Shimano Ultegra Compact Crankset (50/34)

Shimano's Ultegra Compact Crankset boasts hollow-forged-aluminum arms and a hollow aluminum big ring. These technologies combine for impressive weight savings and strength. An integrated-bottom-bracket-axle design provides super-efficient power transfer and chainrings with ramps, pins and notched teeth deliver super-fast shifting. Plus, the compact gearing lets you spin up hills.