Taking advantage of the new shimano di2 platform and the road version of hyperglide+ technology, the ultegra r8150 front derailleur shifts from one chainring to another with extreme speed and smoothness. Our fastest front shifters: 45% faster than the FD-R9150 front derailleur Smaller, sleeker, lighter 33% less front surface area Weight reduced to 116g Large chainring capacity: 50-52 teeth Mounting Type: Braze-on Pull type: - Packaging: Individually wrapped