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Tire Size Comparison

235/60R16 vs 225/70R16

Switching from 235/60R16 to 225/70R16 changes overall diameter by +4.79% (27.10 in → 28.40 in).

+4.79%Borderline — noticeable speedometer/odometer error

Speedometer error

With a speedometer calibrated to 235/60R16, fitting 225/70R16 makes it read as follows:

Speedo showsTrue speedSpeedo showsTrue speed
40 km/h41.9 km/h25 mph26 mph
60 km/h62.9 km/h37 mph39 mph
80 km/h83.8 km/h50 mph52 mph
100 km/h104.8 km/h62 mph65 mph
120 km/h125.8 km/h75 mph78 mph

Full comparison

235/60R16
Overall diameter688.4 mm · 27.10 in
Section width235 mm · 9.25 in
Sidewall height141.0 mm · 5.55 in
Circumference2162.7 mm · 85.1 in
Revolutions per mile744
Revolutions per km462
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
Original tire
New tire
+4.79%Borderline — noticeable speedometer/odometer error
27.128.4
Original
Overall diameter688.4 mm · 27.1 in
Sidewall height141 mm
Circumference2,162.7 mm
Revolutions / mile744.1
New
Overall diameter721.4 mm · 28.4 in
Sidewall height157.5 mm
Circumference2,266.3 mm
Revolutions / mile710.1
Speedometer & odometer error

The new tire changes overall diameter by +4.79%. 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/h41.9 km/h25 mph26 mph
60 km/h62.9 km/h37 mph39 mph
80 km/h83.8 km/h50 mph52 mph
100 km/h104.8 km/h62 mph65 mph
120 km/h125.8 km/h75 mph78 mph

See individual specs: 235/60R16 · 225/70R16. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.