Tire RulerWhat changes when you switch to 275/60R20
- Height: +1.42″ (+4.5%), 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: 639 → 611. Your gears act about 4.5% taller; at 65 mph in a 0.69 top gear with 3.73s, that’s 1,781 → 1,704 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 275/60R20 than 245/60R20?
275/60R20 is 1.42 inches (4.5%) taller and 1.18 inches wider: 33.0" × 10.8" versus 31.6" × 9.6".
Will 275/60R20 change my speedometer?
Yes, by 4.5%. Going from 245/60R20 to 275/60R20, an indicated 60 mph is about 62.7 mph.
Can I replace 245/60R20 with 275/60R20?
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 245/60R20 to 275/60R20?
It's worth considering. To restore 3.73 gearing you'd need about 3.90 (3.73 or 3.92).