Replace hub from old cassette to new fixed I have an old mavic race rear wheel where the hub is rusted, but the spokes and rim is in prime condition. Thinking about changing just the hub (reusing spokes) to a fixed flip-flop to use the wheel on a project bike. Doesn't have to be perfect.

My hunt for the correct rear hub for the operation, has led me to a couple of questions and a checklist:


Mounting width is easy (normally 120mm or 135mm).
Axle width affects the chainline.
Number of spokes.
Flange diameter affects the spoke length (+ stiffness of wheel).


The point I'm most concerned about is the flange diameter. The old hub has a pretty low flange and all fixed hubs has high flange. Also drive-side of the old hub looks like it uses shorter spokes then the left side. Is this conversion event doable?
I've seen this done and mostly work out ok, but I still wouldn't recommend it for the commented reasons.  If do want to attempt to reuse the spokes, you'll need to buy a hub with as close to the same flange size as possible.  If you go with a wider flange, you'll end up with spokes poking through your rim that you'll need to cut and possibly rethread.  If you go with a smaller flanged hub, the spokes may not be long enough.

Spokes are the answer to a question involving the effective rim diameter, flange width, pattern and a few other variables.  If you change any of those variables, the answer will be different and you'll need different spokes.