Salsa Guide Carbon Seatpost 31.6 x 400mm 0mm Offset BlackSalsa Guide Carbon Seatpost 31. 6 x 400mm 0mm Offset Black. The Guide Carbon Seatpost features a highly adjustable two bolt head design while remaining lightweight durable and supportive when you need it most. Unidirectional carbon fiber shaft Bonded Aluminum two bolt adjustable head TECH SPECS Length 400 Color Black Weight 283 Diameter 31. 6 Material Carbon Defined Color Black Clamp Style Standard Rails Offset (mm) 0