Shimano Ultegra FD-R8150 Di2 12-speed Front Derailleur

Combines the Di2 platform and the road incarnation of HYPERGLIDE+
Offers 45% faster shifting than the Dura-Ace FD-R9150 Di2 front derailleur
Smaller, sleeker and lighter than previous models: frontal area reduced by 33% and weight cut to 116 g
Top gear teeth capacity: 50–54T