Hi all, I've had a vibration in my car since i got it. Initially I put it down to bad balancing and lived with it. I had the last tyre place try 3 times to get the vibration out. Today I tried another tyre place and they did the regular balancing and a road force balance as well. Road force is where they apply load to the tyre and spin it to determine the best place on the rim for the tyre. The test found out that two tyres which are on the front surprise, surprise, were out so much that they could not get a proper balance hence the vibration. The tyre guy told me they have had that before and they have had sent tyres back (goodyear/dunlop) because they were so far out. He suggested i try for a warranty claim either thru brigestone or Holden as the tyres are not up to scratch. First thing I thought was yeah sure, they'll claim I flat spotted them, burnouts under inflated or any other excuse. The tyre guy told me that is not the case as the casing or walls of the tyre have the fault during manufacture and have either too much or too little rubber thickness which is causing the weight discrepancy. Anyway, im going to call bridgestone first to see what they deem acceptable in regard to weight difference and go from there. Has anyone else heard or had experience with this or is the tyre guy just relieving himself in my pocket? out of interest my tyre results are LHF 11.5kg RHF 10.5kg LHR 6.5kg RHR 4.0kg fronts are now on the rear which has taken the vibration out dramatically.