Building a touring bike - road and mountain rear derailleurs
I'm building a touring bike around an 88 miyata 615 and am almost done collecting my parts. I have an Ultegra 6500 rear derailleur and a cassette to match it in my parts bin I could use but the cog limit on that is 27t. Is it worth getting a new rd that accepts larger cassettes even with my 48-38-28 crank?