Porcia
Active Member
- Location
- Ashford Kent
SO I am looking to change the front chain wheels from 53/ 43 to 50 /38 as I is getting long in the tooth and hills a getting harder to climb. Every thing starts out fine measure the PCB or BCD 130mm not a problem but the strange flat headed Allen bolts holding the ring's to the crank are what look like imperial sizes, had to get my vernier and Zeus table out, turns out I need a 3/16 Allen key to remove them who'd have thought.