Question about chains...I ghetto rigged a fixie on an old peogeot by screwing on a 19 tooth surly cog and an bb lockring, shortening the chain and running the chain through the inside chainring. The problem is that is doesnt seem to "flow" arount the rear cog, looks like it doesn't fit or something. The info I read online abou the Surly cog was that is could handle all chains...suggestions? help?