New answers tagged wheelset
As already stated by @Batman, the wheel of a Walmart bike won't be worth the effort. Do you have a local bike co-op, or a recycle center - you can probably scavenge a wheel of an old bike? Try to get in touch with a local cycle club or local cycle group - most cyclists I know have a selection of spares they would be more than happy to 'rehome' ...
First, note that if you're using indexed shifters that you need to match the number of cogs on the cassette to the shifters. Cheap wheels are normally not worth the money -- you'll have trouble keeping them true or from failing, especially in a difficult situation like mountain biking. On freewheels and cassette installation, I'd suggest reading this link ...
The wheel by itself will likely be of much better quality, as one of the main places costs are cut when building BSOs (bike-shaped objects) is in the wheels... so you will either have a few okay bike parts and some okay tools you can re-use or a lot of worthless bike parts. Your choice.
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