i keep reading and hearing how "whisper quiet" everyones fixed bikes are. is there something wrong with mine? i am running a 42 zen messenger ring with a kmc 410 1/8th chain to a 16 tooth dura-ace 1/8th cog. it feels super smooth, and it all looks pretty darn straight - just not that quiet. sounds like my 20" bmx bike. lots of chain spinning noise.