205/70R15 vs 215/55R17
215/55R17 is 0.0% taller (+0.01 in) and 0.39 in wider than 205/70R15.
215/55R17 and 205/70R15 are the same overall diameter, so the speedometer stays accurate.
Real speed on 215/55R17.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 215/55R17 tires
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205/70R15 or 215/55R17?
Can I use 215/55R17 instead of 205/70R15?
215/55R17 and 205/70R15 are the same overall diameter, so the speedometer stays accurate. 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 215/55R17 you are really doing 60.0 mph if the speedometer was set up for 205/70R15. Going the other way, 205/70R15 would make it read 60.0 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.01 in (+0 mm) under the axle.