HOT ROD SED SHOP INC DUAL RATE FRONT SPRING KIT for Ski-doo 2004-2007 REV CHASSIS 600 & 800 Adrenaline, Renegade, and "X" model 2 stroke sleds with 2" diameter front shocks and 42" ski stance. NEW FOR 2021! -This is a more aggressive, stiffer than stock, front dual rate spring kit that works really well with stock shock valving and is a quick install. One of our goals was for the consumer to just install these on stock shocks without the big cost of revalving and get a much better handling sled. Most of your stock MXZ springs are somewhere in the 100-105 lb. rate (when new) which is mushy, too soft, and causes body roll in turns. Stop the body roll and mushy, soft, and quick bottoming front end on your sled with these top quality dual rate spring kits. Our front suspension spring kits are dual rate and have a stiffer initial rate for better cornering while offering a firmer more planted feel in the stutters as well as jamming over the big g-outs and moguls. The dual rate of our springs controls the really big hits with less bottoming and better control of front end compression. This kit still offers a smooth plush ride but has a stiffer rate as they are compressed more keeping the body roll and bottoming at a minimum while offering a smooth ride. These are the answer to the TUG HILL & MICHIGAN U.P. Saturday afternoon bumps that are world famous! These are top quality USA made kits powder coated black and have billet aluminum spring adapters and delrin separator.