What does this button do

Rory Williams said:

While Stripping the paint of a frame I am building up for my daughter
yesterday I pondered the existence of a small button or peg low down on
the cluster side of the seat stay. I've seen them before, my bike has
one, I have always presumed it is there to hook the chain on somehow,
but I don't know how or why.

Anyone shed some light on this one?

Thanks

RoryW

Rory,

Yes, we've had this discussion before. It IS a hook for the chain for
when you remove the rear wheel. Some frames have a small hole in this
location where you can, presumably, place a pin or somesuch in order to
hook the chain on. A very handy device I must say.

--
Bean

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