TOM rear wheel Rear wheel with Zac 2000 rim and Shimano Nexus 8 hub for coaster brake or disc brake. General specifications: Type of bicycle: city bike, electric bike Inch size: 28 inch ETRTO size: 622 Position: rear Brake system: coaster brake, disc brake Rim specifications: Type: Ryde Zac 2000 Rim color: black Rim flange color: silver Material: aluminum Outer width: 24.6 mm Inner width: 19 mm Height: 21.5 mm Valve hole: 6.5 mm Hub specifications: Color: silver Material: steel Type of bicycle: city bike / electric bike Number of gears: 8V Brake system: coaster brake (brake hub), disc brake (for SM-RTC60) Axle length: 187 mm Installation width: 135 mm Flange distance: 58.3 mm Flange width: 3.2 mm Type: SG-C6001-8CD Spoke specifications: Number: 36 Material: Stainless steel