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Tire Size Comparison

225/70R16 vs 245/65R17

Switching from 225/70R16 to 245/65R17 changes overall diameter by +4.01% (28.40 in → 29.54 in).

+4.01%Borderline — noticeable speedometer/odometer error

Speedometer error

With a speedometer calibrated to 225/70R16, fitting 245/65R17 makes it read as follows:

Speedo showsTrue speedSpeedo showsTrue speed
40 km/h41.6 km/h25 mph26 mph
60 km/h62.4 km/h37 mph39 mph
80 km/h83.2 km/h50 mph52 mph
100 km/h104.0 km/h62 mph65 mph
120 km/h124.8 km/h75 mph78 mph

Full comparison

225/70R16
Overall diameter721.4 mm · 28.40 in
Section width225 mm · 8.86 in
Sidewall height157.5 mm · 6.20 in
Circumference2266.3 mm · 89.2 in
Revolutions per mile710
Revolutions per km441
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
+4.01%Borderline — noticeable speedometer/odometer error
28.429.5
Original
Overall diameter721.4 mm · 28.4 in
Sidewall height157.5 mm
Circumference2,266.3 mm
Revolutions / mile710.1
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 +4.01%. 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/h41.6 km/h25 mph26 mph
60 km/h62.4 km/h37 mph39 mph
80 km/h83.2 km/h50 mph52 mph
100 km/h104 km/h62 mph65 mph
120 km/h124.8 km/h75 mph78 mph

See individual specs: 225/70R16 · 245/65R17. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.