Special notes about the Install: The Intense 6.6 SS is a top swing Dualrailleur Guide with a special relief cut to clear the chain stay. You must also add a relief to the ISCG standard Roller plate. These are modification that can be made by a professional mechanic, if you haven’t received the proper Dualrailleur Guide System. Please contact Wicked Racin, if you have any question before modifying the stock Dualrailleur Guide System. Please contact Wicked Racin before any modification are made for it may void the warranty