Tire RulerWhat changes when you switch to 255/70R16
- Height: +0.55″ (+1.9%), so ground clearance at the axle goes up 0.28″.
- Width: +0.39″ (10 mm). Check inner clearance to the suspension and frame, and the fender liner at full lock.
- Sidewall: +0.28″. A taller sidewall rides a bit softer and protects the wheel off-road.
- Revolutions per mile: 684 → 671. Your gears act about 1.9% taller; at 65 mph in a 0.69 top gear with 3.73s, that’s 1,906 → 1,871 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.
Other comparisons
Frequently asked questions
How much bigger is 255/70R16 than 245/70R16?
255/70R16 is 0.55 inches (1.9%) taller and 0.39 inches wider: 30.1" × 10.0" versus 29.5" × 9.6".
Will 255/70R16 change my speedometer?
Yes, by 1.9%. Going from 245/70R16 to 255/70R16, an indicated 60 mph is about 61.1 mph.
Can I replace 245/70R16 with 255/70R16?
Often, yes: the height difference is within the ±3% most tire shops accept. Both fit a 16" wheel; confirm the rim width, load index and clearance for your vehicle.
Do I need to regear going from 245/70R16 to 255/70R16?
Usually not for a 1.9% change. With 3.73 gears, the 255/70R16 acts like 3.66.