Seal bmx rear wheelthe seal bmx 9t cassette wheel offers a great value upgrade or replacement option for the first time or novice rider they feature a 9 tooth cassette hub with 14mm axle that runs on 5 fully sealed japanese bearings for fast and drag free performance this sealed hub is laced onto a single wall oem quality rim with a pinned joint with plain gauge steel spokes these complete wheels offer great quick and easy upgrade or repair to any 20 wheeled bmx bike the 9 tooth driver is