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Tire Size Comparison

265/70R16 vs 265/70R17

Switching from 265/70R16 to 265/70R17 changes overall diameter by +3.27% (30.61 in → 31.61 in).

+3.27%Borderline — noticeable speedometer/odometer error

Speedometer error

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

Speedo showsTrue speedSpeedo showsTrue speed
40 km/h41.3 km/h25 mph26 mph
60 km/h62.0 km/h37 mph39 mph
80 km/h82.6 km/h50 mph51 mph
100 km/h103.3 km/h62 mph64 mph
120 km/h123.9 km/h75 mph77 mph

Full comparison

265/70R16
Overall diameter777.4 mm · 30.61 in
Section width265 mm · 10.43 in
Sidewall height185.5 mm · 7.30 in
Circumference2442.3 mm · 96.2 in
Revolutions per mile659
Revolutions per km409
265/70R17
Overall diameter802.8 mm · 31.61 in
Section width265 mm · 10.43 in
Sidewall height185.5 mm · 7.30 in
Circumference2522.1 mm · 99.3 in
Revolutions per mile638
Revolutions per km396
Original tire
New tire
+3.27%Borderline — noticeable speedometer/odometer error
30.631.6
Original
Overall diameter777.4 mm · 30.61 in
Sidewall height185.5 mm
Circumference2,442.3 mm
Revolutions / mile659
New
Overall diameter802.8 mm · 31.61 in
Sidewall height185.5 mm
Circumference2,522.1 mm
Revolutions / mile638.1
Speedometer & odometer error

The new tire changes overall diameter by +3.27%. 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/h41.3 km/h25 mph26 mph
60 km/h62 km/h37 mph39 mph
80 km/h82.6 km/h50 mph51 mph
100 km/h103.3 km/h62 mph64 mph
120 km/h123.9 km/h75 mph77 mph

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