235/70R16 vs 225/75R16

Q: Can I replace 235/70R16 with 225/75R16?

225/75R16 is a safe swap for 235/70R16 by the usual ±3% rule: the diameter differs by +1.16%.

225/75R16 is a safe swap for 235/70R16 by the usual ±3% rule: the diameter differs by +1.16%.

235/70R16 28.95" · 225/75R16 29.29" · drawn to scale

Side by side

	235/70R16	225/75R16	Difference
Overall diameter	28.95"	29.29"	+0.33" (+1.16%)
Section width	235 mm	225 mm	-10 mm
Sidewall	6.48"	6.64"	+0.17"
Rim	16"	16"	same
Circumference	91.0"	92.0"	+1.1"
Revs per mile	697	689	-8
Ride height	—	—	+0.17"
Speedometer reads 60 mph	60.0	60.7	+0.7 mph

Speedometer and odometer

With 225/75R16 on a car calibrated for 235/70R16, the speedometer reads 59.3 mph when you're really doing 60, and the odometer under-counts by 1.2%.

Speedo shows	Actual speed
30 mph	30.3 mph
45 mph	45.5 mph
60 mph	60.7 mph
70 mph	70.8 mph
80 mph	80.9 mph

Other sizes close to 235/70R16

Questions

Can I replace 235/70R16 with 225/75R16?

225/75R16 is a safe swap for 235/70R16 by the usual ±3% rule: the diameter differs by +1.16%.

What's the difference between 235/70R16 and 225/75R16?

225/75R16 is 0.33" taller and 10 mm narrower; the sidewall is +0.17". At an indicated 60 mph you'd actually be doing 60.7 mph.

Will 225/75R16 fit on 235/70R16 wheels?

Both use a 16" rim, so the wheel diameter matches; check the wheel's width range for a 225 mm tire and the fender clearance.