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Tire Size Comparison

265/70R16 vs 245/70R16

Switching from 265/70R16 to 245/70R16 changes overall diameter by -3.60% (30.61 in → 29.50 in).

-3.60%Borderline — noticeable speedometer/odometer error

Speedometer error

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

Speedo showsTrue speedSpeedo showsTrue speed
40 km/h38.6 km/h25 mph24 mph
60 km/h57.8 km/h37 mph36 mph
80 km/h77.1 km/h50 mph48 mph
100 km/h96.4 km/h62 mph60 mph
120 km/h115.7 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
245/70R16
Overall diameter749.4 mm · 29.50 in
Section width245 mm · 9.65 in
Sidewall height171.5 mm · 6.75 in
Circumference2354.3 mm · 92.7 in
Revolutions per mile684
Revolutions per km425
Original tire
New tire
-3.6%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 diameter749.4 mm · 29.5 in
Sidewall height171.5 mm
Circumference2,354.3 mm
Revolutions / mile683.6
Speedometer & odometer error

The new tire changes overall diameter by -3.6%. 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/h57.8 km/h37 mph36 mph
80 km/h77.1 km/h50 mph48 mph
100 km/h96.4 km/h62 mph60 mph
120 km/h115.7 km/h75 mph72 mph

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