Quote Originally Posted by ouvreur View Post
Or he's driving the same, but the rubber part between the wheel rim and the road is weaker?
Could be. But still, even ordinary road tyres don't inflate without hitting something. So it's still because he hits things with them faster than they are designed to withstand.

If the tyres are weaker, you must adjust you driving accordingly. it seems he has not adjusted his driving to make them last.