255/50R20 vs 285/50R20
285/50R20 is 3.9% taller (+1.18 in) and 1.18 in wider than 255/50R20.
285/50R20 is 3.9% taller than 255/50R20. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 285/50R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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255/50R20 or 285/50R20?
Can I use 285/50R20 instead of 255/50R20?
285/50R20 is 3.9% taller than 255/50R20. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock. 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 285/50R20 you are really doing 62.4 mph if the speedometer was set up for 255/50R20. Going the other way, 255/50R20 would make it read 57.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.59 in (+15 mm) under the axle.