Shimano Ultegra Di2 6770 Braze-On Adapter 28.6/31.8mm
Ultegra Di2 front derailleurs are only offered in a braze on mount. The Di2 6770 Braze-On Adapters are made from quality aluminum with a steel nut and bolt for clamping. They are available in 28.6mm, 31.8mm, and 34.9 mm so all frame sizes are accounted for.
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