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Generally speaking, the driver is the rear sprocket mechanism on a cassette hub (although some race cassette's have a removable cog system). To change the rear sprocket size on a one-piece driver, the whole driver must be changed. Dan's Comp offers a wide variety of sizes and materials of drivers for BMX cassette hubs from most popular brands.
BMX Race Cassette Drivers Lightweight Aluminum Cogs
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$34.99GT One Piece Driver RH (9T)