I tried to ask this before, but I don't think the question came out clearly. I have an early 80's Austro Daimler Olympian. It has the standard front derailleur from Huret, and a Suntour GT rear. The wheels are shot, pitted bearings, bad rims, etc. so I am planning on replacing them with new wheels. I tried out the 8-speed rear from my son's Sora equipped bike. Width-wise it fit fine, no spacing or anything else needed.
My question: I could not get the current derailleur to shift across all 8 cogs. It only went across the middle six. Can I adjust this out? What parts do I need to get this working? Will I need a new derailleur? Will an 8 speed chain work with the original front chain rings? Recommendations?
I am flirting with the idea of slowly building this up to an STI setup. Budget-wise that will be a slow process. Skills-wise, I am probably my own worst enemy, but I'm willing to try.