I just purchased a 2006 Specialized Sirrus Sport and have noticed taht during cold weather the chain feels like it is popping in and out of gear, almost like a ghost shifting but also feels like the chain is slipping. I have sent the bike back to the place I have purchased it and they replaced the chain with a SRAM complete with a quick link and dumonde tech lube. They also adjusted the derailer and small adjustments to the derailure cables. The problem has all but gone away during riding even during uphill torquing, until the temp drops below 20ºF and I start to experience the popping again. Also, when I stop pedaling I can hear the chain "ding" the frame. I do understand that metal does contract in cold temps but this shouldn't cause these kind of problems. Would this be considered apart of the breakin process and disregard taking the bike back in to have adjustments? Any ideas? The last thing I want to do is continue taking the bike in for this problem and become one of those annoying, problem child customers.