Shimano FD-R8150 Front DerailleurShimano Ultegra Di2 Front Derailleur Combining Shimano's new Di2 platform and the road incarnation of HYPERGLIDE+, the Ultegra FD R8150 front derailleur shifts with our fastest, most seamless action. Top gear teeth capacity: 46 52T Compatibility: Shimano 12 speed Di2 road systems
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