Ritchey comp carbon seatpostbuilt to add efficiency, comfort and without adding unnecessary bulk to your bike, the comp carbon seatpost boasts ritcheys full carbon fibre shaft and strong and lightweight 6061 aluminium clamp head. This construction means less of your pedalling effort is wasted through unwanted flexing and sudden impacts and vibrations are dampened, so you can stay in control and enjoy the ride.carbon comp seatpost ready for action, ritchey has equipped this superb component with a unidirectional ud carbon finish which adds another layer of stiffness and durability to this already solid component. Furthermore, its two bolt clamping system is extra secure and easy to install, so you can put your trust in this dependable model on every journey.features material shaft carbon fibre clamp head 6061 aluminium finish unidirectional ud carbon offset 25mmdiameter separate 27.2mm and 31.6mm optionslength separate 350mm and 40mm optionsmininmum post insert in bike frame 100mm cradle 43x38mm bolt 2 boltsaddle clamp torque 13nm maximumseat collar torque 6nm maximum 7nm maximum for ritchey steel framesmanufacturer's part number 41036008001 weight 229g 27.2mm version approxbuy ritchey components from chain reaction cycles, the world's largest online bike store.