My crank grinds when pedaling and makes the chain tension vary from tight to somewhat loose. What should i do?

Question by snyperxshadow: My crank grinds when pedaling and makes the chain tension vary from tight to somewhat loose. What should i do?
i tried loosing the crank and tightening it, but to no avail.
This is a mongoose bmx bike with a 1 piece crankset.

Best answer:

Answer by edward w
you should include what kind of bike you have such as the brand and where you bought it and weather it is a compact crank, triple or single piece ….what brand (if applicable) and any other pertinent info that would better help us answer your question!

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