- Up to 125lbs of progressive rate coil. Great for that big hit support for aggressive riders or linear linkage designs - Lightweight and high quality Japanese steel - Retains spring-rate up to 1,000,000 compressions - Longest spring life of any lightweight steel spring on the market - Available for a 50, 52.5, 55, 57.5, 60, 62.5, and 65mm stroke Jade/Jade X shocks. If you have a 50-55mm stroke shock, get the 55mm spring. If you have a 57.5-65mm shock, get the 65mm stroke spring. If your shock does not have any of the above stroke lengths, the ProRate Spring will NOT work
