Actually, I think that'd be a great promotional tool.

I don't think the brakes will necessarily be an issue; look at the picture of the tweel on the test Audi A4 Michelin has been using — it's using a conventional rim and only replaces the tire, leaving the existing disc brake system intact:

I know what I'd put them on. Think Michelin (or anyone making tweels) would be willing to donate a set to me for real world abuse testing? If they survive the derby world, they'll survive anything.

And that right there is the key. Now that they're actually being produced in quantity, I bet some daring go-getter will get a set to put on their passenger car, just because they look nice and weird. Sure, they won't work great, and the car will likely lose a lot of drivability, but how is that different from any…

There are always random statistics flying around about how under-inflated tires are costing Americans one gajillion (give or take) gallons of gasoline every year. It seems to me that this Tweel thing might be a pretty good idea. I'll take mine in lime green, please.

Solution?