35x12.50R18 vs 35x12.50R20
35x12.50R20 is 0.0% taller (0.00 in) and the same width than 35x12.50R18.
35x12.50R20 and 35x12.50R18 are the same overall diameter, so the speedometer stays accurate.
| 35x12.50R18 | 35x12.50R20 | Change | |
|---|---|---|---|
| Diameter | 35.00″ | 35.00″ | 0.00″0.0% |
| Width | 12.50″ | 12.50″ | 0.00″0.0% |
| Sidewall | 8.50″ | 7.50″ | −1.00″−11.8% |
| Circumference | 110.0″ | 110.0″ | 0.0″0.0% |
| Wheel | 18″ | 20″ | +2″ |
| Revs per mile | 576 | 576 | 0 |
Real speed on 35x12.50R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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35x12.50R18 or 35x12.50R20?
Can I use 35x12.50R20 instead of 35x12.50R18?
35x12.50R20 and 35x12.50R18 are the same overall diameter, so the speedometer stays accurate. 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 60.0 mph if the speedometer was set up for 35x12.50R18. Going the other way, 35x12.50R18 would make it read 60.0 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: 0.00 in (0 mm) under the axle.