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let me rephrase what the previous user said. i ride bmx and i know almost eveything about bikes. your chain gets loose because your frame dropouts are striped. when you pedal the strip is going towards the frame so your chain gets loose. the only best idea is to get washer, bring to bike shop to resurface it flat and recreate the integrated chain tensioner, or go on to buy some chain tensioners that work really well.

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14y ago
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Q: When I tighten the chain on my BMX by pushing the wheels back as far as they will go and do the nuts up relly tight after i pedal it goes loose again. Any Help?
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