CarSpecsHQ

215/75R15 vs 235/75R15

235/75R15 is outside the ±3% rule as a replacement for 215/75R15: the diameter differs by +4.26%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.

15" rim
215/75R15 27.70" · 235/75R15 28.88" · drawn to scale

Side by side

215/75R15235/75R15Difference
Overall diameter27.70"28.88"+1.18" (+4.26%)
Section width215 mm235 mm+20 mm
Sidewall6.35"6.94"+0.59"
Rim15"15"same
Circumference87.0"90.7"+3.7"
Revs per mile728698-30
Ride height——+0.59"
Speedometer reads 60 mph60.062.6+2.6 mph

Speedometer and odometer

020406080100120 reads 60 · actual 62.6 mph

With 235/75R15 on a car calibrated for 215/75R15, the speedometer reads 57.5 mph when you're really doing 60, and the odometer under-counts by 4.3%.

Speedo showsActual speed
30 mph31.3 mph
45 mph46.9 mph
60 mph62.6 mph
70 mph73.0 mph
80 mph83.4 mph

Other sizes close to 215/75R15

Questions

Can I replace 215/75R15 with 235/75R15?

235/75R15 is outside the ±3% rule as a replacement for 215/75R15: the diameter differs by +4.26%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.

What's the difference between 215/75R15 and 235/75R15?

235/75R15 is 1.18" taller and 20 mm wider; the sidewall is +0.59". At an indicated 60 mph you'd actually be doing 62.6 mph.

Will 235/75R15 fit on 215/75R15 wheels?

Both use a 15" rim, so the wheel diameter matches; check the wheel's width range for a 235 mm tire and the fender clearance.