I bought my Cross Check on July 16th and rode it about 150 miles by the time it had it's 1 month free tune up at the LBS where I bought it. So I've had it almost 2 months and it's got at least another 100-150 miles on it in the past month (250-300 total). It has a compact double chainring set up. I was in the small chain ring in the front and middle cogs in the back (maybe toward the bigger cogs a little), when I came to a stop on a 1-2% slow, short hill. I took off from my start, was under slight load when I shifted from small to large chainring and the chain shot past the large chainring and got caught between the chainring and my lovely chainring guard. I could not pedal, so coasted to the side of the road (I had taken the lane and there was a car behind me, but we were going slowly). I moved my bike onto the sidewalk where I could not pull the chain out, so I flipped my bike upside down on the lawn, pulled out the part of the chain that was stuck, pedaled and voila - chain and chain rings were playing nicely. Took all of about 30 seconds. On the way home I did some shifting in the front while on the flats with no problems whatsoever.
I think this was most likely due to cable stretch as the bike is still "new". Wondering what you think? I realize you shouldn't shift under load, but it's not like I was grinding up some epic hill. I probably should have shifted in the rear cogs if I had to shift at that moment since the distances aren't so significant and the chain is going "downhill" so to speak.
Anyway I'm having fenders mounted tomorrow and will have my LBS (not the one I bought it at) check/adjust the derailleurs, etc.
I appreciate any insight. Please....educate me...I'm a sponge just slurping up all the juicy knowledge here.