Strange tire wear - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

PandaBRZ · 04-01-2016, 11:47 PM

Hey, guys.

I went to adjust my AST coilovers today and noticed the inside shoulders of all my tires was wearing really oddly. It's almost squared off and parts are chunking.

My Michelin Pilot Super Sports are at the end of their life, but I haven't seen tires wear this way before.

My alignment is 0 toe all around -1.3° of camber in the front and -1.5° in the back. The fronts have noticeably worse wear than the rears. Strange thing is that read wear is even across the tire, except for the inner shoulders.

Any idea what's causing this? Is it just normal for tires at the end of their life to chunk?

WRBrzRX · 04-02-2016, 08:44 AM

theyre toast friend

PandaBRZ · 04-02-2016, 12:41 PM

Quote:

Originally Posted by WRBrzRX

theyre toast friend

Yep. Just curious why the inner wear is so severe.

Tcoat · 04-02-2016, 12:47 PM

http://www.procarcare.com/includes/c...dtirewear.html

"One Side Wear
When an inner or outer rib wears faster than than the rest of the tire, the need for wheel alignment is indicated. There is excessive camber in the front suspension, causing the wheel to lean too much to the inside or outside and putting too much load on one side of the tire. The car may simply need the wheels aligned, but misalignment could be due to sagging springs, worn ball joints, or worn control arm bushings. Because load has a great affect on alignment, be sure the car is loaded the way it's normally driven when you have the wheels aligned; this is particularly important with independent rear suspension cars."

PandaBRZ · 04-02-2016, 12:49 PM

Frustrating that this happened after new coilovers and alignment. I'll just replace the tires and watch the wear closely.

Mr.ac · 04-02-2016, 02:58 PM

Never been to a track day or autox eh?

New tires and alginment (take it to an alignment shop, don't diy it.) . Problem fixed. Good day.

SmartedPanda · 04-02-2016, 03:13 PM

Quote:

Originally Posted by PandaBRZ

Frustrating that this happened after new coilovers and alignment. I'll just replace the tires and watch the wear closely.

How many miles did you drive with the new coilovers overall?
How much time between installing coilovers and then alignment?
What's your camber at?

Sounds like too much camber or bad alignment or both.

2ZZW30 · 04-02-2016, 03:19 PM

Looks like toe wear to me but if your specs are actually what you quoted you shouldn't be having extreme wear like that.

PandaBRZ · 04-03-2016, 02:19 AM

Quote:

Originally Posted by SmartedPanda

How many miles did you drive with the new coilovers overall?
How much time between installing coilovers and then alignment?
What's your camber at?

Sounds like too much camber or bad alignment or both.

I've driven 3k miles on the coilovers overall. The car was aligned immediately after installing them. Camber is at -1.3 in the front and -1.5 in the rear.

I'm thinking @Tcoat was right about the springs settling after the install and affecting the alignment.

At this rate, I'm going to get a new set of tires and another alignment just to be safe.

Clipdat · 04-03-2016, 04:32 PM

I would try to convince the place that did your original alignment to give you another one free of charge, based on the assumption that they should've had you come back for the alignment after driving around post install for a week or so.

Quote:

Originally Posted by PandaBRZ

I've driven 3k miles on the coilovers overall. The car was aligned immediately after installing them. Camber is at -1.3 in the front and -1.5 in the rear.

I'm thinking @Tcoat was right about the springs settling after the install and affecting the alignment.

At this rate, I'm going to get a new set of tires and another alignment just to be safe.

EAGLE5 · 04-03-2016, 04:53 PM

Ya. Things seem to need time to settle.

EAGLE5 · 04-03-2016, 04:56 PM

Driving fast also messes things up. I can't imagine you bought those expensive coilovers just to drive slowly.

PandaBRZ · 04-18-2016, 02:22 AM

Just a quick update for everyone.

I had the car's alignment checked and everything was up to spec as when I had the coilovers installed. That means it wasn't the alignment settings causing the wear, but a defect in the tire at the end of its life. It seems to me that the MPSS deteriorate rapidly towards the end of its life, kinda like a Die Hard battery. When it dies, it DIES.

I replaced them with another set of MPSS and the wear is fine after 1,000 miles. I'll keep an eye on the tires and will report back any anomalies.

04-02-2016, 12:47 PM	#4
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,845 Thanks: 61,656 Thanked 108,283 Times in 46,456 Posts Mentioned: 2495 Post(s) Tagged: 50 Thread(s)	http://www.procarcare.com/includes/c...dtirewear.html "One Side Wear When an inner or outer rib wears faster than than the rest of the tire, the need for wheel alignment is indicated. There is excessive camber in the front suspension, causing the wheel to lean too much to the inside or outside and putting too much load on one side of the tire. The car may simply need the wheels aligned, but misalignment could be due to sagging springs, worn ball joints, or worn control arm bushings. Because load has a great affect on alignment, be sure the car is loaded the way it's normally driven when you have the wheels aligned; this is particularly important with independent rear suspension cars." __________________ Racecar spelled backwards is Racecar, because Racecar.

04-02-2016, 02:58 PM	#6
Mr.ac [insert cool phrase here] Join Date: Aug 2015 Drives: BRZ Premium Location: Central Coast CA Posts: 2,369 Thanks: 709 Thanked 1,558 Times in 930 Posts Mentioned: 30 Post(s) Tagged: 0 Thread(s)	Never been to a track day or autox eh? New tires and alginment (take it to an alignment shop, don't diy it.) . Problem fixed. Good day. __________________ New daily driver - Subaru BRZ Premium Weekend fun/track car - '91 MR2 Turbo Gen3 Old daily driver - '88 MR2 Supercharged

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04-02-2016, 08:44 AM	#2
WRBrzRX Senior Member Join Date: Nov 2015 Drives: runs&drives Location: CA Posts: 123 Thanks: 304 Thanked 95 Times in 55 Posts Mentioned: 3 Post(s) Tagged: 1 Thread(s)	theyre toast friend

04-02-2016, 03:19 PM	#8
2ZZW30 Member Join Date: Feb 2016 Drives: 2000 Toyota MR2 Spyder Location: Doylestown Pa Posts: 35 Thanks: 19 Thanked 15 Times in 9 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Looks like toe wear to me but if your specs are actually what you quoted you shouldn't be having extreme wear like that.

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