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Dan's Comp BMX Sprockets Dan's Comp has you covered with a huge selection of aftermarket BMX sprockets and chainrings. Sprockets, often called chainwheels, are typically used for freestyle applications and come in a wide variety of styles to best fit your needs. Chainrings are used for racing applications and bolt to a spider gear for quick and easy gear ratio changes. We also offer a selection of sprocket accessories including chainring bolts and sprocket guards.