Our readers keep the lights on and my morning glass full of iced black tea. As an Amazon Associate, I earn from qualifying purchases.
Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
Your truck needs a 37-inch tire that fits the rim, grips the terrain you actually drive, and does not howl so loud you can’t hear the radio. This guide compares seven of the best 37×13.50R20 tires side by side, using the manufacturer’s published specs and patterns from real buyer reviews, so you get the real strengths and trade-offs of each one.
I’m Min, the writer behind Gadgets Feed. This guide is built from the specs the brands publish and the patterns that come up again and again in verified customer reviews. No marketing spin, just what each tire actually does.
The right set of 37×13.50r20 tires decides how your truck rides, handles, and stops — whether you daily it, crawl rocks on weekends, or drive through Alaskan winters. This guide helps you pick the rubber that matches your real-world driving.
Quick Picks
- Venom Power Terra Hunter X/T XT All-Terrain Mud Light Truck Radial Tire-37X13.50R20LT — Best Overall
- Cooper Discoverer STT Pro All-Season 37X13.50R20LT 127Q Tire — Premium Off-Road
- BFGoodrich Mud Terrain T/A KM3 Radial Car Tire for Light Trucks, SUVs, 37×13.50R20/E 127Q — Rock Crawler
- Nitto 37X13.50R20LT 127Q E/10 MUD GRAPPLER BW — Heavy Mudder
- Gladiator X Comp A/T All-Terrain Off-Road Light Truck Radial Tire-37X13.50R20LT — Best Value All-Terrain
- General Tire Grabber X3 All-Terrain Radial Tire – 37X13.50R20/10 127Q — Wet Road Specialist
- Milestar Patagonia M/T Mud Terrain LT37X13.50R20 127Q E Light Truck Tire — Quiet Mudder
How To Choose The Best 37×13.50R20 Tires
Every 37×13.50R20 tire on this list fits a 20-inch rim and stands about 37 inches tall. But differences in weight, tread pattern, and ply rating change everything about how it drives.
Tread Type: Mud-Terrain vs All-Terrain
Mud-terrain (M/T) tires use deep, spaced lugs that dig into soft ground, which means they hum on pavement. All-terrain (A/T) tires use a tighter tread pattern so you get quieter highway miles and longer wear, though you lose some bite in deep mud. Decide where you drive most: dirt or asphalt.
Load Range and Ply Rating
All tires here are Load Range E with a 10-ply rating. That means the sidewalls are built thick enough to handle heavy trucks and high air pressures without bulging. Your tire’s load index — 127 in every case here — tells you the maximum weight it can carry, about 3,860 pounds per tire. This is critical for full-size trucks and SUVs carrying heavy loads.
Weight and Balance
A heavier tire like the Nitto Mud Grappler at 87.66 pounds puts more unsprung weight (weight not supported by your suspension) on your rig and can need extra wheel weights to balance. Lighter options like the Venom Power Terra Hunter at 69 pounds are easier on your suspension and typically balance with less fuss — at 69 pounds versus the heaviest option at 87.66 pounds.
Quick Comparison
| Model | Best For | Weight | Load Capacity | Tread Type | Amazon |
|---|---|---|---|---|---|
| Venom Power Terra Hunter X/T | Balanced all-around performer | 69 lbs | 3,858 lbs | Extreme Terrain | from $207.06Amazon |
| Cooper Discoverer STT Pro | Premium off-road traction | 84.1 lbs | 3,860 lbs | All-Season Off-Road | $576.99Amazon |
| BFGoodrich Mud Terrain T/A KM3 | Serious rock crawling | 82.4 lbs | 3,860 lbs | Mud-Terrain | $608.99Amazon |
| Nitto Mud Grappler | Extreme mud traction | 87.66 lbs | — | Mud-Terrain | $631.00Amazon |
| Gladiator X Comp A/T | Budget all-terrain work | 73 lbs | 3,858 lbs | All-Terrain | $326.99Amazon |
| General Tire Grabber X3 | Wet-road stability | 72.1 lbs | 3,860 lbs | All-Terrain | $816.44Amazon |
| Milestar Patagonia M/T | Quiet mud-terrain | 81 lbs | — | Mud-Terrain | $303.08$340.95Amazon |
In-Depth Reviews
1. Venom Power Terra Hunter X/T XT All-Terrain Mud Light Truck Radial Tire-37X13.50R20LT
The featherweight that claws through Alaska snow without the usual drone.
