T135/80D17 Tire Size

T135/80D17 Spare Tire: The Tall Compact Spare Size Explained

T135/80D17 is a temporary compact spare tire that is both wider and taller than T125/70D17 - a size chosen by vehicle manufacturers when a closer match to the original tire's rolling diameter is required.

While T125/70D17 is the most common compact spare for 17-inch fitments, T135/80D17 appears on vehicles whose OEM tires are tall enough that a narrower, shorter spare would create a meaningful diameter mismatch affecting ABS and stability systems.

T135/80D17 Quick Specs

What Each Part of the T135/80D17 Size Means

• T - Temporary spare tire
• 135 - Tire width in millimeters
• 80 - Aspect ratio (sidewall height is 80% of section width)
• D - Diagonal (bias-ply) construction
• 17 - Wheel diameter in inches

T135/80D17 vs T125/70D17: Why the Extra Width and Height?

T125/70D17 and T135/80D17 both serve the same emergency function, but they are not interchangeable; always use the exact size specified for your vehicle.

The taller 80% aspect ratio, combined with the wider 135 mm section of the T135/80D17 tire, produces a larger overall diameter. This helps vehicles with taller OEM tires maintain closer parity between the spare and the remaining three tires, which matters for differential and AWD system stress as well as ABS accuracy.

Critical Usage Limits for T135/80D17

Same hard limits apply for T135/80D17 as all T-type spares: 50 mph maximum speed, 60 psi inflation pressure, and approximately 50 miles to a service facility. These limits exist because the tire's structure, rubber compound, and heat dissipation are not designed for sustained highway driving. Learn more about Spare Tire Limits in our dedicated guide.