This is how it looks when you take it out - its like only 13" on a car with 21" wheels...
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As you pump it up, like a lot more rubber unfolds from inside and it expands - its basically a giant cushion with a rim lol...
And finally it reaches the same tyre height exactly as the other 21" on the car...
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I don't know how they collapse it back and put it back because i drove it to Audi the next day and left it there to be fixed while i went for coffee to cope with the stress