Tire RulerWhat changes when you switch to 265/50R20
- Height: +1.04″ (+3.5%), 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: 686 → 663. Your gears act about 3.5% taller; at 65 mph in a 0.69 top gear with 3.73s, that’s 1,913 → 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 265/45R20?
265/50R20 is 1.04 inches (3.5%) taller and 0.00 inches wider: 30.4" × 10.4" versus 29.4" × 10.4".
Will 265/50R20 change my speedometer?
Yes, by 3.5%. Going from 265/45R20 to 265/50R20, an indicated 60 mph is about 62.1 mph.
Can I replace 265/45R20 with 265/50R20?
Possibly, but the height difference is over 3%, so check clearance and plan to recalibrate the speedometer. Both fit a 20" wheel; confirm the rim width, load index and clearance for your vehicle.
Do I need to regear going from 265/45R20 to 265/50R20?
Usually not for a 3.5% change. With 3.73 gears, the 265/50R20 acts like 3.60.