275/45R20 vs 255/55R20
255/55R20 is 4.4% taller (+1.30 in) and 0.79 in narrower than 275/45R20.
255/55R20 is 4.4% taller than 275/45R20. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 255/55R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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275/45R20 or 255/55R20?
Can I use 255/55R20 instead of 275/45R20?
255/55R20 is 4.4% taller than 275/45R20. 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 255/55R20 you are really doing 62.6 mph if the speedometer was set up for 275/45R20. Going the other way, 275/45R20 would make it read 57.5 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.65 in (+17 mm) under the axle.