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Is my back deraileur misaligned? The 2 largest cogs cause the chain to "float" and not stay. Sucks, because I need those gears a lot on uphills. I tried adjusting the L-limit screw and it doesn't help. It still just floats between the cogs and doesn't stay on the last 2 well at all. I tried cleaning and all that but no avail. Not sure why this started to happen. I did fall on it once and another time I was doing something and forgot to put the leg down and the bike fell. So I'm guessing it's slightly misaligned now but I don't want to bend this and break it further.