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I converted a Schwinn '10-speed' bicycle to a Singlespeed.
My rear wheel came with a Hyperglide Cassette Hub. This hub uses cogs that have inner teeth that mesh with grooves on the hub. A locknut keeps the cogs from sliding off sideways. I removed the cogs, slid a tubing spacer ring onto the hub followed by one cog and then another ring and finally the nut. Singlespeed!
(More Singlespeed construction details are available all over the web.)
I liked it!
Just ride and forget all that gear shifting stuff.
I then thought I might want to try a fixie.
I needed a hub that was without a freewheel.
I didn't want to spend any money on a new wheel with a track (fixed) hub.
I didn't want to buy a new fixed hub and lace it onto my wheel.
I decided to hack my existing freewheel.
I fixed it!



whilst being able to rearrange and customise the gears on a cassette is a skill worth learning and one I'm sure most people are not aware is possible. I'm surprised to learn wheels with a built in free wheel are still made. l stand to be corrected but most rear wheels have a standard thread onto which you screw either a freewheel hub and cassette of your choice, or a single fixed gear. a readily available and standard sized spinner tool is all that is needed to remove either and change it over. there are exceptions such as hub gear boxes which only have a single sprocket and built-in freewheel anyway.
OK. Well yes, the freewheel is in the hub, not the wheel. You can screw on a freewheel that has a single cog, like on a bmx, and now you have a singlespeed (the chainline between the chainwheel and cog will be way off). Or you can screw a single cog onto the wheel threads, even with a second nut, and it will unscrew and fall off the first time you put back pressure on the pedals, and you will not have a fixie. To make a fixed gear setup, one needs to lace the wheel to a (track) hub which has no freewheeling ratchet mechanism and has opposing lockring threads, or buy a wheel that has a fixed (track) hub that has opposing lockring threads laced onto it, or 'fix' your existing freewheeling hub as per my video.

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