You're looking at a braze-on adaptor for a front derailleur. It allows you to use either Shimano or Campagnolo braze-on front derailleurs on a frame that doesn''t have the appropriate mounts.
Must use slotted type front derailleurs
Available in 28.6, 31.8 and 34.9 clamp sizes
Specifications
Derailleur Clamp
28.6mm, 31.8mm, 34.9mm
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Customer Questions
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asked by: a guest Will this work with sram red front derailleur?
A.
anwered by: canteau The Problem Solvers Braze-on Adaptor Clamp will work with the SRAM Red front derailleur, if you have the version with the ChainSpotter and want to use it, you will need to get the SRAM adaptor clamp.
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I emailed specific pre-sale question to Problem Solvers & received quick, detailed info in reply; representative even followed up with a custom photo to demonstrate. (This is a GREAT manufacturer!)
This unit does precisely what it's intended to do, looks great and build quality is high.
What's not to like?