This is just the chainring not include bolts, it is for BCD104mm,single speed, suit for 9,10,11 speed. Narrow Wide Single Chainrings for 9-11 speed drivetrains. Compatible with 9, 10 and 11 speed Narrow Wide tooth profiling ensures ultimate chain retention Stiff 4mm plate thickness and I-beam construction transfer loads without flexing weight:34T(51g) measurement of teeth: "+"teeth--3.8mm; "-"teeth--2mm
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