Senior Member
Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,089
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4206 Post(s)
Can't answer the cable routing around the BB, suspect that will depend on the BB used. Classic loose balls cups with a tapered square spindle leave a lot of room to work with. A modern cartridge unit, like a UN-55, much less room. Also can't answer about the junction box. Perhaps a call to Shimano would get more advice.
But the removal of braze one and the drilling (with reinforcement rings, some use water bottle bosses for this) is pretty straight forward. I wouldn't be too worried about the ports weakening the tubes, after all frames have holes in them already. Again some reinforcement is a good thing to do. No reason that the rear der wire could be routed internal in the chain stays.
Or just wait for the wireless versions to come out. Likely won't be more then a year or three... Andy.