Bicycle Mechanics - Shifter cable routing

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orangepaint
09-11-07, 03:04 PM
So I am building up a classic frame into a modern roadie with campy ergo shifters. I was wondering if the different cable routing on vintage frames(cable running above bottom bracket instead of under) would affect the indexed shifting and if so, what an effective solution would be to this problem.

roadfix
09-11-07, 03:10 PM
It shouldn't make any difference. There's probably just as much cable friction under the BB shell compared to anywhere else.
p4nh4ndle
09-11-07, 04:21 PM
hide a small piece of lined housing under the bb shell guides? or triflow

Michel Gagnon
09-11-07, 07:39 PM
It will be OK indeed. In fact, the old above-BB routing is slightly better than the current routing, because the cable gets less dirty and the rear loop is less tight. So why all current bikes have under-the-BB routing? Two reasons:
1. Prettier
2. With tiny chainrings à la mountain bike, it allows one to place the derailleur a few millimetres further down.