The steel wheel with those compomotives is a waste of time. It's a Denovo. They were a runflat wheel and tyre combo developed by Dunlop for the 1275GT like he says in the advert but being 310mm instead of 13" Dunlop were the only ones who ever made tyres for them and they don't any more. He's on dodgy ground saying it's a 13 because if someone fits a 13" tyre to it although it might hold air it'll be lethal at anything over walking pace.
Iain