245/45R17 vs 215/55R17
215/55R17 is 2.5% taller (+0.63 in) and 1.18 in narrower than 245/45R17.
215/55R17 is 2.5% taller than 245/45R17. That is inside the ±3% most shops treat as a straight swap.
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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245/45R17 or 215/55R17?
Can I use 215/55R17 instead of 245/45R17?
215/55R17 is 2.5% taller than 245/45R17. That is inside the ±3% most shops treat as a straight swap. 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 61.5 mph if the speedometer was set up for 245/45R17. Going the other way, 245/45R17 would make it read 58.6 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.31 in (+8 mm) under the axle.