Ritchey Stem Superlogic C260 6DProduct Details Ritcheys first full carbon stem was designed to meet the needs of high wattage European Classics specialists. The Carbon C260 adds to the amazing strength to weight ratio of our C260 alloy and Carbon Matrix stems through the use of high modulus carbon fiber, increased boom diameter and a wider clamp. Gram for gram this is the lightest, stiffest full carbon stem on the market, making it the most advanced Ritchey stem ever, and its ready