37x11.50-17 Tire Size

All You Need to Know About 37x11.50-17 Tires

A 37x11.50-17 is a tall, narrow flotation tire with an approximate 37-inch overall diameter and an 11.5-inch section width on a 17-inch wheel. The hyphenated notation (-) does not explicitly designate radial construction. This exact size in bias-ply or specialty non-radial form is rare in current commercial catalogs. Most 37-inch tires at the 11.50-inch width are produced and sold as 37X11.50R17 radials. Buyers searching this hyphenated size should verify current product availability before building fitment plans around it.

For vehicles requiring confirmed radial construction in this diameter and width, see the 37X11.50R17 article.

37x11.50-17 Size Quick Specs

Sidewall height calculation: (37 − 17) ÷ 2 = 10.0 inches.

What 37x11.50-17 Means

• 37 = approximate overall tire diameter in inches
• 11.50 = approximate section width in inches
• 17 = wheel diameter in inches
• No construction letter = construction type not specified

The 37x11.50-17 size notation differs from 37X11.50R17. The radial version carries an explicit "R" on the sidewall and is the format most commonly stocked by tire retailers.

Why 37x11.50-17 Is Different From Most 37-Inch Tires

The 11.50-inch version of the 37x11.50-17 size prioritizes height over tread width; Most 37-inch flotation tires use section widths between 12.50 and 13.50 inches. 

The narrower footprint of the 37x11.50-17 tire reduces steering effort and fender interference, and often improves clearance during steering articulation on narrow-axle trail vehicles.

Ground Clearance vs 33-Inch Tires

Stepping up to 37x11.50-17 from a 33-inch tire adds approximately 2 inches of axle and differential clearance - a ~12% diameter increase that meaningfully improves rock-crawling capability, breakover angle, and obstacle rollover performance. The narrow 11.50-inch width means that clearance gain comes without the fender and steering interference typical of wider 37-inch fitments. Most vehicles still need a minimum 4-inch suspension lift to accommodate the 37x11.50-17 diameter without fender contact; many require more depending on wheel offset and suspension geometry.

Wheel Fitment

The approved rim width for 37x11.50-17 is typically 8.0 to 10.0 inches. Most applications use 17×8.5 or 17×9 wheels. Because the tire is relatively narrow for its height (10-inch sidewall), wheel width selection is more influential than on shorter-sidewall sizes - underly narrow rims increase sidewall instability under lateral load.

What to Check Before Installing 37x11.50-17 Tires

Suspension and clearance requirements: The 37x11.50-17's diameter creates more fitment challenges than its 11.50-inch width. Typical requirements include suspension lift, fender trimming or flaring, bump-stop adjustments, inner fender liner modification, and wheel offset correction.

Axle gearing: Moving to 37x11.50-17 significantly changes the effective drive ratio. On a vehicle originally running 33-inch tires at 4.10:1 axle gears, installing 37x11.50-17 tires produces an effective ratio of approximately 3.65:1 - a ~11% reduction in low-speed torque multiplication. Most dedicated off-road builds re-gear after stepping into the 37x11.50-17 category; 4.56:1 or 4.88:1 gears are common recalibration targets.

Speedometer calibration: The 37x11.50-17 rolls approximately 116.2 inches per revolution versus 103.7 inches for a 33-inch tire - a ~12% difference that causes speedometers calibrated for smaller tires to read low.

37x11.50-17 vs 35x12.50-17

37x11.50-17 provides more ground clearance and rollover capability. 35x12.50-17 offers a wider contact patch and generally requires less suspension modification.

37x11.50-17 Common Applications

• Rock-crawling and competition trail vehicles
• Narrow-track or narrow-axle Jeep Wrangler builds
• Toyota solid-axle conversion projects
• Builders prioritizing tire height over tread contact area