Tire RulerWhat changes when you switch to 265/50R20
- Height: +0.79″ (+2.7%), so ground clearance at the axle goes up 0.39″.
- Width: +0.79″ (20 mm). Check inner clearance to the suspension and frame, and the fender liner at full lock.
- Sidewall: +0.39″. A taller sidewall rides a bit softer and protects the wheel off-road.
- Revolutions per mile: 680 → 663. Your gears act about 2.7% taller; at 65 mph in a 0.69 top gear with 3.73s, that’s 1,897 → 1,848 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 265/50R20 than 245/50R20?
265/50R20 is 0.79 inches (2.7%) taller and 0.79 inches wider: 30.4" × 10.4" versus 29.6" × 9.6".
Will 265/50R20 change my speedometer?
Yes, by 2.7%. Going from 245/50R20 to 265/50R20, an indicated 60 mph is about 61.6 mph.
Can I replace 245/50R20 with 265/50R20?
Often, yes: the height difference is within the ±3% most tire shops accept. Both fit a 20" wheel; confirm the rim width, load index and clearance for your vehicle.
Do I need to regear going from 245/50R20 to 265/50R20?
Usually not for a 2.7% change. With 3.73 gears, the 265/50R20 acts like 3.63.