225/70R15 vs 195/75R16

Q: Can I replace 225/70R15 with 195/75R16?

195/75R16 is a safe swap for 225/70R15 by the usual ±3% rule: the diameter differs by +0.42%.

195/75R16 is a safe swap for 225/70R15 by the usual ±3% rule: the diameter differs by +0.42%.

225/70R15 27.40" · 195/75R16 27.52" · drawn to scale

Side by side

	225/70R15	195/75R16	Difference
Overall diameter	27.40"	27.52"	+0.11" (+0.42%)
Section width	225 mm	195 mm	-30 mm
Sidewall	6.20"	5.76"	-0.44"
Rim	15"	16"	+1"
Circumference	86.1"	86.4"	+0.4"
Revs per mile	736	733	-3
Ride height	—	—	+0.06"
Speedometer reads 60 mph	60.0	60.3	+0.3 mph

Speedometer and odometer

With 195/75R16 on a car calibrated for 225/70R15, the speedometer reads 59.8 mph when you're really doing 60, and the odometer under-counts by 0.4%.

Speedo shows	Actual speed
30 mph	30.1 mph
45 mph	45.2 mph
60 mph	60.3 mph
70 mph	70.3 mph
80 mph	80.3 mph

Other sizes close to 225/70R15

Questions

Can I replace 225/70R15 with 195/75R16?

195/75R16 is a safe swap for 225/70R15 by the usual ±3% rule: the diameter differs by +0.42%.

What's the difference between 225/70R15 and 195/75R16?

195/75R16 is 0.11" taller and 30 mm narrower; the sidewall is -0.44". At an indicated 60 mph you'd actually be doing 60.3 mph.

Will 195/75R16 fit on 225/70R15 wheels?

No — 225/70R15 needs a 15" wheel and 195/75R16 a 16" wheel. This is a plus/minus-size swap that changes wheels too.