255/45R20 vs 255/50R20
255/50R20 is 3.5% taller (+1.00 in) and the same width than 255/45R20.
255/50R20 is 3.5% taller than 255/45R20. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 255/50R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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255/45R20 or 255/50R20?
Can I use 255/50R20 instead of 255/45R20?
255/50R20 is 3.5% taller than 255/45R20. 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 255/50R20 you are really doing 62.1 mph if the speedometer was set up for 255/45R20. Going the other way, 255/45R20 would make it read 58.0 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.50 in (+13 mm) under the axle.