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I had to look this up to figure out what in the world. They're BMX bike grips. Now why they're on a pizza I have no idea. Extra fiber?

LOL this is probably one of those ads that only makes sense to people involved in the sport - like how skateboarding ads are a little weird or gross.
*creaks open memory vault* Wait, weren't mushrooms a sort of bicycle tire?
I'm not sure now. There were banana seats and I was fairly sure mushroom tires were the type we now call 'balloon tires,' puffier than slender 10 speed bike tires and similar to the ones now on beach cruiser bikes. But likelier is that I've conflated mushroom patch for punctures with the whole concept or tire.