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All You Need To Know About LT255/65R17 Tire Size

LT255/65R17 has a 255 mm section width, a 65% aspect ratio, fits a 17-inch wheel, and calculates to approximately 30.1 inches in overall diameter with a 6.5-inch sidewall. The 65 aspect ratio gives LT255/65R17 a nominal sidewall height of 165.8 mm. A 255/65R17 version also exists with the same nominal dimensions, but LT255/65R17 follows Light Truck sizing and load/inflation standards, so the two designations should not be treated as automatically interchangeable; see our LT tire guide for the relevant differences.

LT255/65R17 Size Quick Specs

Vehicles That Use LT255/65R17 Tires

LT255/65R17 is documented as an aftermarket replacement fitment for specific Ford Ranger and Chevrolet Colorado configurations whose referenced original tire size is 255/65R17 rather than LT255/65R17. The LT255/65R17 designation therefore should not be interpreted as the factory/OE designation for the applications below.

• Ford Ranger
• Chevrolet Colorado

LT255/65R17 aftermarket fitment still requires confirmation of the wheel width, required tire load capacity and inflation pressure, tire clearance, and the vehicle manufacturer's requirements before installation.

LT255/65R17 Dimensions in Inches

The LT255/65R17 tire size is approximately 10.0 inches wide, 30.1 inches tall overall, with a sidewall approximately 6.5 inches high. LT255/65R17 uses a 17-inch wheel, while its overall diameter represents the approximate complete unloaded tire height.

LT255/65R17 in Inches: All Measurements

• Overall Diameter: Approx. 30.1 inches
• Section Width: Approx. 10.0 inches
• Sidewall Height: Approx. 6.5 inches
• Wheel Diameter: 17 inches
• Circumference: Approx. 94.4 inches

LT255/65R17 Alternative Tire Sizes

LT255/65R17 is commonly compared with LT265/65R17 and LT255/70R17 when evaluating nearby 17-inch LT tire sizes. LT265/65R17 is 10 mm wider and slightly taller than LT255/65R17, while LT255/70R17 keeps the same nominal width but adds sidewall height and overall diameter. LT265/65R17 remains relatively close in overall diameter, while LT255/70R17 falls outside the commonly used ±3% diameter guideline. Dimensional comparison alone does not establish interchangeability; the ±3% guideline is only a starting point when comparing tire sizes.

LT255/65R17 vs LT265/65R17

LT265/65R17 is approximately 1.70% larger in overall diameter than LT255/65R17, so the difference is within the commonly used ±3% diameter guideline.

• Width Difference: LT265/65R17 is 10 mm wider than LT255/65R17.
• Diameter Difference: LT265/65R17 is approximately 0.5 inches larger in overall diameter than LT255/65R17, a difference of 1.70%.
• Interchangeability: The 1.70% diameter difference between LT265/65R17 and LT255/65R17 falls within the commonly used ±3% guideline, making interchangeability possible. Wheel width, load capacity, clearance, and vehicle requirements must still be checked.
• Practical Difference: LT265/65R17 adds 10 mm of nominal section width and approximately 0.5 inches of overall diameter compared with LT255/65R17.

LT255/65R17 vs LT255/70R17

LT255/70R17 is approximately 3.34% larger in overall diameter than LT255/65R17, so the difference falls outside the commonly used ±3% diameter guideline.

• Width Difference: LT255/70R17 and LT255/65R17 have the same nominal 255 mm section width.
• Diameter Difference: LT255/70R17 is approximately 1.0 inch larger in overall diameter than LT255/65R17, a difference of 3.34%.
• Interchangeability: LT255/70R17 falls outside the commonly used ±3% guideline and is generally not recommended as a direct size swap for LT255/65R17. A larger diameter change can affect speedometer accuracy, vehicle clearance, and vehicle systems calibrated around the original tire diameter. LT265/65R17 is a closer size to compare with LT255/65R17, with an overall-diameter difference of 1.70%, which remains within the ±3% guideline.
• Practical Difference: LT255/70R17 keeps the same nominal width as LT255/65R17 but increases sidewall height by approximately 0.5 inches per side, producing approximately 1.0 inch more overall tire diameter.