Dial in your Rockshox coil shock with these Genuine metric coil springs. Available in different sizes and spring rates in 50lb increments from 250-650lbs. Set the correct sag and get the most out of your shocks compression and rebound settings for the perfect ride. Available in Signature Red or Black. Perfect for: Riders looking for a different spring rate on their factory Rockshox coil shock or for riders needing a spring for their aftermarket shock. Aftermarket shocks do not include a spring. Fitment: These are only compatible with Rockshox coil shocks. These springs have a 38mm internal diameter. Not suitable for Fox, Marzocchi, or Cane Creek shocks (which use 35/36mm ID).