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All You Need To Know About LT245/70R17C Tire Size

LT245/70R17C 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. The LT prefix identifies LT245/70R17C as an LT (Light Truck) size, while the C suffix identifies its Load Range C specification. The same 245/70R17 dimensions also exist under other designations, including P245/70R17, but matching numerical dimensions do not make the different designations automatically interchangeable because load capacity and inflation requirements must also match the vehicle.

LT245/70R17C Size Quick Specs

What Vehicles Use LT245/70R17C Tires?

LT245/70R17C is documented as a factory/OE tire size for the Chevrolet Silverado and GMC Sierra, with GM tire-usage documentation identifying the exact LT245/70R17C designation and the QXR tire option for these vehicles.

• Chevrolet Silverado 1500
• GMC Sierra 1500

To check whether the LT245/70R17C tire size is a factory fitment for your specific vehicle, use our VIN lookup tool.

LT245/70R17C Dimensions in Inches

The LT245/70R17C tire size is approximately 9.6 inches wide, 30.5 inches tall overall, with a sidewall approximately 6.8 inches high. For LT245/70R17C, the 17-inch figure identifies the wheel diameter the tire is designed to fit, while the 30.5-inch measurement represents the approximate complete tire height.

LT245/70R17C in Inches: All Measurements

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

LT245/70R17C Alternative Tire Sizes

LT255/70R17C and LT265/70R17C are useful alternatives to compare with LT245/70R17C because these C-load-range LT sizes are documented within the same light-truck fitment space, including GMC Sierra applications. LT255/70R17C is wider and slightly taller than LT245/70R17C while keeping a relatively close overall diameter. LT265/70R17C is wider and taller and falls outside the commonly used ±3% diameter guideline. The ±3% guideline is only a starting point when comparing tire sizes and does not establish interchangeability.

LT245/70R17C vs LT255/70R17C

LT255/70R17C is approximately 1.81% larger in overall diameter than LT245/70R17C, so the difference is within the commonly used ±3% diameter guideline.

• Width Difference: LT255/70R17C is 10 mm wider than LT245/70R17C.
• Diameter Difference: LT255/70R17C is approximately 0.55 inches taller overall than LT245/70R17C, a 1.81% increase.
• Interchangeability: The 1.81% diameter difference between LT255/70R17C and LT245/70R17C falls within the commonly used ±3% guideline, making interchangeability possible. Wheel width, load capacity, clearance, and vehicle requirements must still be checked.
• Practical Difference: LT255/70R17C adds 10 mm of nominal section width and approximately 0.55 inches of overall diameter compared with LT245/70R17C.

LT245/70R17C vs LT265/70R17C

LT265/70R17C is approximately 3.61% larger in overall diameter than LT245/70R17C, so the difference falls outside the commonly used ±3% diameter guideline.

• Width Difference: LT265/70R17C is 20 mm wider than LT245/70R17C.
• Diameter Difference: LT265/70R17C is approximately 1.10 inches taller overall than LT245/70R17C, a 3.61% increase.
• Interchangeability: LT265/70R17C falls outside the commonly used ±3% guideline and is generally not recommended as a direct size swap for LT245/70R17C based on diameter. A larger diameter change can affect speedometer accuracy, vehicle clearance, and vehicle systems calibrated around the original tire diameter. LT255/70R17C is a closer size to compare with LT245/70R17C, with an overall-diameter difference of 1.81%, which remains within the ±3% guideline.
• Practical Difference: LT265/70R17C adds 20 mm of nominal section width and approximately 1.10 inches of overall diameter compared with LT245/70R17C.