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I was a little taken aback today when I finally got to take apart and poke around at the components of the bike I bought. I was convinced that it had a freehub and cassette, but instead it’s got a freewheel. I intend to change it from 6 to 7-speed, and had thought that would be as easy as getting a new cassette, but now I need to:

• buy a 7-speed freewheel, or
• buy a new/used wheel with a freehub and 126mm rear spacing, or
• learn to rebuild one of the wheels I have to make it work

That first option seems REALLY convenient. Is there any reason not to stick with a freewheel? I’m aware that there can be uneven wear on the axle, but is there anything beyond that?