These adapters clamp on to the seat tube so you can use your braze-on derailleur on a conventional frame. Available in three common seat tube sizes with 20mm of vertical adjustability.
Problem Solvers makes two different Cable Doublers. This one allows you to control two brakes with just one lever. Why? Well, there are myriad applications: cyclocross, fixies, tandems, bike polo, tricycles, recumbents, cycles for those with special needs, those four-person bikes you see on beach boulevards, and so on. You could even link them both together for ultimate redundancy!
Mounting electronic shifting systems challenges the most prolific of bike mechanics. When small frames, recumbents, or adaptive cycles are involved, the standard battery mounts don't accommodate. This mount accepts the small Di2 or EPS battery mounts and comes with zip ties to attach that battery anywhere on the frame you need it.
These handy little adjusters mount to frames with downtube mounts for road shifting systems.