You get easier steering and less strain on your suspension because this is the lightest tire in the lineup at just 69 pounds — at 69 pounds versus the Nitto Mud Grappler at 87.66 pounds. Buyers report “excellent snow performance in interior Alaska on lifted Tacoma” with no issues in deep snow, and the 50,000-mile treadlife rating gives you a clear mileage target for replacement. It carries a 3,858-pound load capacity with a Load Range E 10-ply rating, matching the BFGoodrich KM3 within a rounding error for heavy truck duty.
The extreme-terrain tread is noticeably quieter than a full mud-terrain pattern. But multiple owners mention a “slight vibration at high speeds,” and the softer compound may not reach that full 50,000 miles in aggressive off-road use. One reviewer on a Chevy Silverado 3500 noted the sidewalls sit close together on a dually, with only a 3/8 to 1/2-inch gap, so check rear fitment before you buy.
Why it wins
- Lightest option at 69 lbs reduces unsprung weight for better ride and balancing
- Excellent snow traction, even in deep Alaskan conditions according to buyers
- 50,000-mile treadlife rating for budgeting
The trade-offs
- Soft compound may not hit the rated 50,000 miles off-road
- Rear sidewalls sit very close on dual-rear-wheel trucks
- Some weight needed to balance initially
Reach for this if: you want a light, quiet extreme-terrain tire that handles snow year-round without fighting the steering wheel.
Look elsewhere if: you run a dually and need maximum sidewall clearance, or if you hammer through sharp rocks every weekend.
2. Cooper Discoverer STT Pro All-Season 37X13.50R20LT 127Q Tire
The hybrid that claws through Rausch Creek rocks while keeping highway manners.
You get sidewall toughness that owners mention lasts — one reviewer reports the tread “still looks the same the day I bought them” after 10,000 miles. That is because of Cooper’s Armor Tek3 construction, which reinforces the sidewall and tread area. It shares the same 3,860-pound load capacity as the BFGoodrich KM3, but at 84.1 pounds versus the BFGoodrich KM3’s 82.4 pounds, giving it a denser feel on gravel roads that one reviewer says “holds up well” even while it “picks up and slings rocks on gravel.”
The stone-retention tread design helps prevent pebbles from lodging in the grooves, a real annoyance with looser all-terrain patterns. Customers note it is “louder than Ridge Grapplers” but still quieter than a pure mud-terrain, with good wet pavement handling and no measurable MPG loss. The 36.85-inch actual diameter is slightly under the nominal 37 inches — a half-inch shorter than some competitors — which can affect speedometer calibration if you are picky about rolling diameter.
The durable workhorse: If you regularly mix highway miles with technical off-road trails, the STT Pro’s tread life and stone-shedding design make it a strong long-term play — just expect some rock noise on loose gravel.
Best for: the weekend warrior who drives 50 highway miles to a trail and needs the tire to last several seasons of rocks and mud.
skip it if: you run gravel roads daily and hate hearing stones hit your fender liners.
3. BFGoodrich Mud Terrain T/A KM3 Radial Car Tire for Light Trucks, SUVs, 37×13.50R20/E 127Q
The quietest mud-terrain tire in the class, with Krawl-TEK rock grip that delivers.
You get a cabin that is noticeably quieter than other mud-terrain tires. Multiple reviewers point out it is “the quietest tire ever” for an aggressive mud-terrain, with one reviewer on a GMC 2500HD Duramax noting “the ride quality feels like I put super soft shocks on.” The 3,860-pound load capacity matches the Cooper STT Pro, but at 82.4 pounds versus the Cooper STT Pro’s 84.1 pounds, so daily steering feels a touch lighter. BFGoodrich’s Krawl-TEK technology claims 8 percent better rock traction than previous KM2 models, and the Terrain-Attack tread pattern uses large tread blocks designed to grip from any angle in soft soil. Race-proven sidewall technology adds thickness in the critical failure zone to prevent punctures, and the 6-year standard limited warranty gives you a longer safety net than most competitors offer. The actual rolling diameter is 36.5 inches — a half-inch shorter than the nominal 37 — so factor that into speedometer adjustments.
