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Wolf Tooth - How to measure Bolt Circle Diameter (BCD) – Wolf Tooth Components
Amazon.com : FIFTY-FIFTY Round Oval 104BCD Chainring, 30T 32T 34T 36T Narrow Wide Mountain Bike Chainring, Single Chainring for 9/10/11-Speed with 4 Alloy Chainring Bolts for MTB (30T, Oval Black) : Sports
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