Swaying with new rear tires.

[Evolution]

But bro, my cousin said my inner tire wear is from the reverse rotation of my brain. I think he is right, it can’t be alignment, I just bought the car a year ago!

Your cousin is probably right. My uncle told me that it's the factory wheels that are the issue. All I needed to do was rotate them front to rear. Guess I threw my money away with the alignment.

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[koby]

Repeating what has been said a million times. The alignment on our cars sucks from the factory. First thing you should do on your way home is get your car aligned. First mod should be an alignment. If you haven't got an alignment, get an alignment. My car like many others was way off and an alignment made it all better. Moral of the story, get an alignment. If that's not clear enough, you need an alignment.

thanks for your input. to be clear, i wasn't asking if the car needs an alignment from the factory. no one is disputing that.

the question was for those who picked up swaying after a direct tire change or replacement with factory sizes.

perhaps the OP can advise if a post tire change alignment was needed to alleviate his issues or changing all 4 tires did it on its own.

 

[FLtrackdays]

thanks for your input. to be clear, i wasn't asking if the car needs an alignment from the factory. no one is disputing that.

the question was for those who picked up swaying after a direct tire change or replacement with factory sizes.

perhaps the OP can advise if a post tire change alignment was needed to alleviate his issues or changing all 4 tires did it on its own.

For others, not you, knowing that’s the 1st thing you do is good. Repeat, I’ve switched my front (or rear) right to left and had success if my tire wear is off. Definitely track dependent if more right (or left) hand turns for example. And I know that’s not what the OP is asking as well but just another problem people can come across.

I have bent my wheel before and had issues. Could be anything on his suspension. Hence why a good race shop or independent mechanic willing to dive a bit deeper - worth it‘s weight. Big dealers will likely brush the issue off. They make their money on book rate as you probably know. In and out burger style. So that’s the last place I’d go ofc.

Are you getting any pull koby or issues similar?

 

[koby]

For others, not you, knowing that’s the 1st thing you do is good. Repeat, I’ve switched my front (or rear) right to left and had success if my tire wear is off. Definitely track dependent if more right (or left) hand turns for example. And I know that’s not what the OP is asking as well but just another problem people can come across.

I have bent my wheel before and had issues. Could be anything on his suspension. Hence why a good race shop or independent mechanic willing to dive a bit deeper - worth it‘s weight. Big dealers will likely brush the issue off. They make their money on book rate as you probably know. In and out burger style. So that’s the last place I’d go ofc.

Are you getting any pull koby or issues similar?

getting an independent alignment is always a good practice. sets a valid baseline. all my cars get this done as a starting point. i have had brand new exotics with horrifying alignment from the factory.

my 23 m/t pulls straight. no issues. however having swapped a full set of winters, it has developed a slight sway. seasonal tire swaps normally wont mess up alignments too bad, so trying to draw from the wisdom of this community to see there was anything particular about the supra that merits another alignment.

 

[FLtrackdays]

getting an independent alignment is always a good practice. sets a valid baseline. all my cars get this done as a starting point. i have had brand new exotics with horrifying alignment from the factory.

my 23 m/t pulls straight. no issues. however having swapped a full set of winters, it has developed a slight sway. seasonal tire swaps normally wont mess up alignments too bad, so trying to draw from the wisdom of this community to see there was anything particular about the supra that merits another alignment.

Certain tires (brands) can differ on my 18s, where I have more issues, in general. Summer tires that aren’t heat cycled properly for example. Then I put the stock wheels and rubber back on and problems solved, lol. So I’m pretty certain it’s the tire wear for me. I’m not familiar with winter tires at all. Such as if they need any break in

 

[TurboZX10R]

Just so y’all can see this is what a stock wheel Supra with stock tires the way they came from the factory alignment looked like with swift lowering springs. Backstory: took car in for alignment at mom and pop shop after steering rack was replaced and car drove fine no swaying but I didn’t like How it felt compared to before repairs and alignment. Took the car to a performance alignment shop and look how far off some of the specs were.
Moral of the story don’t trust anyone to touch the car go to an actual racing shop for your alignment and stop putting mismatched tires on your vehicle.
END RANT.

