I don't know about dry transfers but these work a treat.
 
	Paint the tyre side wall clear gloss, apply the decal, then a coat of semi gloss clear to seal. 
 
	Tire decals 
 
	http://www.fireballmodels.info/
 
	Or you could just buy his resin tyres, paint them and lightly sand the raised letters which I have used also. 
 
	Both excellent products.