High pressure tire blowout!
10-27-11, 02:16 PM
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High pressure tire blowout!
Today I decided to try a little higher pressure in the rear tire. I have Rubino Pros and the max pressure says 145psi. I normally run the rear at 110 and have had no problems. Today I tried it at 125psi. Got about 1/2 mile down the road, hit a small rock and BANG! Massive blowout. Almost ripped the tire in half. Seriously, the tear almost goes from bead to bead straight across the tire. Had to call a friend to pick me up because there is no way to jerry-rig that into a rideable condition. Anyone else running over 120psi and is the tire more likely to blow at that pressure?
10-27-11, 02:17 PM
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No. Yes.
10-27-11, 02:38 PM
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Im riding on those right now. when i first installed them I got a blowout within 1 mile also. But the tire had a bubble in the sidewall, I took it to the shop and exchanged it for another. As much as I dislike performance bike, they are good about stuff like that and way cheaper than all the other bike shops in the area.
I run them at about 100, when I take them to like 125 I find they are really solid and make for a bumpy ride. I think any higher is not a good idea. I only weigh about 140.
I run them at about 100, when I take them to like 125 I find they are really solid and make for a bumpy ride. I think any higher is not a good idea. I only weigh about 140.
10-27-11, 02:38 PM
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Too many variables. Can depend on tire model, individual tire variation, rim type, your weight, road type, etc.
That said there is seldom a good reason to pump a typical clincher road tire above 115.
I run mine 95F and 100R....but I run Conti Grand Prix 4000s, 23mm width.
That said there is seldom a good reason to pump a typical clincher road tire above 115.
I run mine 95F and 100R....but I run Conti Grand Prix 4000s, 23mm width.
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10-27-11, 02:39 PM
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I have both my tires at about 140 psi (they can take 150) I have been riding with them that way for about 1500 miles and so far no blowouts
10-27-11, 02:44 PM
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Yes, of course it is more likely to blow at higher pressure. And bouncier, with less grip.
10-27-11, 02:46 PM
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Which tires are you going to buy next?
10-27-11, 02:47 PM
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You gonna eat that?
That happened on last week's pub crawl ride. Someone pumped up his tires a little higher than usual (but still within spec, supposedly). Not too far into the ride, BAM! Explosive blowout. We're a nice group, so we waited while he fixed it. A few miles later, his chain popped off. It was a fixie and he didn't get the chain tight enough and going downhill it popped off.... and he didn't have any handbrakes. That was fun. So he fixed the chain, let a little pressure out of his front tire to avoid another mishap, and the rest of the ride went okay.
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10-27-11, 02:50 PM
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I have run my rear tires at 120 forever, as I weigh 215Ibs. That is where I like it. I once had a blowout like that hitting a small rock like you described.
My take? Depending on how you hit the rock, yeah, a blowout can result, but I bet if you hit that same small rock a dozen times, chances are the tire blows two, or at most three times.
My take? Depending on how you hit the rock, yeah, a blowout can result, but I bet if you hit that same small rock a dozen times, chances are the tire blows two, or at most three times.
10-27-11, 02:53 PM
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There really is no need to run that high of pressure. keep it lower for a better ride and more control.
other than that.. seems like a really odd failure. usually it splits the sidewall or blows the bead off the rim. having it fail bead to bead seems excessive.
other than that.. seems like a really odd failure. usually it splits the sidewall or blows the bead off the rim. having it fail bead to bead seems excessive.
10-27-11, 02:56 PM
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Today I decided to try a little higher pressure in the rear tire. I have Rubino Pros and the max pressure says 145psi. I normally run the rear at 110 and have had no problems. Today I tried it at 125psi. Got about 1/2 mile down the road, hit a small rock and BANG! Massive blowout. Almost ripped the tire in half. Seriously, the tear almost goes from bead to bead straight across the tire. Had to call a friend to pick me up because there is no way to jerry-rig that into a rideable condition. Anyone else running over 120psi and is the tire more likely to blow at that pressure?
Tubes explode when rapidly released from the confines of a tire securely mounted to the rim. I doubt the pressure itself was the problem here, but may have helped nudge the tire off the rim, when suggested by the rock it encountered.
Something like this:
Tube escapes from the tire, goes kablooey, taking the tire with it.
Rider changes tube, tire, then shorts.
10-27-11, 02:58 PM
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10-27-11, 03:06 PM
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I found this link to be useful: https://www.michelinbicycletire.com/m...rpressure.view
EDIT
Actually, it was Psimet's formula that I used. I forgot where I got my pressure recommendations from.
"From Psimet's Tip of the Day thread...
Tip 1 - Inflate your tires before every single ride. Know what the proper inflation pressure should be for your tires. Inflation requirements will vary by rider, bike, tires, conditions, etc.
Below you will find equations that you can use to help determine an appropriate starting point using your weight and the tire's size. Adjust from these baselines to suit needs and conditions.
Proper inflation is the easiet way to avoid flats.
Tire Width=20: Pressure(psi) = (0.33 * Rider Weight in lbs) + 63.33
Tire Width=23: Pressure(psi) = (0.33 * Rider Weight in lbs) + 53.33
Tire Width=25: Pressure(psi) = (0.33 * Rider Weight in lbs) + 43.33
Tire Width=28: Pressure(psi) = (0.33 * Rider Weight in lbs) + 33.33
Tire Width=32: Pressure(psi) = (0.17 * Rider Weight in lbs) + 41.67
Tire Width=37: Pressure(psi) = (0.17 * Rider Weight in lbs) + 26.67 "
EDIT
Actually, it was Psimet's formula that I used. I forgot where I got my pressure recommendations from.
