275/60R20 vs 33x12.50R18
33x12.50R18 is 0.0% taller (+0.01 in) and 1.67 in wider than 275/60R20.
33x12.50R18 and 275/60R20 are the same overall diameter, so the speedometer stays accurate.
| 275/60R20 | 33x12.50R18 | Change | |
|---|---|---|---|
| Diameter | 32.99″ | 33.00″ | +0.01″+0.0% |
| Width | 10.83″ | 12.50″ | +1.67″+15.5% |
| Sidewall | 6.50″ | 7.50″ | +1.00″+15.5% |
| Circumference | 103.6″ | 103.7″ | +0.0″+0.0% |
| Wheel | 20″ | 18″ | −2″ |
| Revs per mile | 611 | 611 | −0 |
Real speed on 33x12.50R18.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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275/60R20 or 33x12.50R18?
Can I use 33x12.50R18 instead of 275/60R20?
33x12.50R18 and 275/60R20 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 33x12.50R18 you are really doing 60.0 mph if the speedometer was set up for 275/60R20. Going the other way, 275/60R20 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.