215/70R15 vs 255/70R15
255/70R15 is 8.2% taller (+2.20 in) and 1.57 in wider than 215/70R15.
255/70R15 is 8.2% taller than 215/70R15. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
Real speed on 255/70R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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215/70R15 or 255/70R15?
Can I use 255/70R15 instead of 215/70R15?
255/70R15 is 8.2% taller than 215/70R15. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears. 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 64.9 mph if the speedometer was set up for 215/70R15. Going the other way, 215/70R15 would make it read 55.4 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +1.10 in (+28 mm) under the axle.