REAR HUB   The KLS ACTIVE CASSETTE rear hub is designed for 7-speed bicycles with a cassette hub, with V-brakes, and with a standard quick release.   DETAILS 7-speed V-Brake 32 holes Ball bearing Hole distance 45/45mm Axle 9x135mm Made of aluminum alloy   VARIANTS Color: Black, Silver   ACCESSORIES Axle with quick release 9x135mm (included in the package)   COMPATIBILITY 7-speed bikes with cassette hub, with V-brakes, with by mounting in the fork using a standard quick release 9x135mm, hub hole spacing 45/45mm