Quote Originally Posted by wildeny View Post
Short question: how much is the installation charge of a groupset in a LBS in US? (as compared with the price in a online store)

Is LBS willing to install a groupset for you, at some fee of course, even though you bought the groupset elsewhere?
IME, yes, most are. The going rate for labor around here is $60/hour, so I would expect to pay about $100-$120 to build a bare frame up. If they have to strip the old stuff off, you might pay a little more for their time to do so.

Good luck on your brevet!