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Problem Solvers Braze-On Front Derailleur Adapter 28.6mm, Silver

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.
DP0910

Problem Solvers Cable Doubler 1:2

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!
BR3341

Problem Solvers Di2 Battery Mount

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.
CY0900

Problem Solvers Double Barrel Brake Levers, Right

Designed for use with long-pull brakes, the Double Barrel levers allow two brakes to be actuated with one hand.
BR2902

Problem Solvers Downtube Shift Cable Adjusters, Stainless Steel

These handy little adjusters mount to frames with downtube mounts for road shifting systems.
FS0069

Problem Solvers Mismatch 2.0 Adapter Pair, Black

Problem Solvers MisMatch Adaptor 2, fits Avid MatchMaker Brakes to Shimano I-Spec Shifters.
BR0387