Keeps chain tight and prevents rear wheel from sliding forward in horizontal dropouts under pedaling load\n Lightweight aluminum with twin stainless steel bolts and locknuts\n 10mm holes for BMX (3/8") and Singlespeed applications (50g)
- model:
- ZN40
- description:
- bearing (49mm) 36x45 degree
- size:
- 1-3/8|each