Originally Posted by
blakcloud
Most likely a freewheel and not a cassette. Search 6 speed freewheels and see what comes up. What is on there now, as in tooth count? What is the largest cog size.
Thanks for your response. The largest cog has 26 teeth. From what I understand, the derailleur is the "short" type, and the issue of a larger cog may be that it won't be able to lift the chain to a much larger cog.