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Tire Size Comparison

285/70R17 vs 265/75R16

Switching from 285/70R17 to 265/75R16 changes overall diameter by -3.24% (32.71 in → 31.65 in).

-3.24%Borderline — noticeable speedometer/odometer error

Speedometer error

With a speedometer calibrated to 285/70R17, fitting 265/75R16 makes it read as follows:

Speedo showsTrue speedSpeedo showsTrue speed
40 km/h38.7 km/h25 mph24 mph
60 km/h58.1 km/h37 mph36 mph
80 km/h77.4 km/h50 mph48 mph
100 km/h96.8 km/h62 mph60 mph
120 km/h116.1 km/h75 mph72 mph

Full comparison

285/70R17
Overall diameter830.8 mm · 32.71 in
Section width285 mm · 11.22 in
Sidewall height199.5 mm · 7.85 in
Circumference2610.0 mm · 102.8 in
Revolutions per mile617
Revolutions per km383
265/75R16
Overall diameter803.9 mm · 31.65 in
Section width265 mm · 10.43 in
Sidewall height198.8 mm · 7.82 in
Circumference2525.5 mm · 99.4 in
Revolutions per mile637
Revolutions per km396
Original tire
New tire
-3.24%Borderline — noticeable speedometer/odometer error
32.731.6
Original
Overall diameter830.8 mm · 32.71 in
Sidewall height199.5 mm
Circumference2,610 mm
Revolutions / mile616.6
New
Overall diameter803.9 mm · 31.65 in
Sidewall height198.8 mm
Circumference2,525.5 mm
Revolutions / mile637.2
Speedometer & odometer error

The new tire changes overall diameter by -3.24%. With a speedometer calibrated to the original tire, that same percentage is how far the speedometer and odometer read off — a taller tire means your true speed is higher than indicated and the odometer under-counts distance.

Speedo showsTrue speedSpeedo showsTrue speed
40 km/h38.7 km/h25 mph24 mph
60 km/h58.1 km/h37 mph36 mph
80 km/h77.4 km/h50 mph48 mph
100 km/h96.8 km/h62 mph60 mph
120 km/h116.1 km/h75 mph72 mph

See individual specs: 285/70R17 · 265/75R16. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.