It is pretty straight,i do not know too much about bikes ESP. fixed so im assuming the guy at my LBS did it correctly,like i said,its ONLY when i slow down from pedaling quickly or i pedal too quickly and its not during the whole chain revolution,maybe once or a twice a revolution,I checked all the previous posts about this and it was not happening 2 hours ago before i got the new chain so it must be something to do with that,if i move the rear wheel forward a tad it seems to slip off when i accelerate as well so id rather deal with the clicking than that but id like to quell both... ha