My bike...ok i have a single speed bike but the tire keeps moving to the left..no matter how tight i put the..

no matter how tight i put the bolts. i dont know why its doing this..can someone help me..like when i straighten it up and i ride it moves to the left and rubes againsts the bar.

Are you using washers between the frame and the axel nuts? You should.

Sounds like you have a bent axel. get a new one they run about 10 so not too bad.
Take it in to your local bike shop and pay like 20 bucks tops for them to true your wheel and ask them what else could cause it.
Hub bearings might be out of adjustment, and you probably are missing a spacer or two on the axle.
same thing was happening to me, it goes that way because of the pulling power from the chain. if there are washers between your bolts and the frame take them out. thats what i did and i hit jumps and everything and is hasnt moved since.

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