HELP: second blow out in 2 weeks.
Lexus Test Driver
Joined: Nov 2015
Posts: 1,302
Likes: 17
From: CA
It looks like you have negative camber and massive inside wear. Or was that a result of the failure?
I would be leary of running that low load rating. The sidewall strength is dictated by that number. You have to remember, even though simple math may seem like it would work, during cornering, the weight on any one wheel could go up dramatically.
Simple Physics.
Standing still and it may be equal between the same axles--although the front of our car has more weight--moving and cornering and that tire is carrying a ton of weight and it's all on the sidewall. 25-75% more depending on the angle, load shift, etc. And if you have negative camber, the amount of force on the inner wheel sidewall is enormous.
Also, the inside of our wheel wells, the front at least, is where most of the engine heat gets kicked out. If you had low air pressure, that would mean your tires are running hotter than normal. Add the massive heat sink next to the inner front wheels and it could degrade the strength of those tires.
Bad alignment, inappropriate load rating, under inflation + cheap tires can all lead to its catastrophic downfall.
I would be leary of running that low load rating. The sidewall strength is dictated by that number. You have to remember, even though simple math may seem like it would work, during cornering, the weight on any one wheel could go up dramatically.
Simple Physics.
Standing still and it may be equal between the same axles--although the front of our car has more weight--moving and cornering and that tire is carrying a ton of weight and it's all on the sidewall. 25-75% more depending on the angle, load shift, etc. And if you have negative camber, the amount of force on the inner wheel sidewall is enormous.
Also, the inside of our wheel wells, the front at least, is where most of the engine heat gets kicked out. If you had low air pressure, that would mean your tires are running hotter than normal. Add the massive heat sink next to the inner front wheels and it could degrade the strength of those tires.
Bad alignment, inappropriate load rating, under inflation + cheap tires can all lead to its catastrophic downfall.
Pole Position
Joined: Mar 2016
Posts: 2,598
Likes: 300
From: Missouri
It looks like you have negative camber and massive inside wear. Or was that a result of the failure?
I would be leary of running that low load rating. The sidewall strength is dictated by that number. You have to remember, even though simple math may seem like it would work, during cornering, the weight on any one wheel could go up dramatically.
Simple Physics.
Standing still and it may be equal between the same axles--although the front of our car has more weight--moving and cornering and that tire is carrying a ton of weight and it's all on the sidewall. 25-75% more depending on the angle, load shift, etc. And if you have negative camber, the amount of force on the inner wheel sidewall is enormous.
Also, the inside of our wheel wells, the front at least, is where most of the engine heat gets kicked out. If you had low air pressure, that would mean your tires are running hotter than normal. Add the massive heat sink next to the inner front wheels and it could degrade the strength of those tires.
Bad alignment, inappropriate load rating, under inflation + cheap tires can all lead to its catastrophic downfall.
I would be leary of running that low load rating. The sidewall strength is dictated by that number. You have to remember, even though simple math may seem like it would work, during cornering, the weight on any one wheel could go up dramatically.
Simple Physics.
Standing still and it may be equal between the same axles--although the front of our car has more weight--moving and cornering and that tire is carrying a ton of weight and it's all on the sidewall. 25-75% more depending on the angle, load shift, etc. And if you have negative camber, the amount of force on the inner wheel sidewall is enormous.
Also, the inside of our wheel wells, the front at least, is where most of the engine heat gets kicked out. If you had low air pressure, that would mean your tires are running hotter than normal. Add the massive heat sink next to the inner front wheels and it could degrade the strength of those tires.
Bad alignment, inappropriate load rating, under inflation + cheap tires can all lead to its catastrophic downfall.
Lexus Test Driver
Joined: Nov 2015
Posts: 1,302
Likes: 17
From: CA
His alignment could have gotten worse between then and now. He may have been riding on the razor's edge with the first set but if his camber is as off as it seems to be, it makes perfect sense why those inner sidewalls blew out.
Way under rated tires + a magnification of that weight on the inner wheel sidewall due to negative camber (plus other misc elements) = catastrophe. If his camber was better, it would still be dangerous in my opinion and just by sheer luck he didn't blow things out. That negative camber just amplifies that weight on the inner sidewall and being how it's way underrated to begin with, goodbye tire.
Way under rated tires + a magnification of that weight on the inner wheel sidewall due to negative camber (plus other misc elements) = catastrophe. If his camber was better, it would still be dangerous in my opinion and just by sheer luck he didn't blow things out. That negative camber just amplifies that weight on the inner sidewall and being how it's way underrated to begin with, goodbye tire.
Pole Position
Joined: Mar 2016
Posts: 2,598
Likes: 300
From: Missouri
His alignment could have gotten worse between then and now. He may have been riding on the razor's edge with the first set but if his camber is as off as it seems to be, it makes perfect sense why those inner sidewalls blew out.
Way under rated tires + a magnification of that weight on the inner wheel sidewall due to negative camber (plus other misc elements) = catastrophe. If his camber was better, it would still be dangerous in my opinion and just by sheer luck he didn't blow things out. That negative camber just amplifies that weight on the inner sidewall and being how it's way underrated to begin with, goodbye tire.
Way under rated tires + a magnification of that weight on the inner wheel sidewall due to negative camber (plus other misc elements) = catastrophe. If his camber was better, it would still be dangerous in my opinion and just by sheer luck he didn't blow things out. That negative camber just amplifies that weight on the inner sidewall and being how it's way underrated to begin with, goodbye tire.
Instructor
Joined: Nov 2014
Posts: 758
Likes: 26
From: INACTIVE
I put 195,000 miles on a vehicle without an alignment. When I attempted to get it aligned around 60k, the service advisor giggled and said we only align if there is a concern. So, absent major suspension work or old tire wear issues focus concern elsewhere
Pole Position
Joined: Mar 2016
Posts: 2,598
Likes: 300
From: Missouri
My dealer checks alignment every time the car comes in (complimentary). IMO it's best to catch minor alignment issues early before things get out of whack long enough to cause uneven tire wear or suspension issues. Of course unscrupulous shops may use this as an excuse to perform unnecessary work.
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