Tire Size Calculator · Practical guide
What Size Is a 265/70R17 Tire in Inches?
A 265/70R17 measures about 31.6 inches tall and 10.4 inches wide on a 17-inch wheel — here's the exact math.
At a glance
The Answer
A 265/70R17 tire is 31.6 inches tall (31.61 in exactly) and about 10.4 inches wide, mounted on a 17-inch wheel. It's one of the most common factory sizes on full-size trucks and body-on-frame SUVs.
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Results
The Math
- Sidewall height: 265 mm × 0.70 = 185.5 mm = 7.30 inches
- Overall diameter: 17 + 2 × 7.30 = 31.61 inches
- Width: 265 ÷ 25.4 = 10.43 inches
Common Truck and SUV Sizes in Inches
| Size | Diameter | Width |
|---|---|---|
| 245/75R16 | 30.47 in | 9.65 in |
| 265/65R17 | 30.56 in | 10.43 in |
| 265/70R17 | 31.61 in | 10.43 in |
| 285/70R17 | 32.71 in | 11.22 in |
Why Diameter Matters
Overall diameter drives speedometer accuracy, gearing, and fender clearance. Moving from a 265/70R17 to a 285/70R17 adds 3.5% in height — slightly above the 3% guideline, so check clearance and expect the speedometer to read about 2 mph low at highway speed. Enter both sizes in the calculator above to see the exact difference before you buy.
Frequently Asked Questions
How wide is a 265 tire in inches?
10.43 inches — 265 millimeters divided by 25.4. The width is measured sidewall to sidewall at the widest point.
What is the sidewall height of a 265/70R17?
7.30 inches. The 70 is the aspect ratio, meaning the sidewall is 70% of the 265 mm width: 185.5 mm.
Is a 265/70R17 considered a 32-inch tire?
It sits just under, at 31.6 inches. Off-road sellers sometimes group it with 32-inch-class tires, but the exact figure is what matters for speedometer accuracy.
Can I replace 265/70R17 with 285/70R17?
The 285 is 3.5% taller and 0.8 inches wider, slightly beyond the 3% rule of thumb. It fits many trucks without modification, but verify clearance and recalibrate the speedometer if your vehicle supports it.