Heavy Hitter 520 Primary Drive Conversion OEM/EBMX Ultra Motors MFPN=ST21-MQ579110-BK Weather sealing was a main

Weather sealing was a main focus with o-ring seals on the spindle and inner shell

Designed with ergonomic flare that adds approximately 20mm of total width at ends of drops

}microSHIFT M21 Rear Derailleur - 67 Speed Short Cage Black

}Wheels Manufacturing Derailleur Hanger 360

Heavy Hitter 520 Primary Drive Conversion OEM/EBMX Ultra Motors MFPN=ST21-MQ579110-BK Weather sealing was a mainThis kit was designed for riders who want to maximize their bike's performance. As seen on EBMX FIM E Xplorer race team bikes ridden by Jack Field & Jess Gardiner. This is the lightest kit on the market, which means less rotational mass, and resistance. This kit consists of a hybrid sprocket setup, with the rear sprocket being a 7075 T6 Billet with anodized hard coating, and the front sprocket being a machined steel sprocket, heat treated, and counter