The AFR shocks that come on the Epic S-works and Marathons have a tech bulletin from spec. They have a new piece that installs in the shock to prevent bottoming out in case of low pressure. I just put mine in and it takes less than 5 minutes to do. The rep said they have only had 5 bikes that have had this problem, but are shipping the bumper inserts out to update the bikes that have already been sold. May want to call your lbs to get it updated if this pertains to you. Happy riding!
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Thread: Epic AFR Shock tech update