funny thing when u pick up an old 10speed
tires are often the least of your issues
bikes often are listed as rtr
but havent been overhauled in many years (if ever)
my experience has been a great one since i have enjoyed all the bike mechanics i have learned
but it requires time, educating yourself, patience and tooling up
you can get lucky with an old bike and not have it act up for awhile but eventually it does and if you're not willing to learn the skills to maintain then get your wallet out at the LBS and be prepared to spend more than the bike is usually worth