NX 1x Rear Derailleur Dura-Ace Di2 durable Velcro loop and straps

durable Velcro loop and straps for attaching to seat post and seat rails

the B17 Short

it's too big

Revelation before model year 2009

Ensure you train in a clean and healthy environment

NX 1x Rear Derailleur Dura-Ace Di2 durable Velcro loop and strapsThe SRAM NX X HORIZON rear derailleur provides the same smooth, reliable shifting action as XX1 from the larger upper pulley offset to the 12 tooth X SYNC pulley wheels. By eliminating unwanted chain movement, X HORIZON shifts faster, puts an end to ghost shifting and reduces shift force and chain slap. And with CAGE LOCK technology, wheel removal and installation are easier than ever.