Madison revell frame

[spiderman2]

Does anyone know what this part is for on frame?

 

[midlife]

Hanging the chain on when changing the wheel

 

[spiderman2]

Hanging the chain on when changing the wheel

Thanks,hadn’t thought of that .

 

[Paulus]

That was short and sweet.
A lot of frams have them, many don't.

 

[spiderman2]

think it an early 1980s frame.not seen it before on any bike ive had over many years