235/65R17 vs 225/75R16

Q: Can I replace 235/65R17 with 225/75R16?

225/75R16 is a safe swap for 235/65R17 by the usual ±3% rule: the diameter differs by +0.90%.

225/75R16 is a safe swap for 235/65R17 by the usual ±3% rule: the diameter differs by +0.90%.

235/65R17 29.03" · 225/75R16 29.29" · drawn to scale

Side by side

	235/65R17	225/75R16	Difference
Overall diameter	29.03"	29.29"	+0.26" (+0.90%)
Section width	235 mm	225 mm	-10 mm
Sidewall	6.01"	6.64"	+0.63"
Rim	17"	16"	-1"
Circumference	91.2"	92.0"	+0.8"
Revs per mile	695	689	-6
Ride height	—	—	+0.13"
Speedometer reads 60 mph	60.0	60.5	+0.5 mph

Speedometer and odometer

With 225/75R16 on a car calibrated for 235/65R17, the speedometer reads 59.5 mph when you're really doing 60, and the odometer under-counts by 0.9%.

Speedo shows	Actual speed
30 mph	30.3 mph
45 mph	45.4 mph
60 mph	60.5 mph
70 mph	70.6 mph
80 mph	80.7 mph

Other sizes close to 235/65R17

Questions

Can I replace 235/65R17 with 225/75R16?

225/75R16 is a safe swap for 235/65R17 by the usual ±3% rule: the diameter differs by +0.90%.

What's the difference between 235/65R17 and 225/75R16?

225/75R16 is 0.26" taller and 10 mm narrower; the sidewall is +0.63". At an indicated 60 mph you'd actually be doing 60.5 mph.

Will 225/75R16 fit on 235/65R17 wheels?

No — 235/65R17 needs a 17" wheel and 225/75R16 a 16" wheel. This is a plus/minus-size swap that changes wheels too.