The Trivio seatpost clamp ensures a firm fixation of the seatpost into the bicycle frame. This CNC'd aluminum version has been cut on both sides to save weight. It has an inner diameter of 31.8mm that is compatible with standard seatposts of 27.2mm. The clamp bolt should be tightened with a torque of 4Nm. This clamp is not only doing a perfect job but provides your bike with aesthetic value. Details make a difference.