The 'narrow-wide' chainring is a drive gear for a bicycle that features an alternating tooth profile. This is to say, one tooth is wide, and the next is narrow just like a bicycle chain. Today we'll watch slow motion footage demonstrating why these gears are so effective at keeping your chain on.

Eric @BCpov mentioned on our Substack how Ghel patented a very similar gear back in 1978 for heavy machinery. That patent has since expired, and is owned by Manitou. https://patents.google.com/patent/US4...

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