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Tire Size Comparison

265/75R16 vs 285/75R16

Switching from 265/75R16 to 285/75R16 changes overall diameter by +3.73% (31.65 in → 32.83 in).

+3.73%Borderline — noticeable speedometer/odometer error

Speedometer error

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

Speedo showsTrue speedSpeedo showsTrue speed
40 km/h41.5 km/h25 mph26 mph
60 km/h62.2 km/h37 mph39 mph
80 km/h83.0 km/h50 mph52 mph
100 km/h103.7 km/h62 mph64 mph
120 km/h124.5 km/h75 mph77 mph

Full comparison

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
285/75R16
Overall diameter833.9 mm · 32.83 in
Section width285 mm · 11.22 in
Sidewall height213.8 mm · 8.42 in
Circumference2619.8 mm · 103.1 in
Revolutions per mile614
Revolutions per km382
Original tire
New tire
+3.73%Borderline — noticeable speedometer/odometer error
31.632.8
Original
Overall diameter803.9 mm · 31.65 in
Sidewall height198.8 mm
Circumference2,525.5 mm
Revolutions / mile637.2
New
Overall diameter833.9 mm · 32.83 in
Sidewall height213.8 mm
Circumference2,619.8 mm
Revolutions / mile614.3
Speedometer & odometer error

The new tire changes overall diameter by +3.73%. 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/h41.5 km/h25 mph26 mph
60 km/h62.2 km/h37 mph39 mph
80 km/h83 km/h50 mph52 mph
100 km/h103.7 km/h62 mph64 mph
120 km/h124.5 km/h75 mph77 mph

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