275/60R20 vs 35x12.50R20
35x12.50R20 is 6.1% taller (+2.01 in) and 1.67 in wider than 275/60R20.
35x12.50R20 is 6.1% taller than 275/60R20. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
| 275/60R20 | 35x12.50R20 | Change | |
|---|---|---|---|
| Diameter | 32.99″ | 35.00″ | +2.01″+6.1% |
| Width | 10.83″ | 12.50″ | +1.67″+15.5% |
| Sidewall | 6.50″ | 7.50″ | +1.00″+15.5% |
| Circumference | 103.6″ | 110.0″ | +6.3″+6.1% |
| Wheel | 20″ | 20″ | Same |
| Revs per mile | 611 | 576 | −35 |
Real speed on 35x12.50R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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275/60R20 or 35x12.50R20?
Can I use 35x12.50R20 instead of 275/60R20?
35x12.50R20 is 6.1% taller than 275/60R20. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears. Also match or beat the original load index and speed rating, and check that the wheel width suits the new tire.
Will my speedometer be off?
At an indicated 60 mph on 35x12.50R20 you are really doing 63.7 mph if the speedometer was set up for 275/60R20. Going the other way, 275/60R20 would make it read 56.6 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +1.00 in (+26 mm) under the axle.