just found a screw 1 inch from the side wall in my almost new F1's!! pain in the ass as they cost me £100 each and the tyre monkey says he can't plu it to repair them. £25 and a 10 day turn around to get them done by a vulcaniser repair guy (no not star trek!!) still doesn't help me .... I have 245/40/18's all round I also have two spare 235/40/18 (total diameter is 1.23% out). am I asking for trouble running them temporarily whilst my tyre is being fixed? anyone run similar differences?