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Technical FAQ: Installing electronic shifting on a bike without internal cable routing

A standard 8-by-7mm Shimano grommet on the seat tube for an Ultegra Di2 front derailleur wire.  Photo: Lennard Zinn | VeloNews.com

A standard 8-by-7mm Shimano grommet on the seat tube for an Ultegra Di2 front derailleur wire. Photo: Lennard Zinn | VeloNews.com