New Shimano 105 is new for 2011 and incorporates many of the benefits that were originally developed for Dura Ace 7900 series and integrated into Ultegra 6700 series. The new group is available in Sterling Silver for a classic road cosmetic or Lodestar Black for a more contemporary look. Overall, performance and durability is enhanced while the entire group manages to drop almost 30 grams from the prior generation. Shimanos proprietary HOLLOWTECH II design provides an optimum balance of light weight and stiffness, while Dual SIS front index shifting has long been the industry benchmark for instantaneous and assertive front shifting performance. Additional improvements include increased spacing between the inner and outer chainrings to reduce chain interference in cross chain situations. Available in double, triple, and compact chainring configurations: FC 5700: 52 39T, 53 39T FC 5703: 50 39 30T FC 5750: 50 34T.