 

[koby]

Certain tires (brands) can differ on my 18s, where I have more issues, in general. Summer tires that aren’t heat cycled properly for example. Then I put the stock wheels and rubber back on and problems solved, lol. So I’m pretty certain it’s the tire wear for me. I’m not familiar with winter tires at all. Such as if they need any break in

thanks for the insights. first time trying this brand of winters so wasnt sure if it was the tires, alignment, the bmw electronics or something else.

Fiiddled some more with the tire setting in the menu, and strangely the swaying behaviour went away by setting back to Summer Tires vs logically selecting WInter/All Season after the change. Strange. Suspect that the electronics are incorrectly compensating for recommended smaller winter sizes.

it might also be what you suggest that the tires have broken-in with about 50km of usage. or maybe the 19" performance winters have similar profile to summers than tradition winters.

Anyways, ended up ordering another set of winters from michelin, a make and line that im more familiar with so can do my own winter tire comparison shortly.

given the supra is my winter run-about sports car, thought id experiment with different brand tires.

 

[crcl]

2022 Supra 3.0L here. Went from the factory 19s down to 265/40/18 in the front, 285/40/18 in the rear, had ZERO problems.

Installed MSS kit, got an alignment. Car was fine for few thousand miles.

Was driving in the rain one day and that's when the swaying started. The rear end felt like it was swimming left and right and left and right. Got home, saw the inside of both rear tires was toast, but the rest of the tread was as well. Just not nearly as bad as the inside.

Now, these were PSS all the way around. The fronts still look brand new. As I said, the rears burned up exceptionally quick. So I put Falken 510s on the rear

Same size? 275/35/19 or something else?



That is 1000% an alignment issue. Toe is way out of spec. Any abnormal tire wear is always an alignment issue (or a parts issue that is causing weird alignment issues).

Here is a list of things people should do when the car feels odd, or you have odd tire wear:

1. Get your alignment checked
2. Check your tire pressure
3. Check for bent suspension components
4. Don't go weird sizes on OEM wheels because it looked icy hot at some car parking lot meet. Just because a tire states it can fit on a 10" wide wheel, doesn't mean it will feel fine on a 10" wide wheel.

#1 should be done to ANY Supra as soon as you purchase it. My Supra wanted to kill me every chance it got when I bought it. I did a proper alignment and it all went away.

I've already had an alignment. I had one done after I installed the MSS kit. I think it was too late by the time I got the alignment though, because the inner rears were toast already, I just hadn't noticed it.

So, my situation now is I have PSS on the front, 265/40/18 which still has like... 90% tread life, and new Falken Azenis fk510's on the rear (285/35/18). The rear sway is back, and the VCS light ticks on super wide, easy turns. So, I'm going to get another alignment from a better shop this time. It wasn't until after I purchased the 2 rear tires that I discovered what a temperamental little bitch this car can be, and discovered they don't sell FK510's in 265/40/18. So, I guess I can go up to 275 or down to 255. It's a 10.7 inch wide wheel (I know, weird width, but that's what the Titan website says).

This is the alignment sheet after the first one.

Please note while reading: On the right side, "Before" and "After" are backwards which really messed with me at first. Anyway, I'll get another one and see if it solves the mystery. Be going to the Audi dealership Monday since they have an inground alignment rack which can handle lowered cars.

 

[FLtrackdays]

Be going to the Audi dealership Monday since they have an inground alignment rack which can handle lowered cars.

I hope they do a good job for you. If that doesn’t resolve it, try an independent shop, race preferably. They tend to have more time, concern & expertise (in general).

 

[garner18v]

2022 Supra 3.0L here. Went from the factory 19s down to 265/40/18 in the front, 285/40/18 in the rear, had ZERO problems.

