Join Date: Nov 2007
Location: Toronto, ON
Bikes: 2008 IRO Angus, 2008 Jamis Exile 29er
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If this is an accurate picture of your bike
You might run into a few issues.
The rear wheel needs to be replace, or at least the rear hub if you're prepared to have the rear rim re-built.
First, the dropouts
are vertical, which would limit you to a magic gear
setup, or a chain tensioner, such as the Surly Singleator
which would be suitable for single-speed applications only. Again, it is ABSOLUTELY NOT SUITABLE FOR FIXED GEAR APPLICATIONS.
Another, albeit expensive, option is an eccentric hub
which would allow you to adjust the chain tension on a bike with vertical dropouts.
For the cranks/chainring, you probably won't need to do much more than remove unwanted chainrings and use spacers to adjust the chainline. You could even leave them all on if you really want to, it's just rather unsightly.