"From Psimet's Tip of the Day thread...
Tip 1 - Inflate your tires before every single ride. Know what the proper inflation pressure should be for your tires. Inflation requirements will vary by rider, bike, tires, conditions, etc.
Below you will find equations that you can use to help determine an appropriate starting point using your weight and the tire's size. Adjust from these baselines to suit needs and conditions.
Proper inflation is the easiet way to avoid flats.
Tire Width=20: Pressure(psi) = (0.33 * Rider Weight in lbs) + 63.33
Tire Width=23: Pressure(psi) = (0.33 * Rider Weight in lbs) + 53.33
Tire Width=25: Pressure(psi) = (0.33 * Rider Weight in lbs) + 43.33
Tire Width=28: Pressure(psi) = (0.33 * Rider Weight in lbs) + 33.33
Tire Width=32: Pressure(psi) = (0.17 * Rider Weight in lbs) + 41.67
Tire Width=37: Pressure(psi) = (0.17 * Rider Weight in lbs) + 26.67 "
Last edited by Jaymadd; 10-27-11 at 03:15 PM. Reason: new info
10-27-11, 03:07 PM
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I found this link to be useful: https://www.michelinbicycletire.com/m...rpressure.view
I actually never seen a cyclist's tire blowout but I seen it happen to trucks/sedans on the highway a few times.
10-27-11, 03:09 PM
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10-27-11, 03:17 PM
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10-27-11, 05:24 PM
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That happened on last week's pub crawl ride. Someone pumped up his tires a little higher than usual (but still within spec, supposedly). Not too far into the ride, BAM! Explosive blowout. We're a nice group, so we waited while he fixed it. A few miles later, his chain popped off. It was a fixie and he didn't get the chain tight enough and going downhill it popped off.... and he didn't have any handbrakes. That was fun. So he fixed the chain, let a little pressure out of his front tire to avoid another mishap, and the rest of the ride went okay.
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10-27-11, 05:33 PM
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what kind of tire? I run 110 on the front 120 on the rear of mine...I hit a road snake long ways the other day doing 26mph and nothing, my maviks are still true too. wondering if it was the type of tire you're running.
10-27-11, 08:43 PM
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Pictures. Goes almost 2/3 of the way across the tire. I think that little white ding is where I hit the rock.
10-27-11, 08:45 PM
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I found this link to be useful: https://www.michelinbicycletire.com/m...rpressure.view
EDIT
Actually, it was Psimet's formula that I used. I forgot where I got my pressure recommendations from.
"From Psimet's Tip of the Day thread...
Tip 1 - Inflate your tires before every single ride. Know what the proper inflation pressure should be for your tires. Inflation requirements will vary by rider, bike, tires, conditions, etc.
Below you will find equations that you can use to help determine an appropriate starting point using your weight and the tire's size. Adjust from these baselines to suit needs and conditions.
Proper inflation is the easiet way to avoid flats.
Tire Width=20: Pressure(psi) = (0.33 * Rider Weight in lbs) + 63.33
Tire Width=23: Pressure(psi) = (0.33 * Rider Weight in lbs) + 53.33
Tire Width=25: Pressure(psi) = (0.33 * Rider Weight in lbs) + 43.33
Tire Width=28: Pressure(psi) = (0.33 * Rider Weight in lbs) + 33.33
Tire Width=32: Pressure(psi) = (0.17 * Rider Weight in lbs) + 41.67
Tire Width=37: Pressure(psi) = (0.17 * Rider Weight in lbs) + 26.67 "
EDIT
Actually, it was Psimet's formula that I used. I forgot where I got my pressure recommendations from.
"From Psimet's Tip of the Day thread...
Tip 1 - Inflate your tires before every single ride. Know what the proper inflation pressure should be for your tires. Inflation requirements will vary by rider, bike, tires, conditions, etc.
Below you will find equations that you can use to help determine an appropriate starting point using your weight and the tire's size. Adjust from these baselines to suit needs and conditions.
Proper inflation is the easiet way to avoid flats.
Tire Width=20: Pressure(psi) = (0.33 * Rider Weight in lbs) + 63.33
Tire Width=23: Pressure(psi) = (0.33 * Rider Weight in lbs) + 53.33
Tire Width=25: Pressure(psi) = (0.33 * Rider Weight in lbs) + 43.33
Tire Width=28: Pressure(psi) = (0.33 * Rider Weight in lbs) + 33.33
Tire Width=32: Pressure(psi) = (0.17 * Rider Weight in lbs) + 41.67
Tire Width=37: Pressure(psi) = (0.17 * Rider Weight in lbs) + 26.67 "
10-27-11, 08:46 PM
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Sorry to hijack the thread, but what about minimum tire pressures? I was trying to help my wife have a more comfortable ride by lowering her tire pressure some, only to notice on the tire that it says minimum is 100psi and max is 120psi, it was one of the lower end Vittoria's. I've never really paid attention to having a minimum as I've typically used feel for what works best?
OP I've used those same tires, two sets with no real issues other than a puncture, at 105/110?
Just saw the pics and actually I've used the slicks, which are a little different than the OP...
OP I've used those same tires, two sets with no real issues other than a puncture, at 105/110?
Just saw the pics and actually I've used the slicks, which are a little different than the OP...
Last edited by af2nr; 10-27-11 at 08:48 PM. Reason: New Data
