I'm talking to the owner of an LBS about doing a partial rebuild on my Nishiki 10 speed. First I want to start with a good wheelset. He recommends a change to a 7 speed cassette vs. a freewheel.
Can someone explain the difference between a freewheel and a cassette? I know what a cassette is but I guess I don't know what a freewheel is. And why go to 7 speed vs. 8 or 9 speed?