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Tire Size Comparison

175/65R15 vs 195/65R15

Switching from 175/65R15 to 195/65R15 changes overall diameter by +4.27% (23.96 in → 24.98 in).

+4.27%Borderline — noticeable speedometer/odometer error

Speedometer error

With a speedometer calibrated to 175/65R15, fitting 195/65R15 makes it read as follows:

Speedo showsTrue speedSpeedo showsTrue speed
40 km/h41.7 km/h25 mph26 mph
60 km/h62.6 km/h37 mph39 mph
80 km/h83.4 km/h50 mph52 mph
100 km/h104.3 km/h62 mph65 mph
120 km/h125.1 km/h75 mph78 mph

Full comparison

175/65R15
Overall diameter608.5 mm · 23.96 in
Section width175 mm · 6.89 in
Sidewall height113.8 mm · 4.48 in
Circumference1911.7 mm · 75.3 in
Revolutions per mile842
Revolutions per km523
195/65R15
Overall diameter634.5 mm · 24.98 in
Section width195 mm · 7.68 in
Sidewall height126.8 mm · 4.99 in
Circumference1993.3 mm · 78.5 in
Revolutions per mile807
Revolutions per km502
Original tire
New tire
+4.27%Borderline — noticeable speedometer/odometer error
2425
Original
Overall diameter608.5 mm · 23.96 in
Sidewall height113.8 mm
Circumference1,911.7 mm
Revolutions / mile841.9
New
Overall diameter634.5 mm · 24.98 in
Sidewall height126.8 mm
Circumference1,993.3 mm
Revolutions / mile807.4
Speedometer & odometer error

The new tire changes overall diameter by +4.27%. 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/h41.7 km/h25 mph26 mph
60 km/h62.6 km/h37 mph39 mph
80 km/h83.4 km/h50 mph52 mph
100 km/h104.3 km/h62 mph65 mph
120 km/h125.1 km/h75 mph78 mph

See individual specs: 175/65R15 · 195/65R15. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.