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Tire Size Comparison

225/65R17 vs 245/70R16

Switching from 225/65R17 to 245/70R16 changes overall diameter by +3.47% (28.52 in → 29.50 in).

+3.47%Borderline — noticeable speedometer/odometer error

Speedometer error

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

Speedo showsTrue speedSpeedo showsTrue speed
40 km/h41.4 km/h25 mph26 mph
60 km/h62.1 km/h37 mph39 mph
80 km/h82.8 km/h50 mph51 mph
100 km/h103.5 km/h62 mph64 mph
120 km/h124.2 km/h75 mph77 mph

Full comparison

225/65R17
Overall diameter724.3 mm · 28.52 in
Section width225 mm · 8.86 in
Sidewall height146.3 mm · 5.76 in
Circumference2275.5 mm · 89.6 in
Revolutions per mile707
Revolutions per km439
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
+3.47%Borderline — noticeable speedometer/odometer error
28.529.5
Original
Overall diameter724.3 mm · 28.52 in
Sidewall height146.3 mm
Circumference2,275.5 mm
Revolutions / mile707.3
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 +3.47%. 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/h41.4 km/h25 mph26 mph
60 km/h62.1 km/h37 mph39 mph
80 km/h82.8 km/h50 mph51 mph
100 km/h103.5 km/h62 mph64 mph
120 km/h124.2 km/h75 mph77 mph

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