[Rob1]

I purchased a used 06 AWD SRX back in Dec, 08 for my wife.

She has noticed as well as I, a slight vibration at higher speeds I.E. Highway.

Since it needed a oil change and the sun roof was squeaking a bit I old her to take it to the local Cadi dealer since its still under factory warranty.

I asked the dealer to balance all the wheels - well they tried and could not as they use a pre programmed balancer?? - anyway, they then informed me the tires on the car are incorrect.

The dealer installed new Cooper All seasons as per our deal but he installed:

P225-60-18 all round.

The Cadi dealer said the tires should be

F - 235-60R-18
R - 255-55R-18

They are also saying that there are error codes appearing when they ran a routine diag check from the TC...he said its related to the tires. He also mentioned that if there are any suspensions issues, they might not be covered by GM since the incorrect tire size is being used?

I have spoken to the selling dealer (not a GM dealer) and I am taking the car in for them to look at?? I guess they want to confirm the tire sizes which the dealer told me is printed on the inside driver door.


Does any of the above make sense?? Are they tires that off to trip computer codes?

Any feedback is appreciated.

Cheers
Rob

 

[NorthernSRX]

I say BS.

Search this forum - there are many who have gone away from the OEM staggered set up to uniform sizes all around and they have lived to tell the tale!

Your speedo and odo will be off by ~1.5% but big whoop!

Frankly, though, the selling dealer goofed - IMO, you should have at least gotten 235s all around. 225 is too narrow a tire for a vehicle the size of the SRX. Still, should not be shooting out error codes on account of a uniform treadwidth all around.

 

[conedoctor]

That is lame, 225 is way to narrow and will look stupid on an 8" wheel.

Same size all around will not hurt you at all ever, if they do not cover you I would fight it hard as they can't prove the tires did any harm.

I was told by the service witer last time I was in that I was going to kill my xfer case by running the same size tire, he said it quite like he was doing me a favour. Ummm hey bonehead what happens when I put my spare on that is not close to any other tire size, the book says I can drive like 5000k or something like that with the spare on, all the diffs are open so it is all good

 

[louisn]

Those Cadillac engineers staggered the tires sizes for a reason.The selling dealer should have KNOWN and told you. I assume it was not a Cadillac dealer?? Many reputable installers will not even install non factory specs tires for insurance reasons. These SUVs are performance orientated and that is what makes it special. Make them do it right. It will be a good lesson for them.

 

[robhersch]

Rob ... I would guess that the 225s would not only be ~1.5" narrower than 255s (better in heavy snow??) but also would reduce the per tire load capacity by 200 to 300 # or maybe 1200 # for the car.

..........................I was told by the service writer last time I was in that I was going to kill my xfer case by running the same size tire, he said it quite like he was doing me a favour. Ummm hey bonehead what happens when I put my spare on that is not close to any other tire size, the book says I can drive like 5000k or something like that with the spare on, all the diffs are open so it is all good

Several tire sellers have given me the same comment, ie you must replace tires per the "sticker_front: 235/60-18, rear: 255/55-18"-(insurance BS?)
note 1) - both of the OEM sizes have exactly the same circumference and 694 revs/mi (per the Miata.net tire size calculator);
note 2) - Michelin Pilot OEM tires say 723 & 717 revs/mi (Tire Rack);
note 3) - Goodyear Response Edge say 718 & 720 revs/mi (TireRack);
note 4) - Michelin Lattitude tires say 703 & 717 revs/mi (Tire Rack);
note 5) - worst case difference is ~1.5-3% and approximately the same difference between the 11/32 tread and worn 3/32 tread !!

My theory is that the only issue should be the potential interference with front wheel turning. I did exchange front & rear wheels tires to test, drove for ~8,000 mi and experience no difference. So, I vote for 4- 255/55-18 !!

I also note that Cadillac offers an optional set of 20" wheels/tires for the V8 (V6 ??) SRX and all 4 are 255s, not staggered !!

Good luck,
robhersch

 

[NorthernSRX]

While it's true that Cadillac's engineers determined that a staggered tire set up would provide optimal performance, I seriously doubt that the car was engineered to only accept the OEM staggered set-up. Like others have pointed out, Cadillac offers a non-staggered 20" wheel package - contradicting the argument that the OEM staggered set-up is essential to avoid problems with the mechanicals.

That being said, I have stuck with the staggered set-up since our first SRX in Nov.'04 as I prefer the weight of the steering that you get from a slightly narrower tire up front. Back in 2005, my tire shop set me up with 255s all around before I committed to what to do about the fronts and the difference was slight but enough to make me stick with the OEM set-up (with all the disadvantages of not being able to rotate them).

YMMV

 

[Rob1]

I have contacted the dealer that I purchased the car from and they are going to be talking to a Cadi dealer.

We'll see what happens and I'll update you all......

 

[Paulie Walnuts]

is anyone running wider that 255's on an 18" rim all around? I have been running the 255's now for 65,000 miles with no trouble - performance iossues - or comments from the Caddy dealer. Northstar and AWD are ok.

I would like to try a bit wider just for the look but I am unsure about fit or performance. Comments please..................

 

[carguy2009]

The recommended tires for 18" wheels are 29.1 & 29 inches in diameter with a tread width of 8.1" front and 8.7" rear. The 225-60-18's are 28.6" in diameter with a 7.6" tread width. I didn't check tire load ratings, if they are in the "ball park" seems the tires would work. My 2 cents!

