K-Edge SL-2 Chain Catcher SRAM
The K-Edge Braze-on Chain Catcher is made specifically for braze-on front derailleur tabs. What this really means is that you need to use either a braze-on front derailleur, or a clamp-on front derailleur that does NOT have an integrated clamp (i.e. it's a braze-on front derailleur mated to an adapter clamp.) It's made from CNC-machined 6061 T6 aluminum in Boise, ID. It weighs 10g and is available in Black/Gold and Red/Blue. It comes with 2 mounting bolts. 20mm for Shimano or Campagnolo, and a 25mm for SRAM. It's worth noting, too, that the instructions are phenomenal.