265/35R18 vs 215/55R16
215/55R16 is 0.0% taller (+0.01 in) and 1.97 in narrower than 265/35R18.
215/55R16 and 265/35R18 are the same overall diameter, so the speedometer stays accurate.
Real speed on 215/55R16.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 215/55R16 tires
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265/35R18 or 215/55R16?
Can I use 215/55R16 instead of 265/35R18?
215/55R16 and 265/35R18 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 215/55R16 you are really doing 60.0 mph if the speedometer was set up for 265/35R18. Going the other way, 265/35R18 would make it read 60.0 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.00 in (+0 mm) under the axle.