 

[z06bigbird]

225s, being fairly narrow, are more likely to allow our spouses to do some curb rash to the wheels. A wider tire will stick out past the edge of the rim and generally avoid the curb rash.

One forum member here stated that GM would "have to prove that the wrong tires damaged" the differential. Not true. Once a technician puts a negative comment into the GM computer system, and once a service mgr signs off on it (figuratively speaking), GM considers it gospel. The customer is the one who must prove. At the risk of being repetitive, GM doesn't have to prove didley. That is why the customer needs to maintain an open discussion with service advisor and service mgr whenever anything unusual like this comes up. GM considers the service mgr to be the expert, and GM will typically accept whatever he/she recommends.

 

[Rob1]

Update:

The dealer is replacing the tires to factory spec. He's putting on Toyo brand.

Asked me to meet him in the middle for some of the cost - $200 bucks.

At this point it's cheaper then me buying a set of four...at first I did not agree but gave in as this has been draggin on to long.

Cheers

 

[conedoctor]

These tires will not hurt the car, if they say it caused the xfer case to die you would be off to fight it as they can't prove it did and cannot just void the coverage. Magnuson-Moss Act

Yes Cadillac put staggered tires on the car, was it some magic way to make it more stable or anything, I doubt it. The staggered setup looks nice, maybe a little lighter steering and less wind resistance in the front but I can't see much else.

People who are worried about loosing control because the tires are all the same size are just worried, I would say 99.9% of SRX drivers will never get the car to the limit of the tires where they would say "geez I need wider tires" or "I am getting a bit of oversteer because my front tires are 20mm bigger than they should be"

Just IMO

 

[louisn]

Update:

The dealer is replacing the tires to factory spec. He's putting on Toyo brand.

Asked me to meet him in the middle for some of the cost - $200 bucks.

At this point it's cheaper then me buying a set of four...at first I did not agree but gave in as this has been draggin on to long.

Cheers

Not too bad.. I bet those tires cost at least $200 each. The dealer should pay for the right tires but sometimes compromising is OK to get it done and avoid more tension. Enjoy your SRX-mine is truly a great vehicle.:thumbsup:

 

[NorthernSRX]

Update:

The dealer is replacing the tires to factory spec. He's putting on Toyo brand.

Asked me to meet him in the middle for some of the cost - $200 bucks.

At this point it's cheaper then me buying a set of four...at first I did not agree but gave in as this has been draggin on to long.

Cheers

Sounds like a decent deal - I'd have forked out the $200 as well.

 

[z06bigbird]

Very gentlemanly to split the cost, esp in today's market. Dealer goodwill/cust assistance has all but disappeared cause of the hard times.

Besides, perhaps in the future, you two can split some other items. Seriously.

Take him a lunch when you get a chance. It will pay off in the long run.

 

[TSS]

Seems like a good compromise. Having a good relationship with your dealer and service advisor/manager, as stated above will pay off. I am a picky SOB, so I am sure to get them a little gift (ie. gift card) at Christmas time with a card thanking them for taking such good care of my cars during the year.

 

[bernardrich]

Had the same issue at McCrae Nissan in Eureka - wrong tires on my vehicle. They used tires that were not manufacturer recommend and then bragged about how great they looked. I bought the vehicle, figured it out that night and tried to have them square it away the next day (6 hour round trip x2 now). All they would do is put cheaper tires on it. Really seemed like false advertising and kind of scammy and cheap to me. I also found missing bolts on the bumper!! I don't think they did a very good job certifying the vehicle.

I purchased a used 06 AWD SRX back in Dec, 08 for my wife.

She has noticed as well as I, a slight vibration at higher speeds I.E. Highway.

Since it needed a oil change and the sun roof was squeaking a bit I old her to take it to the local Cadi dealer since its still under factory warranty.

I asked the dealer to balance all the wheels - well they tried and could not as they use a pre programmed balancer?? - anyway, they then informed me the tires on the car are incorrect.

The dealer installed new Cooper All seasons as per our deal but he installed:

P225-60-18 all round.

The Cadi dealer said the tires should be

F - 235-60R-18
R - 255-55R-18

They are also saying that there are error codes appearing when they ran a routine diag check from the TC...he said its related to the tires. He also mentioned that if there are any suspensions issues, they might not be covered by GM since the incorrect tire size is being used?

I have spoken to the selling dealer (not a GM dealer) and I am taking the car in for them to look at?? I guess they want to confirm the tire sizes which the dealer told me is printed on the inside driver door.


Does any of the above make sense?? Are they tires that off to trip computer codes?

Any feedback is appreciated.

Cheers
Rob

 

[Byrdman]

Had the same issue at McCrae Nissan in Eureka - wrong tires on my vehicle. They used tires that were not manufacturer recommend and then bragged about how great they looked. I bought the vehicle, figured it out that night and tried to have them square it away the next day (6 hour round trip x2 now). All they would do is put cheaper tires on it. Really seemed like false advertising and kind of scammy and cheap to me. I also found missing bolts on the bumper!! I don't think they did a very good job certifying the vehicle.

welcome to the forums! lots of good info here. The thread you're replying to has been dead for 12 years and the member you quoted hasn't been here in four years. Good idea to check dates of posts, plus you can hover your cursor over a member's avatar and see when they last logged on.