215/75R15 vs 255/70R15
255/70R15 is 4.9% taller (+1.36 in) and 1.57 in wider than 215/75R15.
255/70R15 is 4.9% taller than 215/75R15. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 255/70R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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215/75R15 or 255/70R15?
Can I use 255/70R15 instead of 215/75R15?
255/70R15 is 4.9% taller than 215/75R15. 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 255/70R15 you are really doing 62.9 mph if the speedometer was set up for 215/75R15. Going the other way, 215/75R15 would make it read 57.2 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.68 in (+17 mm) under the axle.