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Tire Size Comparison

245/75R16 vs 265/70R17

Switching from 245/75R16 to 265/70R17 changes overall diameter by +3.73% (30.47 in → 31.61 in).

+3.73%Borderline — noticeable speedometer/odometer error

Speedometer error

With a speedometer calibrated to 245/75R16, fitting 265/70R17 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

245/75R16
Overall diameter773.9 mm · 30.47 in
Section width245 mm · 9.65 in
Sidewall height183.8 mm · 7.23 in
Circumference2431.3 mm · 95.7 in
Revolutions per mile662
Revolutions per km411
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
+3.73%Borderline — noticeable speedometer/odometer error
30.531.6
Original
Overall diameter773.9 mm · 30.47 in
Sidewall height183.8 mm
Circumference2,431.3 mm
Revolutions / mile661.9
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 +3.73%. 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: 245/75R16 · 265/70R17. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.