Vortex HFRS Hyper Fast 520 Conversion Chain and Sprocket Kit CK6341. Use RV3 or SV3 Vortex chains. HFRA "HYPER FAST" 520 KIT.Conventional Street kit with hard-coat aluminum rear sprocket. Gearing one down in front, two up in rear. HFRS "HYPER FAST" 520 KIT. Conventional Street kit with laser cut steel rear sprocket. Stock gearing with laser cut steel rear sprocket. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle & Scooter Parts & Accessories\Transmission & Drivetrain\Final & Primary Drive Parts & Kits\Final Drive Kits". The seller is "atvunlimited" and is located in this country: US. This item can be shipped worldwide.