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Registered
2016 XTS FWD Platinum
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1,092 Posts
Discussion Starter #1
Anyone have experience replacing their tires on their STS? I just replaced
mine and it seems the car now has a problem. Whenever I accelerate onto a
freeway or attempt to pass someone, my traction control system engages for no
reason, causing me to not be able to accelerate as fast as I would like. I
have to let off the accelerator to clear the message and then I can accelerate
again, unless I punch it and then the same thing happens again. I took it
into the dealer and they finally figured out that the front tires were going
about 3 mph faster than the rear tires. When I replaced the tires, I used the
exact same tires that came with the car. The front ones are a little smaller
than the rears. The dealer said the new tires appear to be defective, even
though they are the right tires. They used a stock car, just like mine, and
swapped the front tires and the problem went away. I called the place where
I got the tires and they called Michelin. There is apparently a special tire
for the STS. It is the exact same size, tread and rating but the heat
expansion is different or something like that. Michelin is replacing the tires at
no charge. They will be in tomorrow.

Anyone have a similar experience?

Max
 

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Registered
2005 STS Luxury Performance
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111 Posts
sound to me like they should have been able to just recalibrate the the wheel sensors for the new tires? Think thats whats done when folks upgrade to larger diameter rims etc. I'm betting the tires you had were marked wrong or something and were actually a smaller tire throwing off your speedo etc.
 

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Registered
2016 XTS FWD Platinum
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1,092 Posts
Discussion Starter #3
Well, I got the new tires today and the car drives perfect again! I can punch it again and no 'TRACTION ACTIVE' message! That was so strange. Everything about the tire is identical--the size, the tread, the rating, except for the expansion rate. The tire guy also said the tire casing is more firm. Everything about the tire is the same except there is a liitle 'p' next to the wrong one when ordering it. I also checked with the dealer and the tech did ride in the car with the Tech II attached, monitoring the speed of each wheel from the wheel speed sensors. That's how they figured out the speed difference.

So beware when getting new tires for your car. Something that seems so insignificant can have such a big impact!

Max
 

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Sedan de Ville, CTS
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4,764 Posts
Fascinating story. I know that diff sizes will do that, but the idea that all 4 tires are marked with same size, and the reality of life shows otherwise, that is amazing to see a mistake like that. Well, I think so.
 
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