Definition of "tensioner" []

• Any device that maintains or applies tension (noun)

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• "Rear suspension + no chain tensioner = very very very bad idea."
• "The nose of the saddle has ripped off the steel tensioning piece at the rivets one still in the leather, another still visible in the tensioner, hence the hammocky shape to the back of the saddle."
• "I think the best chain tensioner for the Empire State Courier is the Fuck Nut Hugger, which is probably on sale at Nashbar."