Kind Shock 30.9 mm Dropper Bicycle Seatposts
About Kind Shock - Kind Shock is an industry leader in suspension and dropper seat posts.
The seatpost diameter must match to the seat tube diamater of your frame. If replacing a seatpost, you can usually find this measurement etched near the bottom of your current post.
Dropper posts have the ability to change heights. This has become a choice for mountain bike riders that prefer multiple riding positions.