Amazon.com: Bike & bicycle replacement 220mm floating rotor mountain bike & road floating alloy A7075-5. Compatible with Most 6 Bolts rotors. For OEM brakes for high braking power and quiet stops (DR-220) :
Alligator "Alien" 220mm Mountain & E-Bike Disc Brake Rotor +160 to 220 adaptor | eBay
Try an electric bike with Elevate, our removable ebike motor kit — Bimotal Inc