Take the 2-minute tour ×  I bought a basic wheel set for a hack
bike project. The rear wheel has a single speed cog, and a
dangly adjuster thingy - maybe 2 inches long. What is that for?
share|improve this question Could you perhaps include a picture
or a link to something similar? –  jilles de wit Dec 3 '12 at
10:58 This really needs a picture or a more detailed
description. There are several things that could conceivably be
dangling back there... –  freiheit Dec 3 '12 at 17:57 Hi Guys,
ill add a photo tonight when i get home from work. Thanks for
pitching in. It is definitely not a internal hub or coaster
brake. –  Will Dec 3 '12 at 22:02 Given that it is a single
speed, it could be a chain tensioner. But as the other
commenters have said, a picture would help. –  deemar Dec 6 '12
at 11:03  2 Answers 2  The dangly adjuster thing is most likely
the toggle chain for an internally geared hub!  3 speed hub  The
tension on that chain shifts the hub internally (rather than
through a derailleur and cogset). Bike