🛒 Check Price |
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Cooper Discoverer STT Pro Best for Durability Load Range E, 3-ply sidewall, Armor-Tek3 construction, 34/32" tread depth |
8.2 | 🛒 Check Price |
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Mickey Thompson Baja Boss M/T Best for Traction Load Range E, 3-ply sidewall, 34/32" tread depth |
8.0 | 🛒 Check Price |
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Firestone Destination M/T2 Best Budget Pick Load Range E, 2-ply sidewall, 32/32" tread depth |
7.8 | 🛒 Check Price |
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GT Radial Adventuro M/T Best for Highway Comfort Load Range E, 2-ply sidewall, 30/32" tread depth |
7.3 | 🛒 Check Price |
1. Nitto Trail Grappler M/T: Best Overall
The Nitto Trail Grappler M/T is a top performer for serious off-roaders. Its aggressive tread design provides outstanding traction in mud, sand, and rocky terrain. The three-ply sidewall adds durability against trail hazards. In our evaluation, owner feedback consistently praises its longevity and grip in challenging conditions.
However, this tire is on the heavier side, which can impact fuel economy and acceleration. It also produces some road noise at highway speeds, though less than many mud-terrain tires. If you mostly drive on pavement with occasional off-road trips, a more all-terrain oriented tire might suit you better. The Trail Grappler is best for those who prioritize off-road capability over on-road comfort.
- Excellent off-road traction with aggressive tread pattern
- Three-ply sidewall for puncture resistance
- Quieter than many mud-terrain tires on highway
Pros: Exceptional off-road grip in mud and rocks; Durable construction resists cuts and punctures
Cons: Heavier than some competitors, affecting fuel economy
2. BFGoodrich Mud-Terrain T/A KM3: Best for Extreme Off-Road
The BFGoodrich KM3 is built for extreme off-road conditions. Its Mud-Phobic bars eject mud quickly, maintaining traction. The CoreGard sidewall armor enhances durability against sharp rocks. We researched owner feedback and found it excels in rock crawling and deep mud.
On the downside, the KM3 is loud on the highway and rides stiffer than all-terrain tires. It also tends to be more expensive per tire. If your daily driving involves long highway stretches, consider a more road-friendly option. This tire is ideal for dedicated off-road enthusiasts who prioritize traction over on-road manners.
- Mud-Phobic bars and tread self-cleaning
- CoreGard technology for sidewall toughness
- Excellent rock crawling traction
Pros: Superior self-cleaning in mud; Strong sidewall resists punctures
Cons: Higher road noise and less comfort on pavement
3. Toyo Open Country M/T: Best Value
The Toyo Open Country M/T offers a compelling mix of off-road capability and on-road civility. It provides reliable traction in moderate off-road conditions while maintaining a quieter ride on pavement. In our evaluation, owners report good tread life and value for the money.
However, in extreme mud or rock crawling, it may not match the grip of more aggressive tires like the KM3 or Trail Grappler. If you frequently tackle severe off-road trails, you might want a more specialized tire. The Toyo M/T is a great choice for those who want a capable off-road tire without sacrificing daily driving comfort.
- Good balance of off-road traction and on-road comfort
- Reinforced sidewall for durability
- Long tread life for a mud-terrain tire
Pros: Competitive price point for the performance; Decent highway ride and noise levels
Cons: Not as aggressive in deep mud as some competitors
4. Cooper Discoverer STT Pro: Best for Durability
The Cooper Discoverer STT Pro is built to withstand the toughest environments. Its Armor-Tek3 construction and deep tread provide exceptional resistance to cuts, chips, and punctures. We researched owner feedback from rock crawlers and off-roaders who praise its durability on sharp trails.
On the road, the STT Pro is noticeably loud and rides harshly. It also weighs more than some competitors, which can affect acceleration and fuel economy. If you rarely venture off-road, this tire’s on-road compromises may not be worth it. It is best suited for those who need maximum durability in extreme off-road conditions.
