Amerityre Corporation announced today that production quality prototypes of its "zero pressure" (no air) space saver spare tire are being delivered to auto companies for testing and evaluation.
The polyurethane tire is manufactured directly onto the car wheel, and never needs inflating and can never go flat. The company claims an operating range of over 2,000 miles at 50 mph. The tires (tyres?) can carry loads of up to 2,000 lbs, making them suitable for SUV-class vehicles.

Technical details here.

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