I just test drove a Giant TCR Avdvanced Pro 1 2018. Love the ride, but while the chain is on the the large front chain ring, I experienced chain rub on the front derailleur for the 3 lowest (largest) cassette gears. I went to engage the trim to relieve the chain rub, but there was little if any trim affect. I asked the bike mechanic to adjust, and he tried but then said "that is just the way it is".

I **know crossing chaining is not ideal** for long periods, but every other bike I have ridden allows you to simply engage the trim to eliminate chain rub.

Thoughts? Anyone experience this on their TCR? Or is it time to find a new mechanic?