LVWA full Carbon fiber road MTB mountain Bike Seatposts 400*31.6mm SP013L Fit, security, adjustability and lightweight are what discerning riders look for in a seatpost. Thats precisely why SP01 has expanded its popular carbon seatpost. With an extended range of adjustment, you can put your saddle right where you want it, so that it puts you in a position to get the most power out of every pedal stroke. Based on the design of Service Course seatposts, the SP01 has the same features as its alloy siblings, with the lightweight and stiffness advantages of carbon fiber.