Weird internal tire cracking - deformation
 

Rear Wheel: LE37 18x8.5 +50
Rear Tires: 255/35/18 Toyo Proxies R1R (3 years old, 10,000 miles)

Recently blew a tire while driving locally and saw some deformation on the inner shoulder of the tire. When I went to swap them out, I noticed that the inside of the tire had a crack and "split" causing the blow-up. I had an alignment done recently but nothing was off.

I'm hoping someone could shed some light on this.

https://cimg1.ibsrv.net/gimg/www.s2k...5188ef3108.jpg

Lots of meat still on tire with only 10k miles.
https://cimg4.ibsrv.net/gimg/www.s2k...8c3ed85fef.jpg

Deformation of the rear tire - inner, with blow-out
https://cimg6.ibsrv.net/gimg/www.s2k...e00825253e.jpg

Inside of the wheel with cracking
https://cimg8.ibsrv.net/gimg/www.s2k...c946d754b2.jpg

Another shot of the cracking.
https://cimg0.ibsrv.net/gimg/www.s2k...d8c277775f.jpg

Same - cracking

Maybe its been driven with a flat tyre.

Tires will delaminate when excessively hot as happens when run under-inflated. Any chance of that?

-- Chuck

Have the tires ever been exposed to cold temperatures? Extreme Performance Summer tires that are exposed to cold (below freezing) weather will form cracks and will fail. See this advisory from Toyo on your specific tires: https://toyo-arhxo0vh6d1oh9i0c.stack..._-10172017.pdf

Hey Guys, thanks for the replies:

1) Hasn't been driven as a flat - would the inside-tire cracks show up on both sides?
2) Unlikely that they were under-inflated
3) The tires haven't been exposed to cold temperatures. Sat most of the time in a garage in San Francisco.

The driver side tire is also showing the same deformation, but to a lesser degree. I had it remounted inside out and moved it to the passenger side so now the deformation is on the outside.

After replacing the blow-out with a new tire and remounting, the car drives much better. I was feeling some vibration throughout the car and steering wheel before.