SidewallerTire & wheel calculators

225/70R15 vs 235/75R15

235/75R15 is 5.4% taller (+1.48 in) and 0.39 in wider than 225/70R15.

Large
Big change

235/75R15 is 5.4% taller than 225/70R15. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.

225/70R15235/75R15Change
Diameter27.40″28.88″+1.48″+5.4%
Width8.86″9.25″+0.39″+4.4%
Sidewall6.20″6.94″+0.74″+11.9%
Circumference86.1″90.7″+4.6″+5.4%
Wheel15″15″Same
Revs per mile736698−38
SideTread
225/70R15235/75R15
Speedometer shows 60 mph63.2mph

Real speed on 235/75R15.

Ground clearance+0.74in

Change in height under the axle.

Width per side+0.20in

On the same wheel, split inboard and outboard.

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225/70R15 or 235/75R15?

Can I use 235/75R15 instead of 225/70R15?

235/75R15 is 5.4% taller than 225/70R15. 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 235/75R15 you are really doing 63.2 mph if the speedometer was set up for 225/70R15. Going the other way, 225/70R15 would make it read 56.9 mph at a real 60.

How much ground clearance does it change?

Half the diameter difference: +0.74 in (+19 mm) under the axle.

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