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Do you see the black chain at the top? When I push down the pedal, the chain goes down and touches the black long metal bar(I don't know what you call it). I tried simply changing the gears higher and lower to see if it fixes the problem but it does not(I use this method because in the past I had this problem a few times and one person simply change the gears and cycle and it fixed the chain problem.
Where in the picture is the problem?