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All You Need To Know About LT245/70R17 Tire Size

LT245/70R17 has a 245 mm section width, a 70% aspect ratio, fits a 17-inch wheel, and has a calculated overall diameter of approximately 30.5 inches with a sidewall approximately 6.8 inches high. LT identifies LT245/70R17 as an LT-metric Light Truck tire size. A verified 245/70R17 version also exists with the same nominal dimensions, but the different designation means load capacity and inflation requirements must be checked rather than assuming interchangeability. Our LT tire guide explains why construction and load requirements matter when comparing LT and non-LT tires.

LT245/70R17 Size Quick Specs

Common Vehicle Fitments for LT245/70R17

LT245/70R17 is documented as a factory/OE tire size on specific Ford F-150 and Nissan NV3500 HD Passenger Van configurations.

• Ford F-150 — documented on selected configurations including Heavy-Duty Payload Package and FX4 applications.
• Nissan NV3500 HD Passenger Van

To check whether the LT245/70R17 tire size is a factory fitment for your specific vehicle, use our VIN lookup tool.

LT245/70R17 Dimensions in Inches

The LT245/70R17 tire size is approximately 9.6 inches wide, 30.5 inches tall overall, with a sidewall approximately 6.8 inches high. LT245/70R17 fits a 17-inch-diameter wheel, while its sidewall height describes the approximate distance between the wheel and the outer tread diameter.

LT245/70R17 in Inches: All Measurements

• Overall Diameter: Approx. 30.5 inches
• Section Width: Approx. 9.6 inches
• Sidewall Height: Approx. 6.8 inches
• Wheel Diameter: 17 inches
• Circumference: Approx. 95.8 inches

LT245/70R17 Alternative Tire Sizes

Drivers comparing alternatives to LT245/70R17 commonly consider LT245/75R17 and LT265/70R17. LT245/75R17 keeps the same nominal width but uses a taller sidewall, while LT265/70R17 is wider and also taller overall than LT245/70R17. Both alternatives fall slightly outside the commonly used ±3% overall-diameter guideline, so neither should be treated as a direct size swap based on dimensions alone. The ±3% tire-size guideline is only a starting point; wheel width, load capacity, clearance, and vehicle requirements still need checking.

LT245/70R17 vs LT245/75R17

LT245/75R17 is approximately 3.16% larger in overall diameter than LT245/70R17, placing the difference just outside the commonly used ±3% guideline.

• Width Difference: LT245/70R17 and LT245/75R17 both have a nominal 245 mm section width, so the nominal width difference is 0 mm.
• Diameter Difference: LT245/75R17 is approximately 1.0 inch taller overall than LT245/70R17, a 3.16% increase in overall diameter.
• Interchangeability: LT245/75R17 falls outside the commonly used ±3% diameter guideline and is generally not recommended as a direct size swap for LT245/70R17. A larger diameter change can affect speedometer accuracy, vehicle clearance, and vehicle systems calibrated around the original tire diameter.
• Practical Difference: LT245/75R17 keeps the same nominal width as LT245/70R17 but increases the sidewall height, producing a tire that is approximately 1.0 inch taller overall.

LT245/70R17 vs LT265/70R17

LT265/70R17 is approximately 3.61% larger in overall diameter than LT245/70R17, placing the difference outside the commonly used ±3% guideline.

• Width Difference: LT265/70R17 is nominally 20 mm wider than LT245/70R17.
• Diameter Difference: LT265/70R17 is approximately 1.1 inches taller overall than LT245/70R17, a 3.61% increase in overall diameter.
• Interchangeability: LT265/70R17 falls outside the commonly used ±3% diameter guideline and is generally not recommended as a direct size swap for LT245/70R17. The larger diameter change can affect speedometer accuracy, vehicle clearance, and vehicle systems calibrated around the original tire diameter.
• Practical Difference: LT265/70R17 adds 20 mm of nominal section width and approximately 1.1 inches of overall diameter compared with LT245/70R17.

Safe Alternatives to LT245/70R17 Size

For a closer dimensional alternative to LT245/70R17, LT265/65R17 is only about 0.2% larger in overall diameter while adding 20 mm of nominal section width. LT255/65R17 is about 1.5% smaller, while LT255/70R17 is about 1.8% larger; all three remain within the commonly used ±3% diameter guideline. These LT sizes are verified to exist, but the close diameter match alone does not make them direct replacements for LT245/70R17. Before swapping, confirm the replacement tire’s load capacity and inflation requirements, approved wheel width, vehicle clearance, and vehicle-specific fitment.