60MM Speedo Odometer 2: 1.
With mounting bracket
R - 60mm and ratio 2: 1

Mechanical speedo with a black housing.
KM / H ratio 2: 1

Calculate your K-Value?

Example

K = 10 x number of revolutions of the km.teller cable / tire size in cm.

You can determine the number of revolutions of the km.teller cable: remove the km counter cable from the km counter. Put a paper clip on the square inner cable and turn the wheel exactly 10 times (note on the tire).

Meanwhile, count the number of revolutions that the paper clip / km.teller cable makes.
For example: 10 x 27.5 revolutions / 202 cm = 275/202 = 1.36 is rounded 1.4.