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A GuestReplaced the SL-TX50-7R shifter on my son's bike. Nearly new, never dumped, an internal plastic part broke and the up shift button no longer worked. I bought this because it was the cheapest 7 sp MTB lever shifter, and I definitely didn't want another TX50. This thing is not going to break. A simple lever with big clicky detents, it has practically no mechanism to jam. No finicky pawls and releases. And it's light. If I was on a trek across Mongolia and I just wanted something that would not break I would use one of these. Best price and fast shipping from tree fort.