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Tire Size Comparison

265/70R16 vs 245/65R17

Switching from 265/70R16 to 245/65R17 changes overall diameter by -3.49% (30.61 in → 29.54 in).

-3.49%Borderline — noticeable speedometer/odometer error

Speedometer error

With a speedometer calibrated to 265/70R16, fitting 245/65R17 makes it read as follows:

Speedo showsTrue speedSpeedo showsTrue speed
40 km/h38.6 km/h25 mph24 mph
60 km/h57.9 km/h37 mph36 mph
80 km/h77.2 km/h50 mph48 mph
100 km/h96.5 km/h62 mph60 mph
120 km/h115.8 km/h75 mph72 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
245/65R17
Overall diameter750.3 mm · 29.54 in
Section width245 mm · 9.65 in
Sidewall height159.3 mm · 6.27 in
Circumference2357.1 mm · 92.8 in
Revolutions per mile683
Revolutions per km424
Original tire
New tire
-3.49%Borderline — noticeable speedometer/odometer error
30.629.5
Original
Overall diameter777.4 mm · 30.61 in
Sidewall height185.5 mm
Circumference2,442.3 mm
Revolutions / mile659
New
Overall diameter750.3 mm · 29.54 in
Sidewall height159.3 mm
Circumference2,357.1 mm
Revolutions / mile682.8
Speedometer & odometer error

The new tire changes overall diameter by -3.49%. 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/h38.6 km/h25 mph24 mph
60 km/h57.9 km/h37 mph36 mph
80 km/h77.2 km/h50 mph48 mph
100 km/h96.5 km/h62 mph60 mph
120 km/h115.8 km/h75 mph72 mph

See individual specs: 265/70R16 · 245/65R17. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.