![]() ![]() Metal caps use a rubber washer or o-ring to seal the valve completely. Valve caps are knurled to make it easier to tighten or loosen them, while some metal caps feature hex head designs. The plastic dome caps are fine for normal driving and autocrossing, however they should be replaced with metal valve caps to withstand the high temperatures experienced during racetrack driving. Three types of valve caps are available: plastic dome, metal dome or a metal "screwdriver" design used to tighten and loosen valve cores. And while using valve caps will make it take longer to check tire pressures in the pits at a racetrack, the consequence of having a tire lose pressure is much worse. In case anything disrupts the valve core's seal, the valve cap provides a backup seal that prevents air from escaping. "High-speed pressure loss and core contamination are several of the reasons why valve caps should always be used. Here is some other information I ran across while researching this: Without a cap in place or if the seal in the cap is bad you will experience low tire pressure at the end of the ride. ![]() It seems that at high speeds, don't know the exact speed as it wasn't listed, centrifugal force can cause the center of the stem to compress and release air. One cause of loss of air while riding could be the valve stem cap, that is a cap without a seal. I remember reading a thread where the poster was complaining about losing tire pressure while riding but the tire had no visible or detectable defect, now I can't find that thread to present a possible solution so I'll post what I found and maybe it will help someone else.
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