Installed MSS kit, got an alignment. Car was fine for few thousand miles.

Was driving in the rain one day and that's when the swaying started. The rear end felt like it was swimming left and right and left and right. Got home, saw the inside of both rear tires was toast, but the rest of the tread was as well. Just not nearly as bad as the inside.

Now, these were PSS all the way around. The fronts still look brand new. As I said, the rears burned up exceptionally quick. So I put Falken 510s on the rear


I've already had an alignment. I had one done after I installed the MSS kit. I think it was too late by the time I got the alignment though, because the inner rears were toast already, I just hadn't noticed it.

So, my situation now is I have PSS on the front, 265/40/18 which still has like... 90% tread life, and new Falken Azenis fk510's on the rear (285/35/18). The rear sway is back, and the VCS light ticks on super wide, easy turns. So, I'm going to get another alignment from a better shop this time. It wasn't until after I purchased the 2 rear tires that I discovered what a temperamental little bitch this car can be, and discovered they don't sell FK510's in 265/40/18. So, I guess I can go up to 275 or down to 255. It's a 10.7 inch wide wheel (I know, weird width, but that's what the Titan website says).

This is the alignment sheet after the first one.

Please note while reading: On the right side, "Before" and "After" are backwards which really messed with me at first. Anyway, I'll get another paper one and see if it solves the mystery. Be going to the Audi dealership Monday since they have an inground alignment rack which can handle lowered cars.

I have a similar situation with my rear tires. Both of them are toast on the inside, so I'm currently shopping for new ones. How do you like your Falken tires?

 

[crcl]

I have a similar situation with my rear tires. Both of them are toast on the inside, so I'm currently shopping for new ones. How do you like your Falken tires?

I wish I could say, since after *another* alignment, the damn thing is still swaying like crazy in the rear. I really do believe it just has to do with the fronts being different. The sidewall stiffness, tread pattern, etc is just making the car misbehave. So, I'm going to go for 275's in the front with the 510's and see if that doesn't completely solve the issue. The new alignment did show the car was out of whack, but it didn't solve the issue at all. Tire pressures are sitting around 36 right, though they were at 42 when they first put the new rears on.

I think there really isn't anything for it other than to ensure you swap fronts at the same time as rears. Every post I've read about the swaying has one thing in common, and it's we all replaced only the rears and not the fronts. I had zero issues when all 4 tires were the same, but as soon as I swapped rears to the exact same size as the previous set, instant sway and VCS light every time I even thought about making a wide turn. So... will report back once the new shoes arrive and are installed.

 

[A90_p3p]

I wish I could say, since after *another* alignment, the damn thing is still swaying like crazy in the rear. I really do believe it just has to do with the fronts being different. The sidewall stiffness, tread pattern, etc is just making the car misbehave. So, I'm going to go for 275's in the front with the 510's and see if that doesn't completely solve the issue. The new alignment did show the car was out of whack, but it didn't solve the issue at all. Tire pressures are sitting around 36 right, though they were at 42 when they first put the new rears on.

I think there really isn't anything for it other than to ensure you swap fronts at the same time as rears. Every post I've read about the swaying has one thing in common, and it's we all replaced only the rears and not the fronts. I had zero issues when all 4 tires were the same, but as soon as I swapped rears to the exact same size as the previous set, instant sway and VCS light every time I even thought about making a wide turn. So... will report back once the new shoes arrive and are installed.

Did the issue get fixed when you replaced the front to match the rear?

Having the same issue everyone is describing.

 

[FLtrackdays]

Side note: whenever I swap my tires around, ofc you feel it. The car can vibrate at certain speeds, braking, turning, you name it. Eventually my tires settle in, being softer and in a hot climate. But I definitely feel it when I rotate them (left to right or front to back). After a few laps around the track they get softer and feel fantastic. But in the beginning, ugggggghhhhh….

Harder tires will take longer to settle - don’t know the right tecknical word Another thing to consider once alignment is set.

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