Tire RulerWhat changes when you switch to 285/70R17
- Height: +1.10″ (+3.5%), so ground clearance at the axle goes up 0.55″.
- Width: +0.79″ (20 mm). Check inner clearance to the suspension and frame, and the fender liner at full lock.
- Sidewall: +0.55″. A taller sidewall rides a bit softer and protects the wheel off-road.
- Revolutions per mile: 638 → 617. Your gears act about 3.5% taller; at 65 mph in a 0.69 top gear with 3.73s, that’s 1,779 → 1,719 RPM.
Sizes are theoretical, from the sidewall code. The same size can differ by a few tenths of an inch between brands and tread patterns; check the maker’s spec sheet for the exact model.
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Frequently asked questions
How much bigger is 285/70R17 than 265/70R17?
285/70R17 is 1.10 inches (3.5%) taller and 0.79 inches wider: 32.7" × 11.2" versus 31.6" × 10.4".
Will 285/70R17 change my speedometer?
Yes, by 3.5%. Going from 265/70R17 to 285/70R17, an indicated 60 mph is about 62.1 mph.
Can I replace 265/70R17 with 285/70R17?
Possibly, but the height difference is over 3%, so check clearance and plan to recalibrate the speedometer. Both fit a 17" wheel; confirm the rim width, load index and clearance for your vehicle.
Do I need to regear going from 265/70R17 to 285/70R17?
Usually not for a 3.5% change. With 3.73 gears, the 285/70R17 acts like 3.60.