BMX bikes usually haven't got gear hubs. Cheapest way to get one is to buy a whole wheel with the hub you want built into it already from the beginning. Of courese you can have someone replace the hub in the existing wheel, which is every biut as much work as building a new wheel from scratch. You'll also need a set of clamps and brackets for the shifter cable. You're probably restricted to an internally geared hub, as externally geared hubs pretty much require a frame that's built to take them from the beginning.
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