Premium rock crawler: If you spend weekends on granite slabs and want a mud-terrain that does not punish your ears on the drive home, the KM3 is the benchmark — just accept the higher entry cost and slightly shorter actual diameter.
Reach for this if: rock crawling is your primary off-road activity and you need a quiet highway ride to get there and back.
Look elsewhere if: you need maximum rolling diameter (36.5 actual inches may matter for clearance or gearing) or if budget is the main constraint.
4. Nitto 37X13.50R20LT 127Q E/10 MUD GRAPPLER BW
The 87.66-pound gorilla that does not care about mud, only traction.
The trade-off is exceptional off-road traction from the massive, scooped tread blocks designed to grab and clear sticky mud. With a maximum pressure of 65 PSI, it can handle heavy loads despite the unlisted load capacity in the provided data, though the Load Index of 127 matches the category standard. The Mud Grappler is not a quiet tire — it is a dedicated mud terrain for buyers who prioritize bite over refinement. Made in Japan, it carries a manufacturer warranty, though the import origin can mean longer lead times if stock runs low. The 37x14x37-inch package dimensions mean it is a wide tire, so confirm rear suspension clearance before mounting, especially on lifted trucks with limited wheel well space.
Pure mud weapon: The Nitto is not trying to be a daily-driver compromise. If your driving is 80 percent off-road slop and you have the suspension and gearing to handle the weight, it delivers the traction that matters. For highway commuters, the weight and noise will wear you out fast.
Best for: the dedicated off-roader who needs maximum mud clearing and does not care about highway noise or fuel economy.
pass on it if: you daily your truck or have a stock suspension that will sag under the extra 87.66 pounds per corner.
5. Gladiator X Comp A/T All-Terrain Off-Road Light Truck Radial Tire-37X13.50R20LT
Budget-friendly all-terrain that rides smooth and comes with Raised White Letters.
You pay less for a smooth ride according to multiple buyers. At 73 pounds, the Gladiator X Comp A/T splits the difference between the lightweight Venom Power (69 lbs) and the heavier Cooper STT Pro (84.1 lbs). One owner in Kansas reported “no issues with slick and packed snow” during the first snowfall, and the reversible sidewall gives you the option of Raised White Letters (RWL) on one side or a clean black wall on the other — a styling bonus that is rare at this price tier.
The all-weather all-terrain tread carries a 3,858-pound load capacity with a Load Range E 10-ply rating, matching the Venom Power Terra Hunter pound-for-pound. The 50,000-mile treadlife rating is the same as the Venom Power, giving you a solid mileage target. Buyers mention the tire arrived quickly and “rides very smoothly” right after installation, with one reviewer calling it “super affordable” — though long-term durability data beyond a few months is not yet available in the reviews.
The value play
- Smooth ride with minimal road noise for an all-terrain
- Reversible white/black lettering for custom styling
- 50,000-mile treadlife at a budget-friendly entry point
The unknowns
- Limited long-term reviews past the first few months
- Untested in extreme rock-crawling or deep mud
Reach for this if: you want a quiet, smooth-riding all-terrain with white lettering on a budget — especially for mixed highway and light off-road use.
Look elsewhere if: you need a proven track record in extreme rock or mud conditions, or if you prefer an all-black sidewall.
6. General Tire Grabber X3 All-Terrain Radial Tire – 37X13.50R20/10 127Q
Long lateral grooves fight hydroplaning so you stay stable in the rain.
You get a specific engineering advantage in wet conditions: deep tread with a long lateral groove (a channel running sideways) that is designed to reduce hydroplaning risk — when a layer of water lifts the tire off the road. At 72.1 pounds, it is the third-lightest tire here, at 72.1 pounds versus the Gladiator X Comp A/T’s 73 pounds, so the impact on fuel economy and acceleration is smaller than with heavier mud tires. The 3,860-pound load capacity ties it with the BFGoodrich KM3 and Cooper STT Pro for the top rating, and built-in treadwear indicators help you know when to rotate or replace without guessing. Buyers call it “one of my favorite tires for the looks and performance,” with one owner noting they have “never been stuck any snow or winter conditions.” A 45-day manufacturer warranty is shorter than the industry average, so check your coverage expectations. Note that the product is not for sale in Arkansas, so verify availability in your state.
