Bolt on BMX racing hubs designed for brakeless/rim brake front and 6 bolt disc rearHigh quality 6061-T6 alloy shells with bolted hollow axlesRear hub features a 16T x 3/32 machined alloy cog and 6 pawl asynchronus 2.4° engagementHigh quality sealed bearings protect from dust and contaminantsBMX1s Cass w16t36HB/O-BOLT M10x1AlyBlk6B110UPC/EAN/GTIN: 888571123096