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Learn moreHey, I noticed that for my tires. The valve stems where you stick the nozzle in to put more air in....it is wrinkly or crackly....if I try ibending it left or right, it will hiss out air...but leaving it alone won't let air out....I think it'll get worse over time...I noticed my rear tire was at 21psi most likely the tire i curb rashed a while back...i'm gonna fill it up...but anyways, if everything is fine should i leave it the way it is and just periodicly check on it over time....or should i get it fixed....how much does it cost to fix this problem with the valve stems?