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How can I define ratio K on the XR2Axx position selector gearbox?

Assuming you know the difference, or the length to be checked, choose a pinion from the offer and apply the following formula:
Say we take a length to be checked of 8 metres and a cog with 36 teeth, then:
  • length to be checked = number of teeth x chain pitch,
  • 8000 mm divided by 36 teeth x 12.7 mm,
  • 8000: 457.20 = 17.49,
giving a ratio K = 20
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