I have a 1990 Giant Allegre with a Suntour GPX groupo... the bike and it's components are in nice shape, but the frame is just too massive (60 cm! I need a 56cm). I am considering swapping out the frame/fork/headset/stem for this generic performance bike aluminum frame, which appears to be compatible with downtube shifters. Based on the information I found in this old Suntour GPX information sheet, it appears as if the bottom bracket sizes will be compatible. I'd buy a fork and headset with the frame, too, so I wouldn't have to worry about head tube compatibility. Is there anything else I should look out for when doing a frame swap like this? Might hub spacing be an issue?
I'm a newbie, so I wouldn't be surprised if I'm totally overlooking something critical here. But I've always operated under the belief that you never learn anything until you try it yourself, and I'd like to get more into the mechanics of maintaining bicycles as a hobby. Thanks for any input, advice, or guidance you can give me! If it'd help to have a picture of the Giant, I can certainly upload one.