235/55R20 vs 285/50R20
285/50R20 is 3.5% taller (+1.04 in) and 1.97 in wider than 235/55R20.
285/50R20 is 3.5% taller than 235/55R20. 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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235/55R20 or 285/50R20?
Can I use 285/50R20 instead of 235/55R20?
285/50R20 is 3.5% taller than 235/55R20. 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 62.1 mph if the speedometer was set up for 235/55R20. Going the other way, 235/55R20 would make it read 58.0 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.52 in (+13 mm) under the axle.