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What did I do???

Old 06-14-20, 08:35 PM
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Podolak
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What did I do???

I went to hop on my Novato and found the front tire flat. It was a bit odd as I run Marathon XRs. I then found the attached pictures. It looks like the tube blew which then blew a tear in the tire? Is this an over inflation



thing? I ran the tires at 85 and it had been a few days since pumping up.
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Old 06-14-20, 08:45 PM
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In your second picture further to the left of the split that you are holding, the tread appears to either be Patterned and or perished in the grooves.If indeed it is perished, my guess is the tire let go causing the tube to burst.

Barry
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Old 06-14-20, 09:27 PM
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Originally Posted by Barry2 View Post
In your second picture further to the left of the split that you are holding, the tread appears to either be Patterned and or perished in the grooves.If indeed it is perished, my guess is the tire let go causing the tube to burst.

Barry
Agreed. At that pressure a tube will find its way through any cracks in the tire and blow out.
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Old 06-14-20, 09:29 PM
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That tire looks too far to be running at 85 psi,........
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Old 06-14-20, 11:15 PM
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26 x 1.65. Sidewall recommended max was 85. I ran it at that pressure for 13 years. Maybe the rubber broke down and couldn't handle it.
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Old 06-15-20, 03:14 AM
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Or maybe it wore out after 13 years. Or you ran over debris that damaged the tire and eventually caused the failure. You got your money’s worth. Cue the contrarians who think tires should last forever.
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Old 06-15-20, 04:34 AM
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The max pressure is never what you should run - it is the lawyer's warning level "If you run higher than this, your tire may explode and you may crash and die and can't blame us because we told you not to." 60 - 80 PSI is typical for that size.

Agree with others - your tire cracked and tube blew out - unless you remember riding over something very large and very sharp that caused that gash.
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Old 06-15-20, 04:46 AM
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85 is pretty high for a 1.65 tyre. Especially lotsa years at maximum pressure, which is usually just there as a max for seating the bead.
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Old 06-15-20, 06:57 AM
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The order of events here was:

1- Tire cracked / split for some reason.

2- Tube blew through the crack.
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Old 06-15-20, 08:32 AM
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Originally Posted by Kapusta View Post
The order of events here was:

1- Tire cracked / split for some reason.

2- Tube blew through the crack.
I have to disagee...in part. Yes, the tire cracked due to age. But that shouldn’t have much effect on the rubber inside contact with the tube. I would suspect a cut caused by road debris made it all the way through the casing. That, along with the cracked outer rubber, caused the casing to split along the lines of the fabric.

Either way, 13 years is more than enough time on a tire.
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Old 06-15-20, 11:49 AM
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You'll have that with old tires that get weather checked and degraded over time.c






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Old 06-15-20, 12:00 PM
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Originally Posted by jpescatore View Post
The max pressure is never what you should run - it is the lawyer's warning level "If you run higher than this, your tire may explode and you may crash and die and can't blame us because we told you not to." 60 - 80 PSI is typical for that size..
Many years ago I met a Continental rep at the one-off Philadelphia Interbike show. He confessed that the max rating is nowhere near what the tires have been tested to withstand without exploding. Blamed the company lawyers.
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Old 06-15-20, 01:53 PM
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Originally Posted by Barry2 View Post
In your second picture further to the left of the split that you are holding, the tread appears to either be Patterned and or perished in the grooves.If indeed it is perished, my guess is the tire let go causing the tube to burst.
That's what it looks like to me, too. I've had tires go that way, even relatively new ones. How old were the tires?
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Old 06-15-20, 01:58 PM
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Originally Posted by BlazingPedals View Post
That's what it looks like to me, too. I've had tires go that way, even relatively new ones. How old were the tires?
I'll take a wild guess and say 13 years old
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Old 06-15-20, 03:14 PM
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Originally Posted by cyccommute View Post
I have to disagee
I am shocked

.... in part. Yes, the tire cracked due to age. But that shouldn’t have much effect on the rubber inside contact with the tube. I would suspect a cut caused by road debris made it all the way through the casing. That, along with the cracked outer rubber, caused the casing to split along the lines of the fabric.

Either way, 13 years is more than enough time on a tire.
Right. I was not specifying how or why it cracked or split, just that it did. Dry rot, cut, whatever.

My point was that it was all due to the tire, not the tube, as the OP was initially pondering.
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