285/75R16 vs 255/80R17

Q: Can I replace 285/75R16 with 255/80R17?

255/80R17 is a safe swap for 285/75R16 by the usual ±3% rule: the diameter differs by +0.71%.

255/80R17 is a safe swap for 285/75R16 by the usual ±3% rule: the diameter differs by +0.71%.

285/75R16 32.83" · 255/80R17 33.06" · drawn to scale

Side by side

	285/75R16	255/80R17	Difference
Overall diameter	32.83"	33.06"	+0.23" (+0.71%)
Section width	285 mm	255 mm	-30 mm
Sidewall	8.42"	8.03"	-0.38"
Rim	16"	17"	+1"
Circumference	103.1"	103.9"	+0.7"
Revs per mile	614	610	-4
Ride height	—	—	+0.12"
Speedometer reads 60 mph	60.0	60.4	+0.4 mph

Speedometer and odometer

With 255/80R17 on a car calibrated for 285/75R16, the speedometer reads 59.6 mph when you're really doing 60, and the odometer under-counts by 0.7%.

Speedo shows	Actual speed
30 mph	30.2 mph
45 mph	45.3 mph
60 mph	60.4 mph
70 mph	70.5 mph
80 mph	80.6 mph

Other sizes close to 285/75R16

Questions

Can I replace 285/75R16 with 255/80R17?

255/80R17 is a safe swap for 285/75R16 by the usual ±3% rule: the diameter differs by +0.71%.

What's the difference between 285/75R16 and 255/80R17?

255/80R17 is 0.23" taller and 30 mm narrower; the sidewall is -0.38". At an indicated 60 mph you'd actually be doing 60.4 mph.

Will 255/80R17 fit on 285/75R16 wheels?

No — 285/75R16 needs a 16" wheel and 255/80R17 a 17" wheel. This is a plus/minus-size swap that changes wheels too.