This specially engineered aero seat clamp suits Columbus Altec 2 + crono seat tubes. With 3 separate pieces to independantly slide on each other, this clamp will hold your seat post tight. We suggest you use with Columbus XLR8R carbon seat post. Available  Product Details...

Columbus XLR8R seat post with anti-compression channel. available in 27.2 or 31.6mm diameters.  Product Details...

Double allen key and splined, For traditional frames, Chrome plated  Product Details...

Seat bolt allen key 5mm.  Product Details...

seat clamp rotating nut 28.6mm black. This clamp allows you to tighten the bolt without it bending and breaking. simple but a great idea.  Product Details...

X Carbon seat clamp Available in: * 31.8mm * 34.8mm Designed for use with Carbon or alloy seat posts. The specially designed sleeve can be dialed to suit carbon or alloy posts. this will help creating a stress area for a ptential beakage o  Product Details...