Originally Posted by
mtnbud
I picked up a vintage Specialized Epic road bike .......
I was considering putting a 11 to 28 cassette on the bike and changing the 42 tooth front sprocket to a 39. The rear derailleur is a short change Shimano 600. The front derailleur is Shimano 600 also.
I'm not sure the derailleur would handle the gear inches and if the changes would be worth the cost. It shifts flawlessly right now. I'd hate to mess up a good thing.
What do you guys think?
Your vintage crank probably does not accept a 39 tooth chainring. You could probably find a cheap replacement crankset, new or used, that would work with your current bottom bracket.