You are reading a single comment by @Fibreglass and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
@Fibreglass
I discovered that I don't actually need to drill a hole into the down tube: like some Cannondales from the mid-90s apparently, the shifter bosses, rather than being brazed on, are threaded into one another like a seat binder bolt. This means I was able to just unscrew them from the frame, conveniently leaving a 7.5 mm hole on either side of the down tube.
This is nice because I was starting to get a bit antsy about the potential long-term effects of drilling a large hole into 25-year-old aluminium. For this reason, I decided to not drill into the chain stay; instead, I enlarged the preexisting hole in the bottom bracket shell to create the exit point for the wire to the rear derailleur. I'll route the wire along the bottom of the stay and through the cable braze-on there, and then secure it in place with the external wiring kit that Shimano makes (electrical tape for now). I think it'll look fine, but if it doesn't, I can still revert to the initial plan of drilling the chain stay - all I'll have lost is the original BB cable guide mounting hole.
I will need to design and print some different Di2 wire grommets - I have the ones for 6 mm round holes and they won't fit the holes at either the down tube (too small) or the bottom bracket (too shallow).
2 Attachments