I considered a similar product as I found it very difficult to check the tire pressure on both the inside and outside tires - mostly due to he wheel simulator. Many people report good results but many do not. Instead I purchased longer, rigid metal valve stems. Cost $110 for the set of four (Online from Your Tire Shop in CA) and an additional $100 to have a local tire shop install them. Expensive, but so far they are working great. Good luck!
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