225/55R18 vs 245/35R21
245/35R21 is 0.0% taller (+0.01 in) and 0.79 in wider than 225/55R18.
245/35R21 and 225/55R18 are the same overall diameter, so the speedometer stays accurate.
Real speed on 245/35R21.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 245/35R21 tires
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225/55R18 or 245/35R21?
Can I use 245/35R21 instead of 225/55R18?
245/35R21 and 225/55R18 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 245/35R21 you are really doing 60.0 mph if the speedometer was set up for 225/55R18. Going the other way, 225/55R18 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.