CarSpecsHQ

235/75R15 vs 235/70R16

235/70R16 is a safe swap for 235/75R15 by the usual ±3% rule: the diameter differs by +0.26%.

15" → 16"
235/75R15 28.88" · 235/70R16 28.95" · drawn to scale

Side by side

235/75R15235/70R16Difference
Overall diameter28.88"28.95"+0.07" (+0.26%)
Section width235 mm235 mm0 mm
Sidewall6.94"6.48"-0.46"
Rim15"16"+1"
Circumference90.7"91.0"+0.2"
Revs per mile698697-2
Ride height——+0.04"
Speedometer reads 60 mph60.060.2+0.2 mph

Speedometer and odometer

020406080100120 reads 60 · actual 60.2 mph

With 235/70R16 on a car calibrated for 235/75R15, the speedometer reads 59.8 mph when you're really doing 60, and the odometer under-counts by 0.3%.

Speedo showsActual speed
30 mph30.1 mph
45 mph45.1 mph
60 mph60.2 mph
70 mph70.2 mph
80 mph80.2 mph

Other sizes close to 235/75R15

Questions

Can I replace 235/75R15 with 235/70R16?

235/70R16 is a safe swap for 235/75R15 by the usual ±3% rule: the diameter differs by +0.26%.

What's the difference between 235/75R15 and 235/70R16?

235/70R16 is 0.07" taller and 0 mm wider; the sidewall is -0.46". At an indicated 60 mph you'd actually be doing 60.2 mph.

Will 235/70R16 fit on 235/75R15 wheels?

No — 235/75R15 needs a 15" wheel and 235/70R16 a 16" wheel. This is a plus/minus-size swap that changes wheels too.