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Tire Size Comparison

205/70R15 vs 235/60R16

Switching from 205/70R15 to 235/60R16 changes overall diameter by +3.05% (26.30 in → 27.10 in).

+3.05%Borderline — noticeable speedometer/odometer error

Speedometer error

With a speedometer calibrated to 205/70R15, fitting 235/60R16 makes it read as follows:

Speedo showsTrue speedSpeedo showsTrue speed
40 km/h41.2 km/h25 mph26 mph
60 km/h61.8 km/h37 mph38 mph
80 km/h82.4 km/h50 mph51 mph
100 km/h103.1 km/h62 mph64 mph
120 km/h123.7 km/h75 mph77 mph

Full comparison

205/70R15
Overall diameter668.0 mm · 26.30 in
Section width205 mm · 8.07 in
Sidewall height143.5 mm · 5.65 in
Circumference2098.6 mm · 82.6 in
Revolutions per mile767
Revolutions per km477
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
Original tire
New tire
+3.05%Borderline — noticeable speedometer/odometer error
26.327.1
Original
Overall diameter668 mm · 26.3 in
Sidewall height143.5 mm
Circumference2,098.6 mm
Revolutions / mile766.9
New
Overall diameter688.4 mm · 27.1 in
Sidewall height141 mm
Circumference2,162.7 mm
Revolutions / mile744.1
Speedometer & odometer error

The new tire changes overall diameter by +3.05%. 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/h41.2 km/h25 mph26 mph
60 km/h61.8 km/h37 mph38 mph
80 km/h82.4 km/h50 mph51 mph
100 km/h103.1 km/h62 mph64 mph
120 km/h123.7 km/h75 mph77 mph

See individual specs: 205/70R15 · 235/60R16. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.