255/75R17 Tire Size

All You Need to Know About 255/75R17 Tires

255/75R17 tires are 255 mm wide, with a 75% aspect ratio and a 17-inch wheel diameter, producing an overall height of about 32.1 inches and a sidewall height of 7.53 inches. The 255/75R17 size sits in the 32-inch class, where overall height and sidewall depth directly influence ground clearance, load distribution, and ride behavior.

The 255/75R17 size may appear in different constructions, such as P255/75R17 and LT255/75R17. While dimensions remain identical, load capacity, pressure limits, and intended use vary significantly between them.

Compared to a slightly smaller size, such as 255/70R17, the 255/75R17 adds noticeable height. That increase raises vehicle stance, reduces revolutions per mile, and changes how drivetrain systems interpret speed and distance.

255/75R17 Size Quick Specs

• Approved rim width range: 6.5–8.5"
• Best rim width fit: 7.0"-8.0"
• Width: 255 mm
• Sidewall height: 191.25 mm
• Overall height: 32.1"
• Wheel diameter: 17 in

Note: The calculated overall diameter of 255/75R17 is ≈32.1 inches. A small variation may occur depending on tread depth, tire type and casing design.

255/75R17 Common Vehicle Fitment

255/75R17 is commonly used on trucks and SUVs where increased ground clearance and sidewall height are required for durability and off-road use.

• Jeep Wrangler ((2007-2018 JK & later JL)); Gladiator; Rubicon; 
• Toyota Tacoma
• Ford Ranger; 
• Bronco (2021-2026): Often fitted to lower or mid-range trims for a balanced, capable footprint.
• Nissan Frontier
• Dodge Dakota & Toyota 4Runner

Because the 255/75R17 size exceeds many factory diameters, clearance and suspension travel must be verified before installation.

255/75R17 Dimensions in Inches

The 255/75R17 tire size is about 10.0 inches wide, 32.1 inches tall, and has a sidewall height of approximately 7.53 inches.

The defining characteristic of the 255/75R17 size is its 7.53-inch sidewall, which allows measurable deformation under load. That deflection range enables the tire to absorb larger surface inputs and conform more closely to irregular terrain at low speed, though the same compliance that aids off-road contact reduces tread stability during hard cornering and braking on paved surfaces.

255/75R17 in Inches: All Measurements

• Total height: ≈32.1"
• Width: 10.04"
• Sidewall height: 7.53"
• Wheel diameter: 17"
• Circumference: ≈100.7"

Comparison of 255/75R17 With Similar Tire Sizes

Drivers cross-shopping 255/75R17 most often land on one of two alternatives - 255/70R17 for a shorter profile within the same width, or 265/75R17 for added section width at a similar height. One sits just outside the interchangeability boundary; the other is a viable substitute where clearance allows.

255/75R17 vs 255/70R17

• Width: identical at 255 mm
• Overall diameter: 255/75R17 is ≈1.0 inch (≈3.2%) larger than 255/70R17

That 3.2% diameter gap between 255/75R17 and 255/70R17 edges past the ±3% threshold - not by a wide margin, but enough that direct substitution cannot be assumed. On a truck or SUV where ride height, ground clearance, and towing calibration are actively managed, even a marginal diameter breach affects rotational frequency, speedometer accuracy, and effective gearing in ways that compound over distance. Whether the vehicle's tolerance accommodates this gap requires case-by-case verification rather than a blanket clearance.

255/75R17 vs 265/75R17

• Width: 265/75R17 is 10 mm wider
• Overall diameter: 265/75R17 is ≈0.6 inches (≈1.9%) larger than 255/75R17

At 1.9%, the diameter difference between 265/75R17 and 255/75R17 sits comfortably within range - drivetrain calibration and speedometer behavior are minimally affected. The decision here comes down to width. The additional 10 mm expands the contact patch and increases lateral load capacity, but it also tightens available clearance at inner suspension components and the fender edge, and may push the tire outside the approved rim width range for the existing wheel. On a truck running near its load limits, those clearance checks matter more under compression than they do in a static fitment inspection.

Consider understanding how to change tire size safely: 3% rule if switching to or from a 255/75/R17 tire size.