I dont think you will easily be able to find a buyer for that domain even at reg. price unless you build a site up and get some traffic to it.
FourTyres isn't really unique, it's more of like a random numbered keyword. Unless their is some sort of trend for "four tyres" apart from the fact their is four tyres on a car, you'd probably get like $30 for it. I'd higher it to about $80 since its .com, no numbers and no dashes. That's my opinion, can flunctuate though.