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O, you don't remove it, you can actually adjust the that so that it doesn't rub. There are two tiny screw somewhere on there that stick out a bit. You turn those one way or another to make the front and back of that thing move in and out a bit for small adjustments, it probably just needs to be adjusted. But it's not a guard, that's the actual derailer, without that you can't shift...
It could also be that you're in the wrong gear ratio for that gear. I can't remember what it usually is. But there are certain rear gears for certain front gears and if you put it in the biggest front gear and in the wrong combination of the two it will make the chain angle funny so it rubs a lot.
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