Tire RulerWhat changes when you switch to 265/70R18
- Height: +1.04″ (+3.3%), so ground clearance at the axle goes up 0.52″.
- Width: ±0.00″ (0 mm). A small change; clearance problems are unlikely if the height fits.
- Sidewall: +0.52″. A taller sidewall rides a bit softer and protects the wheel off-road.
- Revolutions per mile: 639 → 619. Your gears act about 3.3% taller; at 65 mph in a 0.69 top gear with 3.73s, that’s 1,782 → 1,725 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.
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Frequently asked questions
How much bigger is 265/70R18 than 265/65R18?
265/70R18 is 1.04 inches (3.3%) taller and 0.00 inches wider: 32.6" × 10.4" versus 31.6" × 10.4".
Will 265/70R18 change my speedometer?
Yes, by 3.3%. Going from 265/65R18 to 265/70R18, an indicated 60 mph is about 62.0 mph.
Can I replace 265/65R18 with 265/70R18?
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 265/65R18 to 265/70R18?
Usually not for a 3.3% change. With 3.73 gears, the 265/70R18 acts like 3.61.