SidewallerTire & wheel calculators

255/60R18 vs 265/65R18

265/65R18 is 5.0% taller (+1.52 in) and 0.39 in wider than 255/60R18.

Large
Big change

265/65R18 is 5.0% taller than 255/60R18. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.

255/60R18265/65R18Change
Diameter30.05″31.56″+1.52″+5.0%
Width10.04″10.43″+0.39″+3.9%
Sidewall6.02″6.78″+0.76″+12.6%
Circumference94.4″99.2″+4.8″+5.0%
Wheel18″18″Same
Revs per mile671639−32
SideTread
255/60R18265/65R18
Speedometer shows 60 mph63.0mph

Real speed on 265/65R18.

Ground clearance+0.76in

Change in height under the axle.

Width per side+0.20in

On the same wheel, split inboard and outboard.

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255/60R18 or 265/65R18?

Can I use 265/65R18 instead of 255/60R18?

265/65R18 is 5.0% taller than 255/60R18. 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 265/65R18 you are really doing 63.0 mph if the speedometer was set up for 255/60R18. Going the other way, 255/60R18 would make it read 57.1 mph at a real 60.

How much ground clearance does it change?

Half the diameter difference: +0.76 in (+19 mm) under the axle.

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