- Armor-Tek3 casing for extreme durability
- Stone and mud ejectors prevent packing
- Excellent cut and chip resistance
Pros: Very tough sidewall and tread; Long lifespan even in harsh conditions
Cons: Stiff ride and significant road noise
5. Mickey Thompson Baja Boss M/T: Best for Traction
The Mickey Thompson Baja Boss M/T delivers outstanding traction in mud, snow, and rocks. Its aggressive tread and sipe design enhance grip in slippery conditions. In our evaluation, owner reports highlight its performance in deep snow and wet roads, uncommon for a mud-terrain tire.
However, the soft compound that provides excellent traction also leads to faster tread wear. It may not be as durable on rocky trails as some competitors. If you prioritize traction over longevity, this tire is a strong contender. But for those who want a tire that lasts many miles, other options may be better.
- PowerPly XD sidewall technology
- XST (Extreme Sipe Technology) for wet traction
- Aggressive tread with large voids for mud
Pros: Exceptional traction in mud and snow; Good wet road performance for a mud-terrain
Cons: Tread life is shorter than some rivals
6. Firestone Destination M/T2: Best Budget Pick
The Firestone Destination M/T2 offers a budget-friendly entry into 37-inch mud-terrain tires. It provides adequate traction for light off-roading and performs reasonably on pavement. We researched owner feedback and found it a good value for those who don’t need extreme capability.
However, its two-ply sidewall is more susceptible to punctures in rocky terrain. The tread depth is also shallower, which may reduce longevity in severe conditions. If you frequently tackle tough trails, investing in a more solid tire is wise. The Destination M/T2 is best for budget-conscious buyers who use their truck primarily on-road with occasional off-road trips.
- Affordable price for a 37-inch mud-terrain
- Decent off-road traction for light to moderate use
- Reinforced tread area for chip resistance
Pros: Very competitive price point; Satisfactory performance for occasional off-road
Cons: Sidewall is less durable than 3-ply competitors
7. GT Radial Adventuro M/T: Best for Highway Comfort
The GT Radial Adventuro M/T is designed with on-road comfort in mind. It produces less noise and vibration than typical mud-terrain tires, making it suitable for daily driving. In our evaluation, owners appreciate its highway manners and value pricing.
However, its off-road capability is limited. The shallower tread and two-ply sidewall mean it struggles in deep mud and rocky trails. If you need a tire for serious off-roading, look elsewhere. This tire is best for drivers who want the aggressive look of a mud-terrain but spend most of their time on pavement.
- Quieter ride than many mud-terrain tires
- Good straight-line stability on highway
- Affordable price
Pros: Low road noise for a mud-terrain; Smooth highway ride
Cons: Limited off-road traction in deep mud or rocks
Frequently Asked Questions
What does 37×13.5R20 mean?
37 is the tire diameter in inches, 13.5 is the section width in inches, and R20 means it fits a 20-inch wheel rim. This is a large, wide tire commonly used on lifted trucks and SUVs for off-road performance.
Can I use 37×13.5R20 tires on a stock truck?
Most stock trucks cannot accommodate 37-inch tires without modifications. You typically need a suspension lift, leveling kit, and possibly trimming of fenders or bumpers to avoid rubbing. Always check fitment with your vehicle’s specifications.
What load range should I choose for 37×13.5R20 tires?
Most 37×13.5R20 tires come in Load Range E, which supports heavy loads and higher air pressures. This is suitable for heavy trucks and towing. Always match the load range to your vehicle’s requirements and never exceed the tire’s maximum load.
How long do 37×13.5R20 mud-terrain tires last?
Tread life varies by brand and driving conditions. On average, mud-terrain tires last 30,000 to 50,000 miles. Aggressive off-road use, heavy loads, and improper inflation can significantly reduce lifespan. Rotating tires regularly helps extend wear.
Are 37×13.5R20 tires good for daily driving?
They can be used for daily driving, but expect increased road noise, stiffer ride, and reduced fuel economy compared to all-terrain tires. Some models, like the GT Radial Adventuro M/T, are more highway-friendly. Consider your driving needs before choosing.
Our Verdict
After researching and comparing the best 37×13.5R20 tires, we recommend the Nitto Trail Grappler M/T as the top pick for its balanced off-road performance and on-road manners. For a more budget-friendly option that still offers good capability, the Toyo Open Country M/T is an excellent runner up.
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