Tire RulerWhat changes when you switch to 265/60R18
- Height: +1.42″ (+4.9%), so ground clearance at the axle goes up 0.71″.
- Width: +1.18″ (30 mm). Check inner clearance to the suspension and frame, and the fender liner at full lock.
- Sidewall: +0.71″. A taller sidewall rides a bit softer and protects the wheel off-road.
- Revolutions per mile: 693 → 661. Your gears act about 4.9% taller; at 65 mph in a 0.69 top gear with 3.73s, that’s 1,932 → 1,842 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 265/60R18 than 235/60R18?
265/60R18 is 1.42 inches (4.9%) taller and 1.18 inches wider: 30.5" × 10.4" versus 29.1" × 9.3".
Will 265/60R18 change my speedometer?
Yes, by 4.9%. Going from 235/60R18 to 265/60R18, an indicated 60 mph is about 62.9 mph.
Can I replace 235/60R18 with 265/60R18?
Possibly, but the height difference is over 3%, so check clearance and plan to recalibrate the speedometer. Both fit an 18" wheel; confirm the rim width, load index and clearance for your vehicle.
Do I need to regear going from 235/60R18 to 265/60R18?
It's worth considering. To restore 3.73 gearing you'd need about 3.91 (3.73 or 3.92).