The weight optimised 612 Ergowave Carbon was specifically designed to accomodate the requirements of both competetive and leisure cyclists both on the road or mountainbike. With 147g it is the lightest 612 Ergowave model. The wave-like shape and raised rear section provides perfect rearward support and an optimal pressure distribution which reaches deep into the body structures resulting in improved power transmission. The lowered nose in combination with the dip provides optimal pressure relief for the perineal area. The flat but slim SQlab MaxContact saddle nose and the firm padding of the 612 were both specifically designed for the needs on the roadbike. Note on compatability of carbon rails Ensure that the seatrail clamping mechanism of your seatpost is compatible with oval shaped seatrails. In some cases, specific seatrail clamps are available seperately to allow the fitting of saddles with oval shaped rails. In the case of the *Ritchey WCS 1 Bolt Mast Topper the item that you would need is the 1 Bolt Clamp Kit 7x9.6mm denoted by the letters Area of use Road MTB Race Length mm 275 Material Rails Carbon fibre oval shape 7 x 9.6 mm Material Cover C84 Kevlar max. Weight kg 90