245/40R18 vs 275/40R18
275/40R18 is 3.7% taller (+0.94 in) and 1.18 in wider than 245/40R18.
275/40R18 is 3.7% taller than 245/40R18. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 275/40R18.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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245/40R18 or 275/40R18?
Can I use 275/40R18 instead of 245/40R18?
275/40R18 is 3.7% taller than 245/40R18. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock. 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 275/40R18 you are really doing 62.2 mph if the speedometer was set up for 245/40R18. Going the other way, 245/40R18 would make it read 57.9 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.47 in (+12 mm) under the axle.