Ritchey superlogic carbon seat post 1 bolt the ritchey superlogic carbon seat post features a simple 1 bolt clamp design and offers you simple installation, smooth adjustment and elegant looks. It provides optimal strength to weight ratio and as part of ritchey's ldquosuperlogicrdquo range, it's designed for use on top of the line bikes where every gram and every second gained really matters.features  material high modulus carbon constructed using lct  finish matt ud carbon  sidebinder clamp technology single 5mm allen key for installation and all adjustments  adjustable rail clamps provide compatibility with a range of saddle rails  cradle 43x38mm  offset 25mm  weight 148g 27.2x300mmbuy ritchey components from chain reaction cycles, the world's largest online bike store.