Question

what is 68 in 4 bit BCD

Answer 1

$Answer$

Luckily, it's possible to calculate the BCD of a chainring by simply measuring the center-to-center distance of two adjacent bolt holes. With this measurement ("B") you can refer to the table below to identify the corresponding BCD, or use one of the following equations: For 3-bolt chainrings: "A" = "B" x 1.155.

@Anirudh