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Tree Bicycle Co. reintroduced the Original Bolt Drive Sprocket after lots of demand from the BMX public. The Original Bolt Drive Sprocket changed the BMX market and now it’s back in a big way. For starters, the Tree Original Bolt Sprocket Drive is constructed from ¼” thick 7075 T6 aluminum that has been shaped and sculpted to lose weight where it could without compromising strength. Tree allows the sprocket to have 5 different crank arm bolt positions in order to help extend the life of the sprocket.