Pre-Built 18 BMX rear cassette wheel from United. This is the same wheel which can be found on Uniteds 2015 18 Supreme bike. The wheel uses a 28 hole supreme sealed cassette with 14mm male axle and is laced into a wide profile single wall alloy rim. ###section### Product Specs WHEEL SIZE18" HUBSealed 9t Cassette Hub AXLE14mm Chromoly Male DRIVE SIDERight Side Drive RIMSingle Wall SPOKESStraight Gauge NIPPLESBrass WEIGHTTBC Colour: Black