By the Rims & Tires Team
Compiled & reviewed by our West Georgia tire & wheel research team · Updated 2026-07-24
37-inch tires are the territory of serious lifted builds. Unlike 33 and 35-inch tires that work with moderate lifts, 37s require 4-6 inches of lift on most trucks and 4+ inches on Jeep Wranglers. The payoff is significantly increased off-road ground clearance and the visual impact of a fully built truck. The common 37-inch sizes are 37x12.50R17 and 37x13.50R17.
37-Inch Tire Sizes
37x12.50R17: 12.5 inches (318mm) wide, 37 inches tall on a 17-inch wheel. The standard 37-inch size, aggressive appearance with manageable fitment on most lifted half-tons.
37x13.50R17: 13.5 inches (343mm) wide, 37 inches tall. The wide 37 requires more fender clearance and is common on Jeep builds where width is desirable for rock crawling stability.
37x12.50R18: same diameter and width on an 18-inch wheel. Growing in popularity for builds that use 18-inch wheels rather than the off-road standard 17-inch.
Metric equivalent: 315/70R17 measures about 34.4 inches, not 37. A true 37-inch metric equivalent would be approximately 325/75R17 (37.1 inches), but the flotation 37x12.50R17 is the primary size.
Lift Requirements for 37-Inch Tires
Jeep Wrangler (JK): minimum 4 inches, typical 4-6 inches for 37x12.50R17. Some JKs run 37s on 3.5-inch lifts with aggressive fender trimming.
Jeep Wrangler (JL): 3.5 to 4 inches minimum — the JL has slightly better clearance than the JK and can fit 37s with a quality 3.5-inch long-arm kit.
Chevy Silverado/GMC Sierra 1500: 6 inches minimum for most configurations. Some owners run 37s on 5 inches with precise offset selection and trimming.
Ford F-150: 6 inches for clean 37-inch fitment. Some builds achieve it with 5 inches and trimming.
Toyota Tacoma (3rd gen): 4-6 inches. The Tacoma's narrower wheel well makes 37-inch fitment more challenging than on full-size trucks.
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Best 37-Inch Tires
BFGoodrich All-Terrain T/A KO2 in 37x12.50R17: available in 37-inch size, and the KO2 remains competitive here for dual-use builds. Long tread life, 3PMSF winter rating, proven trail performance.
Nitto Trail Grappler M/T in 37x12.50R17: one of the most popular M/Ts in the 37-inch class. Aggressive appearance, strong rock and mud performance, and more manageable highway noise than older M/T designs.
BFGoodrich Mud-Terrain T/A KM3 in 37x12.50R17: the premium mud-terrain choice for serious off-road builds. Excellent side-bite and cut resistance; the KM3's Krawl-TEK compound resists sidewall damage in rocky terrain.
Falken Wildpeak A/T3W in 37x12.50R17: available in 37-inch and a strong all-terrain choice for builds that see regular pavement with occasional serious off-road.
Toyo Open Country M/T in 37x12.50R17 and 37x13.50R17: available in both 37-inch widths. Strong rock-crawling shoulder design and reasonable highway manners for an M/T.
Frequently asked
What is the minimum lift for 37-inch tires?
Jeep Wrangler JL: 3.5 to 4 inches. Jeep Wrangler JK: 4 inches. Silverado/Sierra/F-150: 5-6 inches. Toyota Tacoma: 4-6 inches. Running 37s with insufficient lift will cause rubbing on suspension components and fenders at full lock and full compression.
Do 37-inch tires hurt fuel economy significantly?
Yes — significantly more than 33 or 35-inch tires. The additional rolling resistance, rotating mass, and aerodynamic drag from 37-inch M/T tires reduces fuel economy by 3-5 mpg on most trucks. Gear re-gearing is recommended with 37-inch tires on most truck platforms.
Do I need to re-gear my truck for 37-inch tires?
Strongly recommended. Stock axle gearing (e.g. 3.73:1 or 3.92:1) on most half-tons is designed for stock-size tires. Going to 37-inch tires requires 4.56:1 or 4.88:1 gearing to maintain performance and avoid excessive drivetrain stress. Without re-gearing, the truck will accelerate slowly and the transmission will downshift excessively.
Are 37-inch tires loud on the highway?
It depends on the tread. A 37-inch all-terrain is a manageable hum for most drivers, but a 37-inch mud-terrain is genuinely loud and you'll hear it on every drive. If your build sees a lot of pavement, an aggressive A/T or a hybrid tire keeps the noise livable while still looking the part.
How long do 37-inch tires last?
Fewer miles than a highway tire, as a rule. The aggressive tread and heavy build wear faster, and mud-terrains wear fastest of all. How much pavement versus trail you run matters more than the brand, and regular rotation helps. A shop set up for lifted builds can also check that your alignment isn't quietly eating the tread.
Keep reading
Last updated 2026-07-24. General guidance only — confirm specifics with a local shop for your exact vehicle.