SidewallerTire & wheel calculators

225/60R18 vs 255/60R18

255/60R18 is 5.0% taller (+1.42 in) and 1.18 in wider than 225/60R18.

Caution
Check before you buy

255/60R18 is 5.0% taller than 225/60R18. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.

225/60R18255/60R18Change
Diameter28.63″30.05″+1.42″+5.0%
Width8.86″10.04″+1.18″+13.3%
Sidewall5.31″6.02″+0.71″+13.3%
Circumference89.9″94.4″+4.5″+5.0%
Wheel18″18″Same
Revs per mile704671−33
SideTread
225/60R18255/60R18
Speedometer shows 60 mph63.0mph

Real speed on 255/60R18.

Ground clearance+0.71in

Change in height under the axle.

Width per side+0.59in

On the same wheel, split inboard and outboard.

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225/60R18 or 255/60R18?

Can I use 255/60R18 instead of 225/60R18?

255/60R18 is 5.0% taller than 225/60R18. 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 255/60R18 you are really doing 63.0 mph if the speedometer was set up for 225/60R18. Going the other way, 225/60R18 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.

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