SM-AD91-MS Front Derailleur Clamp Size:28.6mm-31.8mm Spoke bed diameter (ERD) 650C:

Spoke bed diameter (ERD) 650C: 551 mm

With its sleek diamond frame

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

Saddle: Ergonomic black leatherette saddle for comfort on long rides

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

SM-AD91-MS Front Derailleur Clamp Size:28.6mm-31.8mm Spoke bed diameter (ERD) 650C:SM 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