305/55R20 vs 35x12.50R20
35x12.50R20 is 5.4% taller (+1.79 in) and 0.49 in wider than 305/55R20.
35x12.50R20 is 5.4% taller than 305/55R20. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
| 305/55R20 | 35x12.50R20 | Change | |
|---|---|---|---|
| Diameter | 33.21″ | 35.00″ | +1.79″+5.4% |
| Width | 12.01″ | 12.50″ | +0.49″+4.1% |
| Sidewall | 6.60″ | 7.50″ | +0.90″+13.6% |
| Circumference | 104.3″ | 110.0″ | +5.6″+5.4% |
| Wheel | 20″ | 20″ | Same |
| Revs per mile | 607 | 576 | −31 |
Real speed on 35x12.50R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 35x12.50R20 tires
Opens the store’s own searchPrices and stock change often, so check a few stores. We don’t earn anything from these links.
305/55R20 or 35x12.50R20?
Can I use 35x12.50R20 instead of 305/55R20?
35x12.50R20 is 5.4% taller than 305/55R20. 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 63.2 mph if the speedometer was set up for 305/55R20. Going the other way, 305/55R20 would make it read 56.9 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.90 in (+23 mm) under the axle.