The Shimano Ultegra Di2 front derailleur is available in a braze-on style only. But, no worries if that's not how you roll, thanks to this handy clamp-on adapter. Elegantly anodized to match the sleek gray finish of the Ultegra Di2 front derailleur (and the rest of the Di2 goodies), it's available in 31.8mm and 34.9mm diameter versions.