Tire RulerWhat changes when you switch to 235/75R15
- Height: +0.59″ (+2.1%), so ground clearance at the axle goes up 0.30″.
- Width: +0.39″ (10 mm). Check inner clearance to the suspension and frame, and the fender liner at full lock.
- Sidewall: +0.30″. A taller sidewall rides a bit softer and protects the wheel off-road.
- Revolutions per mile: 713 → 698. Your gears act about 2.1% taller; at 65 mph in a 0.69 top gear with 3.73s, that’s 1,988 → 1,947 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 235/75R15 than 225/75R15?
235/75R15 is 0.59 inches (2.1%) taller and 0.39 inches wider: 28.9" × 9.3" versus 28.3" × 8.9".
Will 235/75R15 change my speedometer?
Yes, by 2.1%. Going from 225/75R15 to 235/75R15, an indicated 60 mph is about 61.3 mph.
Can I replace 225/75R15 with 235/75R15?
Often, yes: the height difference is within the ±3% most tire shops accept. Both fit a 15" wheel; confirm the rim width, load index and clearance for your vehicle.
Do I need to regear going from 225/75R15 to 235/75R15?
Usually not for a 2.1% change. With 3.73 gears, the 235/75R15 acts like 3.65.