I have an 80's Trek road bike. I was trying for a second set of wheels and bought a nice set of mavics that come with no cassette. My old wheels are pre cassette and being cheap I bought a mountain bike cassette which fit nicely. I used these wheels for the first time this weekend and whenever I put any pressure on the cranks I had chain skipping issues. I am thinking I need a new chain since it is probably very old and the cassette is pretty new. Am I correct?? Just riding around the neighborhood I have no issues.