Burgtec 104mm BCD Thick Thin Chainring

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104mm BCD Thick Thin Chainring the perfect partner for Shimano cranks. Designed to work with clutch derailleurs to keep your chain from dropping off even on the roughest of trails. Made from aerospace grade aluminium. Note: Bolt holes on 30T are threaded, 8mm x 0.75mm x 8mm Long chainring bolts are required. 12 Speed Hyper Glide Chain Compatible Using on a E-Bike?, please look at the steel E-Bike Chainrings Show more