SidewallerTire & wheel calculators

255/55R19 vs 255/60R18

255/60R18 is 0.0% taller (+0.00 in) and the same width than 255/55R19.

OK
Same height

255/60R18 and 255/55R19 are the same overall diameter, so the speedometer stays accurate.

255/55R19255/60R18Change
Diameter30.04″30.05″+0.00″+0.0%
Width10.04″10.04″0.00″0.0%
Sidewall5.52″6.02″+0.50″+9.1%
Circumference94.4″94.4″+0.0″+0.0%
Wheel19″18″−1″
Revs per mile671671−0
SideTread
255/55R19255/60R18
Speedometer shows 60 mph60.0mph

Real speed on 255/60R18.

Ground clearance+0.00in

Change in height under the axle.

Width per side0.00in

On the same wheel, split inboard and outboard.

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255/55R19 or 255/60R18?

Can I use 255/60R18 instead of 255/55R19?

255/60R18 and 255/55R19 are the same overall diameter, so the speedometer stays accurate. 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 60.0 mph if the speedometer was set up for 255/55R19. Going the other way, 255/55R19 would make it read 60.0 mph at a real 60.

How much ground clearance does it change?

Half the diameter difference: +0.00 in (+0 mm) under the axle.

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