235/60R18 vs 265/60R18
265/60R18 is 4.9% taller (+1.42 in) and 1.18 in wider than 235/60R18.
265/60R18 is 4.9% taller than 235/60R18. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 265/60R18.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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235/60R18 or 265/60R18?
Can I use 265/60R18 instead of 235/60R18?
265/60R18 is 4.9% taller than 235/60R18. 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 265/60R18 you are really doing 62.9 mph if the speedometer was set up for 235/60R18. Going the other way, 235/60R18 would make it read 57.2 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.71 in (+18 mm) under the axle.