SM-AD91-MS Front Derailleur Clamp Size:28.6mm-31.8mm making it a favorite not

making it a favorite not only for track racers but also for BMX racing

Heavy duty AL6061-T6 alloy construction supports up to 55lbs

Small: 26" Double-walled alloy rims for a stable

Modern Style: Sleek black color complements any bike while providing practical functionality

The InSet™ 1 is part of the Chris King InSet™ family

SM-AD91-MS Front Derailleur Clamp Size:28.6mm-31.8mm making it a favorite notSM AD91 MS DURA ACE DI2 Front Derailleur Clamp Band Adapter 28. 6 31. 8 mm For installing SHIMANO braze on front derailleurs to frames requiring a band clamp, the DURA ACE SM AD91 is available in 34. 9, and 28. 6 31. 8mm sizes. Clamp band diameter: 31. 8 28. 6* mm, * with multi clamp band