Shimano Front Derailleur Seat Tube Shims
- Derailleur = the size of the clamp on the front derailleur you have
- Frame = the size of the seat tube the derailleur plus shim will fit
- Front Derailleur Clamp: 31.8 (1-1/4")
- Front Derailleur Clamp: 34.9 (1-3/8")
- Weight: 4