For a more aggressive riding position, or to simply counter balance a slacker seat tube, 3T's Ionic 0 seat post features the appropriate zero degree setback. It is lighter than a setback post and the saddle clamp has been reduced to a single bolt design for ease of use. 3T's Ionic 0 was constructed from a blend of lightweight and durable carbon and aluminum. For the shaft, 3T used ultra stiff carbon, which blends low weight, stiffness and comfort it's known for its road chatter dampening characteristics. Atop the post, 3T uses it sophisticated Difflock seat clamp. This is a single bolt clamp that is compatible with saddles that have 7mm round rails. The splined design of the clamp makes setting saddle angle and setback simple and requires only lightweight clamping. You won't need to torque down to ensure that your saddle won't slip. The 3T Ionic post comes in one color its stealthy black on black. It is available in three lengths: 280mm, 350mm. 420mm. Each length comes in either a 27. 2mm or 31. 6mm diameter.