Ear protection when pumping tires
#226
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Thanks. Somehow missed that post in the blazing speed this thread is going. That is indeed 145. Not sure which tire Larry is running, but I still wouldn't try to load such a skinny tire with so much weight. Those pressures work best on a nice, smooth velodrome.
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#227
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I probably need an ear protection too but not for exploding tires. One person I live with always talk to me in very loud voice, it's starting to damage my eardrums and my brain.
#228
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I have been pretesting new tubes for my 700c x 25c for many years with low pressure to screen defective tubes.
My last batch of Continental Race tubes 2 of 6 exploded which caused temporary hearing loss. First tubes that did this over all the years.
Now I wear eye and ear protection during test. Also noticed they have quality issues with valve cores not being tighten properly.
My last batch of Continental Race tubes 2 of 6 exploded which caused temporary hearing loss. First tubes that did this over all the years.
Now I wear eye and ear protection during test. Also noticed they have quality issues with valve cores not being tighten properly.
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We all lose sometimes and I lost to heavy hitters. Heck after the ride yesterday I rode home with this gal Linda Jackson (cyclist) - Wikipedia. I mean sure she is lowkey old and washed up now but still, if she trained a bit shed probably smoke us on any race over 100 miles. Nothing wrong with losing to faster people. It makes you stronger
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I have been pretesting new tubes for my 700c x 25c for many years with low pressure to screen defective tubes.
My last batch of Continental Race tubes 2 of 6 exploded which caused temporary hearing loss. First tubes that did this over all the years.
Now I wear eye and ear protection during test. Also noticed they have quality issues with valve cores not being tighten properly.
My last batch of Continental Race tubes 2 of 6 exploded which caused temporary hearing loss. First tubes that did this over all the years.
Now I wear eye and ear protection during test. Also noticed they have quality issues with valve cores not being tighten properly.
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Gotta protect the ears... at work a few months ago I was filling a dewar with liquid nitrogen, and the only PPE I opted for was earmuffs (not required.) My manager happened to come outside and came up behind me and put a face shield on me and handed me the cryo gloves (very much required.) was kind of funny.
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This thread is like a rewrite of Alice in Wonderland.
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Larry is such a gift to this forum.
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Actually, I've seen it happen. Yes, the manufacturers put a little buffer in there, but you're running right at that limit, and piling on more weight is going to increase that (what do you think happens to a tire's pressure when you put more weight onto it?). The cases I have seen claimed pressures between 130 and 150, and most of the time they heard the BANG! (hope you have your ear protection on while riding) and rolled to a stop and change their tube (those usually have huge tears over an inch long, BTW). One of them, on the other hand, was rounding a curve and ended up hitting the guardrail and woke up in the hospital later that day.
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Same reason we respond to half the threads in this forum: to feel morally and intellectually superior to a bunch of strangers. Now to log off the forum and straighten the frames with my MA of Armchair Engineering and PhD in Social Media Psychology.
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Nah im just genuinely happy that they unwittingly pushed me to race, made my ride more interesting. Always a pleasure to have company on the commute even if they are a shadow behind/ahead that i never interact with
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Do you suspect the tube started to poke through the tire and burst on the rim? Honestly people used to ride with high pressures (genejocky said he ran 140 on 23s and he is a big boy only like 40 lbs lighter than me.) Im skeptical that im unable to safely ride 23s or 25s at relatively high pressures. Like sure, the ride quality might suffer, I might even be slower if Big Gravel is right, but being inherently dangerous? There must be things I can do to lessen the chances of failure, even if im pushing the envelope on tire pressure. I was under the impression that once a wheel has been rolling for several miles I can assume the tire is seated properly and im ok to trust my equipment until the tire starts showing obvious wear.
I do remember when many people ran high pressure in their tires racing in the 90's (although they were lighter and didn't carry groceries), but that's also where I saw the big blowouts I mentioned earlier. So in all honestly, you'll probably be fine, but failures could happen. Then again, things could happen at any pressure, on any size tire, etc. My only tire failure related crash was after hitting an uneven crack on the pavement that managed to unseat both of my tires. I had no idea it happened until I took a turn and the bike just slid out from under me. I was running 23mm with 120 psi in them (this was back when I ran exactly what the max was on the sidewall) and weighed 125lb. Stuff happens.
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In response to your actual question, it would be fascinating to measure the decibel level of such a blowout. The closest I could find on the internet was a car tire which apparently is about 88dB from 50 feet away. Instant hearing loss occurs at about 130dB and a tire blowout is definitely not a sustained sound, so you'd need to reach that to have a true need for hearing protection.
Anybody got a decibel meter and want to purposely wreck some tubes?
Anybody got a decibel meter and want to purposely wreck some tubes?
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So you must be riding those new fangled aluminum rims that don't experience metal fatigue? Can you turn me on to those?
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Gotta protect the ears... at work a few months ago I was filling a dewar with liquid nitrogen, and the only PPE I opted for was earmuffs (not required.) My manager happened to come outside and came up behind me and put a face shield on me and handed me the cryo gloves (very much required.) was kind of funny.
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That was what I thought when you made it.
Of course. However, assuming you know what that factor is is a game for fools. Plus, it's not just the possibility of the rim blowing apart. They're also telling you that you can trust the hook to hold a bead up to that pressure. They're also telling you NOT to trust the hook to hold a bead above that pressure.
Of course. However, assuming you know what that factor is is a game for fools. Plus, it's not just the possibility of the rim blowing apart. They're also telling you that you can trust the hook to hold a bead up to that pressure. They're also telling you NOT to trust the hook to hold a bead above that pressure.
As I said, it's about the safety factors the manufactures build into their products. In the case of locomotive boilers, they were routinely proof-tested to four times their MAWP. So in the case of our steam locomotive, the calculated bursting pressure would be about 760 PSI. We never even get CLOSE to that pressure.
Do you really think a rim manufacturer is going to actually put the fail pressure on its rim? Would the lawyers allow that? Or do you think it's more likely that a company like Mavic (whose rims I use, and which did not have a "max" pressure sticker on them when manufactured), would maybe make their rim's failure pressure a little higher than the max? Maybe even 2 times, if not more?
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It's only a race if everyone agrees it's a race. I mean, for decades here we've made fun of riders who think they 'beat' some pro or other because they passed them one time when the pro might have been on a recovery ride.
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#250
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You're postulating a "safety" factor over the recommended max of some size. If you don't really know what that factor is (if indeed it does exist), any time you exceed the spec, you are testing that.
Missed the point on the metal fatigue thing, I see. You were claiming "so far, so good". My point is you really don't know that because you may be accelerating metal fatigue or creating some that wouldn't otherwise occur. Your answer to that is other things can cause metal fatigue, I guess, and that's a profoundly stupid answer.
I'm pretty sure I don't want to be near your steam engine, btw. What you write about running that over spec has the "famous last words" ring to it.
https://allthatsinteresting.com/gene...im%20instantly.