SidewallerTire & wheel calculators

245/50R18 vs 225/60R18

225/60R18 is 3.6% taller (+0.98 in) and 0.79 in narrower than 245/50R18.

Caution
Check before you buy

225/60R18 is 3.6% taller than 245/50R18. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.

245/50R18225/60R18Change
Diameter27.65″28.63″+0.98″+3.6%
Width9.65″8.86″−0.79″−8.2%
Sidewall4.82″5.31″+0.49″+10.2%
Circumference86.9″89.9″+3.1″+3.6%
Wheel18″18″Same
Revs per mile730704−25
SideTread
245/50R18225/60R18
Speedometer shows 60 mph62.1mph

Real speed on 225/60R18.

Ground clearance+0.49in

Change in height under the axle.

Width per side−0.39in

On the same wheel, split inboard and outboard.

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245/50R18 or 225/60R18?

Can I use 225/60R18 instead of 245/50R18?

225/60R18 is 3.6% taller than 245/50R18. 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 225/60R18 you are really doing 62.1 mph if the speedometer was set up for 245/50R18. Going the other way, 245/50R18 would make it read 57.9 mph at a real 60.

How much ground clearance does it change?

Half the diameter difference: +0.49 in (+13 mm) under the axle.

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