Design tooth crowns Ultra-Shift allowing for maximum performance in changing speed, precision and quiet.
The teeth are designed to optimize the speed and fluidity of change. With thus reduce stress by the chain which easily goes to the crowns of larger diameter. The larger crowns are divided into groups of three and mounted on an aluminum frame new concept. Thanks to this, the rigidity is increased to 180%, and each crown increases its torsional stiffness by 70%.
The last trio of crowns is mounted in a frame of new construction for added rigidity and reduce weight. The steel sprockets are surface treated with nickel-chrome.
Includes cover on lightweight aluminum.
231 g WEIGHT including cassette closing lid