285/75R18 vs 35x12.50R20
35x12.50R20 is 0.5% taller (+0.17 in) and 1.28 in wider than 285/75R18.
35x12.50R20 is 0.5% taller than 285/75R18. That is inside the ±3% most shops treat as a straight swap.
| 285/75R18 | 35x12.50R20 | Change | |
|---|---|---|---|
| Diameter | 34.83″ | 35.00″ | +0.17″+0.5% |
| Width | 11.22″ | 12.50″ | +1.28″+11.4% |
| Sidewall | 8.42″ | 7.50″ | −0.92″−10.9% |
| Circumference | 109.4″ | 110.0″ | +0.5″+0.5% |
| Wheel | 18″ | 20″ | +2″ |
| Revs per mile | 579 | 576 | −3 |
Real speed on 35x12.50R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 35x12.50R20 tires
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285/75R18 or 35x12.50R20?
Can I use 35x12.50R20 instead of 285/75R18?
35x12.50R20 is 0.5% taller than 285/75R18. That is inside the ±3% most shops treat as a straight swap. 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 60.3 mph if the speedometer was set up for 285/75R18. Going the other way, 285/75R18 would make it read 59.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.08 in (+2 mm) under the axle.