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All You Need To Know About LT255/80R17 Tire Size

LT255/80R17 has a 255 mm section width, an 80% aspect ratio, a 17-inch wheel diameter, an approximate 33.1-inch overall diameter, and an approximate 8.0-inch sidewall. The LT255/80R17 dimensions equal approximately 10.0 inches in width and fit a verified 6.5–8.5-inch rim-width range. A separate 255/80R17 page exists with the same nominal dimensions, but the LT designation must be checked separately because LT tire construction, load requirements, and inflation requirements affect replacement decisions.

LT255/80R17 Size Quick Specs

LT255/80R17 Dimensions in Inches

The LT255/80R17 tire size is approximately 10.0 inches wide, 33.1 inches tall overall, with a sidewall approximately 8.0 inches high. The 17-inch measurement identifies the wheel diameter that LT255/80R17 is designed to fit.

LT255/80R17 Measurements in Inches

• Section Width: Approx. 10.0 inches
• Sidewall Height: Approx. 8.0 inches
• Overall Diameter: Approx. 33.1 inches
• Circumference: Approx. 103.9 inches
• Wheel Diameter: 17 inches

LT255/80R17 Alternative Tire Sizes

Drivers comparing LT255/80R17 alternatives commonly consider LT285/70R17 and LT255/75R17. LT285/70R17 is wider and slightly shorter than LT255/80R17, while its overall diameter remains relatively close. LT255/75R17 keeps the same nominal width but uses a shorter sidewall and falls slightly outside the ±3% diameter guideline. The ±3% tire-size guideline is only a starting point: dimensional comparison alone does not establish interchangeability for LT255/80R17.

LT255/80R17 vs LT285/70R17

LT285/70R17 is approximately 1.07% smaller in overall diameter than LT255/80R17, placing the difference within the commonly used ±3% guideline.

• Width Difference: LT285/70R17 is nominally 30 mm wider than LT255/80R17.
• Diameter Difference: LT285/70R17 is approximately 0.4 inches smaller in overall diameter than LT255/80R17, a difference of 1.07%.
• Interchangeability: The LT285/70R17 diameter difference falls within the commonly used ±3% guideline, but that alone does not confirm interchangeability with LT255/80R17. Wheel width, load capacity, clearance, and vehicle requirements must still be checked.
• Practical Difference: Compared with LT255/80R17, LT285/70R17 provides 30 mm more nominal section width while reducing the calculated overall diameter slightly.

LT255/80R17 vs LT255/75R17

LT255/75R17 is approximately 3.04% smaller in overall diameter than LT255/80R17, placing the difference outside the commonly used ±3% guideline.

• Width Difference: LT255/75R17 and LT255/80R17 have the same nominal 255 mm section width.
• Diameter Difference: LT255/75R17 is approximately 1.0 inch smaller in overall diameter than LT255/80R17, a difference of 3.04%.
• Interchangeability: Acceptable. While an LT255/75R17 is 3.04% smaller in overall diameter than an LT255/80R17, this difference is well within the 5% threshold safely accommodated by light trucks. Because you are downsizing by roughly 1 inch in total height, physical fender clearance is not an issue.
  However, because you are shrinking the tire's air volume, you must adhere to the two golden rules of LT interchanges:
  • The Load & Inflation Rule: Ensure the smaller LT255/75R17 meets or exceeds your truck's factory Load Index. You will likely need to run a slightly higher PSI in the smaller tire to match the weight-bearing capacity of the larger one.
  • The Calibration Rule: Your speedometer will read roughly 3% faster than your actual speed, and your transmission shift points will slightly adapt. An electronic module programmer can instantly correct this.

• Practical Difference: LT255/75R17 retains the nominal width of LT255/80R17 but has a sidewall approximately 0.5 inches shorter, reducing the complete tire height by approximately 1.0 inch.