Yesterday the chain came off my fixed gear bike twice. Once while pedaling at a very high cadence and the second time while backpedaling. The first time I would have thought that the tension was correct. The crankset isn't as concentric as it should be so there is a little slack at one point during a revolution. Otherwise it has worked fine on other rides, The second time, perhaps chain alignment/tension may not have been correct. Field repairs are not usually optimal. What should I watch for in correcting this problem?
Paul Patzkowsky Longmont, Colorado Lots of "babes" on the road yesterday