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Rennen Decimal BMX Chainring 4 Bolt 104 BCD standard Gear Size:36.8T Campy style (45* 45*) integrated headset designed 340221 Campy style (45* 45*) integrated headset designed for frames with integrated bearing head tubes Features: Sold in pairs CRANK REQUIREMENT: Any crank with 4 Bolt spider Rennen chainrings at J&R Bicycles are precission machined from aircraft quality 7075 T6 aluminum (83% stronger than the 6061 many brands use) Rennen chainrings are 3 16" thick and are made for the stress of the top BMX racers and conditions
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