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Tire Size Comparison

225/70R16 vs 245/70R16

Switching from 225/70R16 to 245/70R16 changes overall diameter by +3.88% (28.40 in → 29.50 in).

+3.88%Borderline — noticeable speedometer/odometer error

Speedometer error

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

Speedo showsTrue speedSpeedo showsTrue speed
40 km/h41.6 km/h25 mph26 mph
60 km/h62.3 km/h37 mph39 mph
80 km/h83.1 km/h50 mph52 mph
100 km/h103.9 km/h62 mph65 mph
120 km/h124.7 km/h75 mph77 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
245/70R16
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
+3.88%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 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 +3.88%. 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/h62.3 km/h37 mph39 mph
80 km/h83.1 km/h50 mph52 mph
100 km/h103.9 km/h62 mph65 mph
120 km/h124.7 km/h75 mph77 mph

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