Coating the insides with dish soap helps them hold air. I haven't had mine drop any air pressure with this trick but I haven't left them on my car for longer than 6 hours though. I also take most of the air out of them when I'm done at the track as well(that way I can fit at least one of them in my hatch with the battery box).
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393W: AFR 205's, hydraulic roller, TKO600.
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