The same width as the 11 Speed ??sprocket cassette Total compatibility with wheels and frames. The two largest triplets in a single piece Eliminates energy losses. Surface treatment Increases durability and improves smoothness Matching-thickness spacers Facilitates installation by eliminating the possibility of error Two selections available Increases the range of action thanks to the complete range of metric developments Compatibility Same overall dimensions as the 11 Speed; there are no wheels to change or update. Reduced spaces Faster and more precise shifting. Same spacers Easy installation without risk of error. Larger triplets in a single block Rigidity and elimination of losses.