Shimano M971/980 Front Derailleur Shim
Shimano M971/980 Front Derailleur Shim You may need a shim to get your XTR M971/980 front derailleur to work on a bike with different size seat tube. If so, the Shimano M971/980 Front Derailleur Shim is the part you need. It installs around the seat tube, beneath the derailleur clamp, and allows the clamp to fit correctly. Shimano M971/980 Front Derailleur Shim Specifications: Front derailleur clamp area: 31.8mm (1-1/4") Derailleur clamp size: 34.9mm Weight: 4 grams