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car drifts to the right after new tires and alignment

my car tracked straight until I put on 4 new Michlein Pilot Sport A/S tires. I took it to Mercedes for a 4 wheel alignment. Still drifted right. Tire store pit on 2 new front tires. Still drifts right. Mercedes says it must be the tires. What do I do?


  • edited April 2010
    Rotate the tires to see if the drift changes.
  • edited April 2010
    Thanks for your reply. Is it OK to reverse the front tires even if they are directional.
    As you know the fronts and backs are staggered. If I reverse the fronts and it still drifts right does that confirm that the alignment is not on spec?
  • edited April 2010
    Alignment specifications are not edicts from Olympus. My 'from the hip' guess on this situation is the dealer is standing fast on his "by the book" specifications as read on his equipment while the tire dealer has done all he can to prove that the tires are not defective, leaving you in the Catch 22. Find a locally owned alignment shop and explain the situation. He may tell you more tales of similar problems than you want to hear. If he's good he'll drive the car before and after aligning it.
  • edited April 2010
    Thanks very much Rod. I am thinking since I already paid $190.00 to the MB dealer to have him drive the car with me in it. if you take your hands off of the sterring wheel regardless of the pitch of the road you can see that the steering wheel cantors very slightly to the right.
    I appreciate your response. tough to spend $1,500.00 on tires and $200.00 on alignment and not have the car drive straight.
  • edited April 2010
    I agree with Rod. I have experience with the Michelin Pilot tires and they are very good tires. I recommend them all the time. The alignment was botched by the dealership.
  • edited April 2010
    I've fixed this problem by rotating the front tires side to side. In your case, you're going to have dismount and remount the tires since they're directional.

    Ed B.
  • edited April 2010
    Any chance the alignment is off?
    If you have the printout of the alignment could you check or post the specs on the alignment? (especially as regards caster and to a lesser extent, camber)

    Hopefully the track (or thrust angle) is correct also. (something that can kind of get overlooked)

    Pulling can certainly be a sign of tire bias but having it do this on two sets of new tires sounds odd at least. I'd rotate the 2 front ones side to side and if the problem is still there my feeling is that an alignment problem exists. (again, look at those caster specs very closely)
  • edited April 2010
    Simple test: Swap the front tires side to side.

    If the drift completely chnages direction, the problem 100% in the tires - a property called conicity.

    If the drift doesn't change at all, then the problem is 100% in the vehicle - likely alignment.

    If the drift disappears, or is substantially changed (other than a 100% change in direction), then both the tires and the vehicle are contibuting to the situation.
  • edited April 2010
    It is entirely possible that the alignment was done poorly, either due to operator error or equipment out of calibration. My bet is on either of those, not the tires. Another possibility is that a car jockey at the dealership hit a curb too hard and does not want to tell anyone.
  • edited October 2010
    You don't show how or old or new your MB is. However just a quick check you can do is check the air pressure in the tires to hopefully triple confirm at this point.
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