285/50R20 vs 33x12.50R20
33x12.50R20 is 5.7% taller (+1.78 in) and 1.28 in wider than 285/50R20.
33x12.50R20 is 5.7% taller than 285/50R20. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
| 285/50R20 | 33x12.50R20 | Change | |
|---|---|---|---|
| Diameter | 31.22″ | 33.00″ | +1.78″+5.7% |
| Width | 11.22″ | 12.50″ | +1.28″+11.4% |
| Sidewall | 5.61″ | 6.50″ | +0.89″+15.9% |
| Circumference | 98.1″ | 103.7″ | +5.6″+5.7% |
| Wheel | 20″ | 20″ | Same |
| Revs per mile | 646 | 611 | −35 |
Real speed on 33x12.50R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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285/50R20 or 33x12.50R20?
Can I use 33x12.50R20 instead of 285/50R20?
33x12.50R20 is 5.7% taller than 285/50R20. 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 33x12.50R20 you are really doing 63.4 mph if the speedometer was set up for 285/50R20. Going the other way, 285/50R20 would make it read 56.8 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.89 in (+23 mm) under the axle.