Freewheel & derailleur compatibility question
Need some help on this. Currently have a bike that is equipped with Campag 980 with a 52-42 crank and 13-24 freewheel. I wanted to get a slightly lower gear and I was looking at installing a 13-28 freewheel and going to 7 speed. The mechanic at my LBS said it should be able to handle a 28 tooth max. Also I've been made a sweet deal on NOS Suntour Sprint 9000 derailleurs and shifters. Would either of the rear mechs be ok with the 28 tooth on the rear? I would imagine I just have to stay off the large ring in front when on the larger two cogs in back.