BG413212503 Tyre pressure does go up as the rubber gets warmer. Even after 10 minutes of driving. That is the reason why you must only put in air when tyres are cold. Most people stop at a petrol station to check tyres when they are hot and end up letting out some of the air and the next morning when they are cold it looks like they are a little flat. Never check pressure when hot.

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BG543610231 all tires get to a higher pressure as you drive because it gets warmer and the air expands. this means the device is working properly.

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BG415317393 you'd better fill your tires with nitrogen (N), rhen there is less expansion so there is less variation in pression

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Scuba How can the installation take less than five minutes to fit as claimed? These sensors require the tyre to be flat and the valve replaced.... impossible in five minutes.

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mick @Scuba No. The sensor is in the cap not in the valve

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