I have a 90s Univega with an aluminum main triangle with cromo seatstays, chainstays, and fork. It is currently spaced for 126mm hubs, and has a 6 speed freewheel. I would really like to update the rear hub to a freehub design.
My question is, can a frame with cromo stays attached to an aluminum main triangle be safely cold-set to the new hub width? Or will it overstress/possibly break the attachment points? Has anyone else tried this?
Also, related Q. The front chainrings are Biopace 52/42 (in really excellent condition). Will these work with modern cassettes, or will I have chainline/chainsize/etc issues?
Basically, I want to upgrade my bike from 6 speed to 8/9 speed if possible. There is the alternative of Sheldon Brown's "8 of 9 on 7" but that would require me getting a custom built wheel (or finding one with a 7 speed, 126mm freehub for less than the price of a new car).
Sorry for rambling, any help, experience, advice (like, "Don't Do It!") etc, is greatly appeciated