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When buying a new BMX Bottom Bracket just make sure you select the correct size based off your cranks. So if you have a 19mm Spindal in your cranks then you need a 19mm BB, so if you have 22mm spindal then you would select the 22mm BB option.  If you're not sure which one suits your cranks feel free to ask us and we'll give you the best options for your bike.