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Busted RS4 Tires

 
Old Feb 10, 2019, 05:00 PM
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Busted RS4 Tires




I picked up my Evo X from the shop where I was getting things fixed and some goodies put on, including a new set of Hankook RS4s. I put about 400 miles on them commuting and then went up to Thunderhill for a track day yesterday. First 20 minute session was about 40 degrees and a bit damp. Second session was sunny and the track was dry. About fifteen minutes in to the second session I noticed the car pull when braking into turn 1. I finished up the lap at a brisk pace and returned to the padlock and found I had a flat. Picture below,

Two questions. One, is this damage likely due to a tire defect or is it just from driving almost three miles to get off the track. Two, can I get away with just replacing the one tire or do I need to at least replace two?

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Old Feb 11, 2019, 09:13 AM
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Many factors that aren't mentioned but likely All of the above, pressure loss, deflection from running at said lower pressure, and a bit of a thin wall height and a bit over stuffed on the rim size. It all adds up eventually. Two newer ones on the fronts if the other is below 3/32's.
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Old Feb 11, 2019, 09:47 AM
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That has low pressure written all over it
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Old Feb 11, 2019, 11:45 AM
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Yup, needed more tire pressure. I would replace just the one and call it good since you only put 400 miles on them. It will of course depend on how much track wear they all have. You might be able to find just the one you need used online and already worn down to the level you need it.
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Old Feb 11, 2019, 11:48 AM
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Originally Posted by Balrok View Post
Many factors that aren't mentioned but likely All of the above, pressure loss, deflection from running at said lower pressure, and a bit of a thin wall height and a bit over stuffed on the rim size. It all adds up eventually. Two newer ones on the fronts if the other is below 3/32's.
Thanks. Both have well over 3/32, so I'll probably just get one. They are on 9.5" rimes. I reported the problem to Tire Rack but I'm not really expecting them to replace it.

Originally Posted by razorlab View Post
That has low pressure written all over it
Pressure was definitely fine at the start of the session. I looked at the left and right tire speeds on my AIM and it looks like something went wrong on the last turn and I took turn 1 slower than usual, but still fairly quick. So I was definitely run with little or no pressure for almost three miles before exiting the track.
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Old Feb 11, 2019, 08:28 PM
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If you can't find a used one that matches, you could get a new one shaved to match the others.
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Old Feb 19, 2019, 07:37 PM
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What does the outer side wall look like? Do you see a puncture anywhere?
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Old Yesterday, 09:01 AM
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Originally Posted by letsgetthisdone View Post
What does the outer side wall look like? Do you see a puncture anywhere?
Can't see any punctures and side walls look almost like new. They should be coming off today ... the new tire was stuck in Reno last week.
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Old Yesterday, 10:39 AM
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If a tire was run low, it will effect both sidewalls, not just one. Inspect and take pictures of the inside and outside of the outside sidewall for us. We'll be able to tell if it has run flat damage. Having one sidewall pristine and one sidewall ruined points to something other than low pressure; either something cut it or the tire was defective.
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