Low car diet
Join Date: Aug 2007
Location: Corvallis, OR, USA
Bikes: 2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
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OP: When you say, "every now and then if I'm in the 50t and I've used the trim click and then later try to shift into the 36t, the brifter will stick. I have to hit it once (nothing will happen)", do you at least hear or feel a click from that first tap? If you do, then I don't think it's a mechanical problem, just doing what it's supposed to do. If it is really doing nothing at all, then, yeah, clean it out.
You might be able to adjust the FD so that you can't even use the half shift in the large ring by tightening the High limit screw. However, if this prevents up-shifting altogether and/or causes chain rub in the highest gear, then it won't work.