Hi Boffin,
There are several triangular linkages in use. The standard ring kit delivered with the spring/summer 2018 kits has 138.14mm and the calculation is explained in this Wiki topic.
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Hi Boffin,
There are several triangular linkages in use. The standard ring kit delivered with the spring/summer 2018 kits has 138.14mm and the calculation is explained in this Wiki topic.