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i was wondering what the bolt on my rear rim is, directly across from the air screw, it is leaking air and i have a flat tires now

Its the rim lock. It keeps the tire from spinning on the rim. It most likely had nothing to do with your flat unless someone installed it incorrectly pinching the tube.
O.D.

yea i took off the tire and there was a tiny hole in the tube, so i got a new one thx