Hope the group can help. Looking to upgrade 1990 era Specialized Allez Epic carbon lugged frame. Shimano 105 components with downtube shifters, 7 cog rear cassette, double in front. Questions are:
If I upgrade wheels, can I go to 8 cogs without upgrading derailleur(s)? Can I get a spacer to adapt the 7 cassette to a 8-9-10 compatible rear hub? If I can't adapt and need to upgrade shifters & dérailleur, will I need to cruise EBay to find components that will fit, or can more current / modern Shimano gear work.
I apologize for all the questions, but this is my first effort at such an extensive retro- fit / upgrade. I love this frame, have put many miles on it, and want to breath some new life into it. Thanks in advance!!!