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The wheels are aluminium, not steel. The green valve stem covers are more functional then the nitrogen in the tires unless you plan on keeping the same tires on for the life of the vehicle. Normal air is cheap and easy enough(free). There is a dealership here that sold nitrogen filled tires for $300. They said she got "special" wheels. LOL Theres a sucker born every minute I guess.
I can see the use in race applications, but for every day cars, not really any point.
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