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Shimano AD17-M Front Derailleur Clamp Shim reduces 34.9mm to 31.8mm. Shimano Front Derailleur Seat Tube ShimsDerailleur = the size of the clamp on the front derailleur you have
Frame = the size of the seat tube the derailleur plus shim will fit
- TECH SPECS
| Weight | 4 |
| Front Derailleur Clamp | 31.8 (1-1/4") |
| Front Derailleur Clamp | 34.9 (1-3/8") |
