Aftermarket spring kit for NCX Seat Post

Soft Blue spring is rated for 140lbs- or less

Hard Red spring is rated for 180lbs+ or more

Quick and simple installation 

Compatible with all sizes of SR Suntour seat post

https://www.youtube.com/watch?v=yRmQYUmnusg&feature=emb_logo 

*medium springs are factory installed on all post sold by SR Suntour North America