Wet-road specialist: If you drive a lot in rain or snow and want a tire that prioritizes hydroplaning resistance over mud-slinging, the Grabber X3’s shallow lateral grooves are a real safety advantage on pavement.
Best for: drivers in rainy climates who need stable highway handling and occasional winter snow traction without aggressive mud-terrain noise.
it’s not for you if: you are an Arkansas resident (not available there) or if you want a tire that comes with red lettering — the listing image shows red but sends black letters.
7. Milestar Patagonia M/T Mud Terrain LT37X13.50R20 127Q E Light Truck Tire
A mud-terrain that lets you hold a conversation at 70 mph — surprisingly quiet.
You get the aggressive look of a mud-terrain (M/T) tire without the typical roar. Shoppers say a “smoother, quieter ride than Nitto’s” with highway comfort good enough that “conversation possible at 70 mph” — a rare claim for a tire with this aggressive tread pattern. At 81 pounds, it splits the difference between the Cooper STT Pro (84.1 lbs) and the BFGoodrich KM3 (82.4 lbs), so it is noticeable on the scales but not the heaviest option. The Load Range E 10-ply construction matches the class standard, though the load capacity figure is not listed in the provided data. Buyers on lifted Tacomas and similar mid-size trucks report great on- and off-road performance with “hardly any hum like mud tires normally do.” The downside is that long-term wear data is sparse in the reviews, and the 37-inch nominal diameter may vary slightly from actual rolling measurements.
Why it surprises
- Remarkably quiet for a mud-terrain tire — conversation-friendly at highway speeds
- Aggressive tread pattern for off-road grip without the typical roar
- Budget-friendly entry into 37-inch mud-terrain territory
The catches
- Limited long-term tread life data from owner reviews
- Heavier than all-terrain options, impacting fuel economy
Reach for this if: you want the visual impact of a mud-terrain but cannot tolerate the cabin drone that usually comes with it — and you run a tight budget.
Look elsewhere if: you need a proven 50,000-mile treadlife warranty or if you push your truck through extremely sharp rocks where sidewall toughness is critical.
Understanding the Specs
Load Range E (10-Ply)
Every tire on this list is Load Range E with a 10-ply rating. This means the sidewall is built thick enough to handle the weight of a heavy-duty truck or SUV, and you can inflate it to higher pressures — up to 65 PSI on the Nitto Mud Grappler — without risking a blowout. For a 37-inch tire on a full-size rig, Load Range E is the standard; anything less would bulge under the load.
Load Index 127 (3,858-3,860 lbs)
The load index number tells you the maximum weight one tire can carry at full inflation pressure. An index of 127 means roughly 3,860 pounds per tire. Multiply that by four tires, and your truck can theoretically support over 15,000 pounds of combined weight — well beyond what even a one-ton truck weighs fully loaded. Always match or exceed your vehicle’s original load index when upsizing tires.
FAQ
Will 37×13.50R20 tires fit my stock truck?
What wheel width do I need for a 37×13.50R20 tire?
How does tire weight affect my truck’s performance?
What is the difference between mud-terrain (M/T) and all-terrain (A/T) tread?
How long should a set of 37×13.50R20 tires last?
Are mud-terrain tires safe in the snow?
What does the “Q” in the speed rating (127Q) mean?
Do I need to recalibrate my speedometer for 37-inch tires?
Why is the actual tire diameter different from the nominal 37 inches?
Can I mix different tire brands on my truck?
Final Thoughts: The Verdict
For most buyers, the 37×13.50r20 tires winner is the Venom Power Terra Hunter X/T because it delivers the lightest weight, 50,000-mile treadlife, and proven snow traction — making it the best all-round pick for daily drivers and overlanders alike. If you want a quiet mud-terrain that does not scream at highway speeds, grab the Milestar Patagonia M/T. And for serious rock crawling with 3,860-pound load capacity and the quietest cabin in the mud-terrain class, the BFGoodrich Mud Terrain T/A KM3 is the standout.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, Gadgets Feed earns from qualifying purchases. This does not affect which products we feature.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product. As an Amazon Associate I earn from qualifying purchases.
CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED "AS IS" AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
Amazon and the Amazon logo are trademarks of Amazon.com, Inc. or its affiliates.