would it be ill advised to braze a disc tab onto a frame that has a steel rear triangle, that is bolted / bonded to an aluminium main frame?
It would be well advised to braze in a strut between seat stay and chainstay whilst you were at it if you did go that route.
@chiroshi started
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would it be ill advised to braze a disc tab onto a frame that has a steel rear triangle, that is bolted / bonded to an aluminium main frame?