This Shimano Front Derailleur Adapter allows Dura Ace Di2 9150 front derailleurs to be mounted on frames that don’t have braze-on mounts built in. The clamp is available in various sizes for compatibility with various seat tube diameters.
Specifications
| SM-AD91 Adapter – 34.9mm | Mfg PartNum: ISMAD91L |
| SM-AD91 Adapter – 31.8mm w/28.6 Adapter | Mfg PartNum: ISMAD91MS |










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