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Tire Size Comparison

205/70R15 vs 215/55R16

Switching from 205/70R15 to 215/55R16 changes overall diameter by -3.76% (26.30 in → 25.31 in).

-3.76%Borderline — noticeable speedometer/odometer error

Speedometer error

With a speedometer calibrated to 205/70R15, fitting 215/55R16 makes it read as follows:

Speedo showsTrue speedSpeedo showsTrue speed
40 km/h38.5 km/h25 mph24 mph
60 km/h57.7 km/h37 mph36 mph
80 km/h77.0 km/h50 mph48 mph
100 km/h96.2 km/h62 mph60 mph
120 km/h115.5 km/h75 mph72 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
215/55R16
Overall diameter642.9 mm · 25.31 in
Section width215 mm · 8.46 in
Sidewall height118.3 mm · 4.66 in
Circumference2019.7 mm · 79.5 in
Revolutions per mile797
Revolutions per km495
Original tire
New tire
-3.76%Borderline — noticeable speedometer/odometer error
26.325.3
Original
Overall diameter668 mm · 26.3 in
Sidewall height143.5 mm
Circumference2,098.6 mm
Revolutions / mile766.9
New
Overall diameter642.9 mm · 25.31 in
Sidewall height118.3 mm
Circumference2,019.7 mm
Revolutions / mile796.8
Speedometer & odometer error

The new tire changes overall diameter by -3.76%. 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/h38.5 km/h25 mph24 mph
60 km/h57.7 km/h37 mph36 mph
80 km/h77 km/h50 mph48 mph
100 km/h96.2 km/h62 mph60 mph
120 km/h115.5 km/h75 mph72 mph

See individual specs: 205/70R15 · 215/55R16. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.