Tire RulerWhat changes when you switch to 205/70R15
- Height: +0.81″ (+3.2%), so ground clearance at the axle goes up 0.40″.
- Width: ±0.00″ (0 mm). A small change; clearance problems are unlikely if the height fits.
- Sidewall: +0.40″. A taller sidewall rides a bit softer and protects the wheel off-road.
- Revolutions per mile: 791 → 767. Your gears act about 3.2% taller; at 65 mph in a 0.69 top gear with 3.73s, that’s 2,206 → 2,138 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 205/70R15 than 205/65R15?
205/70R15 is 0.81 inches (3.2%) taller and 0.00 inches wider: 26.3" × 8.1" versus 25.5" × 8.1".
Will 205/70R15 change my speedometer?
Yes, by 3.2%. Going from 205/65R15 to 205/70R15, an indicated 60 mph is about 61.9 mph.
Can I replace 205/65R15 with 205/70R15?
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 205/65R15 to 205/70R15?
Usually not for a 3.2% change. With 3.73 gears, the 205/70R15 acts like 3.62.