285/35R21 vs 235/75R15

235/75R15 is 0.1% taller (+0.02 in) and 1.97 in narrower than 285/35R21.

Close match

235/75R15 is 0.1% taller than 285/35R21. That is inside the ±3% most shops treat as a straight swap.

	285/35R21	235/75R15	Change
Diameter	28.85″	28.88″	+0.02″+0.1%
Width	11.22″	9.25″	−1.97″−17.5%
Sidewall	3.93″	6.94″	+3.01″+76.7%
Circumference	90.6″	90.7″	+0.1″+0.1%
Wheel	21″	15″	−6″
Revs per mile	699	698	−1

285/35R21235/75R15

Change sizes Speedometer table Gearing

Speedometer shows 60 mph60.0mph

Real speed on 235/75R15.

Ground clearance+0.01in

Change in height under the axle.

Width per side−0.98in

On the same wheel, split inboard and outboard.

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285/35R21 or 235/75R15?

Can I use 235/75R15 instead of 285/35R21?

235/75R15 is 0.1% taller than 285/35R21. That is inside the ±3% most shops treat as a straight swap. 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 60.0 mph if the speedometer was set up for 285/35R21. Going the other way, 285/35R21 would make it read 60.0 mph at a real 60.

How much ground clearance does it change?

Half the diameter difference: +0.01 in (+0 mm) under the axle.

Other comparisons

225/55R19 vs 285/35R21 275/45R19 vs 285/35R21 245/35R21 vs 285/35R21 285/35R21 vs 255/40R21 285/35R21 vs 265/40R21 275/35R21 vs 285/35R21 285/35R21 vs 275/45R21 285/35R21 vs 295/35R21 285/35R21 vs 235/70R16 215/75R15 vs 235/75R15 225/70R15 vs 235/75R15 225/75R15 vs 235/75R15 235/75R15 vs 255/70R15 235/75R15 vs 30x9.50R15 215/70R15 vs 235/75R15 235/75R15 vs 31x10.50R15 235/75R15 vs 235/70R16 225/55R19 vs 235/75R15