265/60R18 vs 275/65R18
275/65R18 is 5.1% taller (+1.56 in) and 0.39 in wider than 265/60R18.
275/65R18 is 5.1% taller than 265/60R18. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
Real speed on 275/65R18.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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265/60R18 or 275/65R18?
Can I use 275/65R18 instead of 265/60R18?
275/65R18 is 5.1% taller than 265/60R18. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears. 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 275/65R18 you are really doing 63.1 mph if the speedometer was set up for 265/60R18. Going the other way, 265/60R18 would make it read 57.1 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.78 in (+20 mm) under the axle.