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I MX ride and had my rear shock revalved twice but it was still bottoming out on hard landings. I thought I'd have to look at the spring rates. I wanted a Zero Preload Setup so after much research I tried a slightly stiffer progressive rate main spring from KTM dirt bikes(2003 KTM 250SX) and it works like a champ. There is very little preload but great progressive suspension action...really! Check out factory connections website for different rates. The stock main spring is a straight rate at about 6.6kg/mm. The PDS-7 off of the KTM shock is progressive from 7.5kg/mm to 9.5kg/mm. This allows less preload and greater use of the tender spring along with a higher bottoming resistance...plus these springs are a dime a dozen as alot of guys change them out. Try it, you'll like it!
 

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Thanks for the info. I also bottom out a lot on hard landings but I didn't want to increase the preload because then it's to stiff over small stuff. Did it change your ride height any?
 
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