This Heavy Duty #35 Chain upgrade is the perfect addition to your Extreme Razor Kit that can handle the savage levels of abuse the Extreme Kit can dish out. This chain is much stronger than other offerings and requires less maintenance. The rear sprocket is constructed out of 7075 aerospace grade aluminum with maximum lightening holes to ensure the lowest possible rotating mass. Kit Includes a new #35 front sprocket that is a direct fit for your MY1020, EC4P or The "ONE" motor. With our upgraded Tensioner spring to go with the whole thing; there will be no more throwing chains!   Overall you will have much less chain wear than ever before, and MUCH less chain maintenance than other alternatives. Upgraded chains also will give your bike a new and exciting sound!  Get rid of that cheap steel sprocket and upgrade to a moto level part today! Kit Includes 1x 65T rear E&C HD #35 Ultralight sprocket 1x #35 Chain & Master link1x Front #35 Sprocket (9-11) 1x E&C Heavy Duty Tensioner Spring Compatibility THIS IS FOR RAZOR MX500, MX650, SX500 & RSF650 ONLY BE SURE TO SELECT THE CORRECT MOTOR! EC4P/MY1020 and The "ONE" are different. CHAIN BREAKER REQUIRED FOR STOCK SWING ARMS & MAY BE NEEDED IN GENERAL! GET ONE HERE   NOTE: THIS KIT HAS DIFFERENT RATIOS THAN THE STOCK OEM CHAIN. A 9T IS HIGHLY RECOMMENDED AS A HEAVIER CHAIN INDUCES MORE LOAD / HEAT.   RSF may have clearance issues using the stock chain tensioner. Removal of this tensioner may be required to run these sprockets. THIS MOSTLY AFFECTS RSF BIKES Not compatible with ETM or other bikes.