The MCS Hot Stick seat post extender is perfect for those post race cool down sessions, cruising around the track or when in the pits. It's also great for taller riders who might need a little bit of extra leg room. A seat post extender allows you to raise your existing seat and seat post combo without having to buy a taller post and continually swap it back and forth when needed. Available in 22.2mm and 27.2mm sizes. The 27.2mm includes mounting holes for water bottle holder. Requires an additional seat post clamp for use (1" for 22.2mm or 1-1/4" for 27.2mm).