Upgrade Vintage Road Bike with New Drivetrain?
Took my '80s-era Trek 420 out for a couple 20-mile rides already this spring and the stock drivetrain feels...tired, I guess is the best way too put it. Like the bike otherwise, bought it used cheap in fall of 2019 and gave it a bit of a refurbishment, have put a thousand or so miles on it since. Probably always rode this way, just becoming more apparent the more I get into road biking. Anyway, are there decent budget drivetrain kits out there that would be worth upgrading with? Or does it make more sense to piecemeal something together? Or is it not worth the money to upgrade a mid-low range 35-year old bike?
Thanks for the input.