skipping a bit
so i have a new giant ocr elite with full ultegra. when im in the middle gear and third smallest cog, the chain has a tendency to skip when im pedaling hard. this is the only instance that i can make it happen. doesnt happen during a shift or in any other gear/cog combination. the bike has less than 100 miles on it and the rear derailleur seems to line up well. it shifts fine, but i usually find myself in this gear often and its very annoying/dangerous. lbs couldnt duplicate the problem on the stand or on the street. any ideas? i dont thinks its a sticky link because wouldnt it happen in more than just this gear, right? and i feel like the chain and cog are too new to be worn down or stretched out. thanks in advance.