The service course 350mm seatpost from zipp has been improved resulting in a post thats lightweight strong and affordable with a precise fit it has also been improved for easier tool access to the downward facing bolt for easy set up a better fit means better performance an out of position saddle means you waste energy in every pedal stroke the secure low profile clamp allows the saddle to slide farther back along the rails and with 0 mm and 20 mm setback options its possible for near