First Timer 80s Raleigh Conversion

Hey dude, I really don't want to rain on your parade, and it's great to see someone building up a bike for thmselves, but you're going to have some issues with that Biopace chainring. First off, it's not round, but more of an oval shape, and so you'll never find equal chain tension, which is fairly important especially if you're riding fixed. Also, the design itself was slated after being released as the apex of the oval isn't in the 'dead zone' of the crank rotation, so it ended up being tougher on your knees and no more efficient than a normal ring. Sorry to be the bearer of bad news, but it really isn't useable without a variable tensioner/derailleur.

It seems the cycling God that is Sheldon Brown actually rode fixed on a Biopace chainring with no sufficient troubles...

http://sheldonbrown.com/biopace.html

@Pauly1978: Based on the above link I'd utilise the setup you already have when fully built just to test and to see if it actually does work for you. Could save you a couple of £ if it works rather than dismissing the Biopace and buying a different chain ring without trying it out. Great thread/build.