Never seen that before. Its the neatest space saving spare ever.
Now ya can limp to the tire store after driving across that job site.
and its prettier that hanging a magnet bar on the front to pick up nails.
It's the same diameter as the 19" wheel - so it won't trigger anti-skid. It is thinner so it will fit without pushing up on the floor liner (and I have the WeatherTech floor mat on top of that) .
I had to use it yesterday. One of my plugged tires was plugged a bit too close to the sidewall and started leaking air. New tire on order... spare working well in the meantime.