215/45R18 vs 225/60R15
225/60R15 is 0.0% taller (+0.01 in) and 0.39 in wider than 215/45R18.
225/60R15 and 215/45R18 are the same overall diameter, so the speedometer stays accurate.
Real speed on 225/60R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 225/60R15 tires
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215/45R18 or 225/60R15?
Can I use 225/60R15 instead of 215/45R18?
225/60R15 and 215/45R18 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 225/60R15 you are really doing 60.0 mph if the speedometer was set up for 215/45R18. Going the other way, 215/45R18 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.