Tire RulerWhat changes when you switch to 225/70R15
- Height: +1.10″ (+4.2%), 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: 767 → 736. Your gears act about 4.2% taller; at 65 mph in a 0.69 top gear with 3.73s, that’s 2,138 → 2,052 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 225/70R15 than 205/70R15?
225/70R15 is 1.10 inches (4.2%) taller and 0.79 inches wider: 27.4" × 8.9" versus 26.3" × 8.1".
Will 225/70R15 change my speedometer?
Yes, by 4.2%. Going from 205/70R15 to 225/70R15, an indicated 60 mph is about 62.5 mph.
Can I replace 205/70R15 with 225/70R15?
Possibly, but the height difference is over 3%, so check clearance and plan to recalibrate the speedometer. Both fit a 15" wheel; confirm the rim width, load index and clearance for your vehicle.
Do I need to regear going from 205/70R15 to 225/70R15?
It's worth considering. To restore 3.73 gearing you'd need about 3.89 (3.73 or 3.92).