Ritchey Wcs M-Topper 34.9X70 25-Sb Blk, 25Mm Offset 2D net forged 2014 alloy body with a 3D forged head design Patented 1-bolt clamp system makes seat installation and adjustment extremely simple Loosening one single bolt allows for both fore/aft and tilt adjustments Designed for frames with integrated seat tubes only 138 grams