215/45R17 vs 205/50R17
205/50R17 is 1.8% taller (+0.45 in) and 0.39 in narrower than 215/45R17.
205/50R17 is 1.8% taller than 215/45R17. That is inside the ±3% most shops treat as a straight swap.
Real speed on 205/50R17.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 205/50R17 tires
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215/45R17 or 205/50R17?
Can I use 205/50R17 instead of 215/45R17?
205/50R17 is 1.8% taller than 215/45R17. 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 205/50R17 you are really doing 61.1 mph if the speedometer was set up for 215/45R17. Going the other way, 215/45R17 would make it read 58.9 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.23 in (+6 mm) under the axle.