https://www.ridewill.com/p/en/shimano-sh-ismad91ms-clamp-adapter-dura-ace-318-286mm-fo-fd-r9150/543856/
DriveTrain Front Derailleurs Spare Parts and Collars for Derailleurs
Front Derailleurs Spare Parts and Collars for Derailleurs
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Shipping costs: 5.90
Suitable for the installation of Shimano braze-on derailleurs on frames that need a clamp, the DURA-ACE SM-AD91 is available in sizes from 34.9 and 28.6 / 31.8 mm.
- Clamp diameter: 31.8 mm
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