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ok guys here to pick your brains. When i start accellerating i hear and feel a klunk that feels like it is coming from below me, can't tell if it is front, rear or directly below, it almost seems to move. I just had both tires changed, tightened the chain then had to tighten it again after 3 days, seems to be holding tight for now. seems louder if i am starting and accellerating around a corner. Sprockets look mint even though they have 18k miles on them and the chain looks alright but might it not be? the front sprocket actually look sbrand new, shiny and everything and all teeth are perfectly shaped and all there, rear is dirty (chain wax for 18k miles) but shape and none missing. I am out of ideas, what should i check next?