235/45R17 vs 215/55R17
215/55R17 is 3.9% taller (+0.98 in) and 0.79 in narrower than 235/45R17.
215/55R17 is 3.9% taller than 235/45R17. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 215/55R17.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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235/45R17 or 215/55R17?
Can I use 215/55R17 instead of 235/45R17?
215/55R17 is 3.9% taller than 235/45R17. 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 215/55R17 you are really doing 62.3 mph if the speedometer was set up for 235/45R17. Going the other way, 235/45R17 would make it read 57.8 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.49 in (+13 mm) under the axle.