I asked a similar question in the C/V forum, but now I have more specific technical questions and would appreciate any advice.
I have a steel frame (Peugeot/Reynolds 708) that I got second hand. I have been riding it through the summer and really like the frame, but not so much the components. Firstly, I would like to get rid of the wheels, as the stock Mavic MA40 seem to flex a bit too much on the climbs. I was looking at Fulcrum 5.
As I was thinking on whether the Fulcrums are compatible with the older Shimano 600 cassette and other components, I realized that I could as well swap the cassette. I currently have the traditional 52/42 chainring with a 9-sp cassette and struggle a bit on steeper climbs. So I am considering getting a new cassette. I noticed that there is a Ultegra 9-speed 12-27 available. Does anyone know, whether it would work OK with the Shimano 600 derailleur? It seems quite a range. Would it still shift nicely? My technical knowledge in these things is very limited, especially when it comes to older road bike components. Any advice is welcome!