Hunt carbon rim exploded while inflating
12-08-23, 07:05 AM
#26
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As from the information listed on our site
12-08-23, 07:06 AM
#27
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I saw this on Facebook ..... "My friend tried seating the tire but unbeknownst to him there was a leak in the rim tape and the wheel was filling up with air and had no where to escape until suddenly it exploded. Unbelievable!"
12-08-23, 07:42 AM
#28
A 40 psi max for a 38mm tire is unrealistically low.
I inflate my Barlow Pass rear tire to about 50psi, consistent with their guidelines.
https://www.renehersecycles.com/tire...re-calculator/
If my rims said 100 psi max, I wouldn't think twice about pumping my tires up to 50 psi. If Hunt Rims really can't handle going over 40 psi for what is considered a thin gravel or standard all-road tire, then they really need to re-think that 100 psi max label on a gravel rim. Nobody rides 26 mm tires on gravel rims.
I inflate my Barlow Pass rear tire to about 50psi, consistent with their guidelines.
https://www.renehersecycles.com/tire...re-calculator/
If my rims said 100 psi max, I wouldn't think twice about pumping my tires up to 50 psi. If Hunt Rims really can't handle going over 40 psi for what is considered a thin gravel or standard all-road tire, then they really need to re-think that 100 psi max label on a gravel rim. Nobody rides 26 mm tires on gravel rims.
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12-08-23, 07:50 AM
#29
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interesting thread. Thanks to all.
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12-08-23, 10:46 AM
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Customer: I put 80 psi into your 100 psi rim and it assploded. What gives?
Hunt: That's a different kind of pressure!
BF members: Yeah, didn't you know that?
Self, shaking head: Sheeesh!
Memo to Hunt: Wrap some of them crabon fiberees following the cross-section AROUND them hoops, so they don't split apart!
Memo to self: Avoid Hunt wheels, as you would crabon fiberee submarines!
Memo to BF members: The OP is not lucky, and the manufacturer is not blameless. Sheeesh!
Hunt: That's a different kind of pressure!
BF members: Yeah, didn't you know that?
Self, shaking head: Sheeesh!
Memo to Hunt: Wrap some of them crabon fiberees following the cross-section AROUND them hoops, so they don't split apart!
Memo to self: Avoid Hunt wheels, as you would crabon fiberee submarines!
Memo to BF members: The OP is not lucky, and the manufacturer is not blameless. Sheeesh!
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12-08-23, 11:10 AM
#31
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He put a hundred into a 50 (or whatever) rim with no functional understanding of applied basic 4th grade math concepts. (multiplication.)
Hunt is being very generous about what is plainly user error.
12-08-23, 11:26 AM
#32
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A 40 psi max for a 38mm tire is unrealistically low.
I inflate my Barlow Pass rear tire to about 50psi, consistent with their guidelines.
https://www.renehersecycles.com/tire...re-calculator/
If my rims said 100 psi max, I wouldn't think twice about pumping my tires up to 50 psi. If Hunt Rims really can't handle going over 40 psi for what is considered a thin gravel or standard all-road tire, then they really need to re-think that 100 psi max label on a gravel rim. Nobody rides 26 mm tires on gravel rims.
I inflate my Barlow Pass rear tire to about 50psi, consistent with their guidelines.
https://www.renehersecycles.com/tire...re-calculator/
If my rims said 100 psi max, I wouldn't think twice about pumping my tires up to 50 psi. If Hunt Rims really can't handle going over 40 psi for what is considered a thin gravel or standard all-road tire, then they really need to re-think that 100 psi max label on a gravel rim. Nobody rides 26 mm tires on gravel rims.
they say in the email that 38c = 40psi, but 28c = 100psi. it should be more like 73psi. even if we take the 100psi as only suitable for 25c, should still be around 65psi.
there's also the discrepancy between the email (38c = 40psi) and the manual (35c-45c = 45psi). by that statement, if the rim can do 45psi on a 45mm tire, it should be able to do 53psi on a 38mm tire. with the linear relationship of the abstract formula, we have anywhere from 40-73psi. i would not buy a rim that had a max of 40psi at 38mm, even though i run low pressures. every time i seated a tire i'd be hiding around the corner.
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12-08-23, 12:41 PM
#33
The "usual" advice is to fill your tires below whichever number (tire or rim) is smaller for max pressure.
The max for Barlow Pass is 75, and error bars of ±5 psi aren't unheard of.
One would have to know to look for the fine print on Hunt's website to see that the true recommended max psi threshold is nowhere near that.
They need to re-think their label, or perhaps their rim design.
(Having said all that, 50 psi is probably too high for most of my applications. When I mount one of these tires, I usually inflate mine partially, let it sit overnight to settle in, and then slowly pump it up to 50 psi, and this is on hooked aluminum Hed Belgium+ rims.)
The max for Barlow Pass is 75, and error bars of ±5 psi aren't unheard of.
One would have to know to look for the fine print on Hunt's website to see that the true recommended max psi threshold is nowhere near that.
They need to re-think their label, or perhaps their rim design.
(Having said all that, 50 psi is probably too high for most of my applications. When I mount one of these tires, I usually inflate mine partially, let it sit overnight to settle in, and then slowly pump it up to 50 psi, and this is on hooked aluminum Hed Belgium+ rims.)
12-08-23, 03:12 PM
#34
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I guess those ENVE wheels do not have drain holes?
12-08-23, 03:32 PM
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Never had such a problem with my alloy rims and regular tubed tires.
12-08-23, 03:38 PM
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I bet this type of stuff happens regularly not only to CF rims but also to CF frames and other components. The thing is that most of the people that experience those type of failures are not members of bike forums so we don't really know how frequent CF failures are.
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12-08-23, 03:42 PM
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12-08-23, 04:01 PM
#38
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Appreciate all the feedback. Was going slow, little bursts to try to get the bead to pop, then indeed it popped.
40 psi on 38’s seems awfully low to me, especially if I’m staying in town for the ride, no dirt.
I mentioned internal cavity being the issue to Hunt, said no, it was lip pressure.
40 psi on 38’s seems awfully low to me, especially if I’m staying in town for the ride, no dirt.
I mentioned internal cavity being the issue to Hunt, said no, it was lip pressure.
12-08-23, 04:27 PM
#39
^^^
^^^
I have never seen anything like that and would have never thought something like that could happen.
^^^I have never seen anything like that and would have never thought something like that could happen.
12-08-23, 04:56 PM
#41
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12-08-23, 05:34 PM
#42
Your logic is stunning. You just invented a bunch of imaginary people and came to the conclusion that we don’t hear about all their regular CF failures because they are not members of bike forums. 👏
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12-08-23, 05:50 PM
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12-08-23, 05:58 PM
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A 40 PSI maximum limit on 700x38c tires is indeed quite low. But maybe my rims are just wider.
12-08-23, 06:14 PM
#45
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I've had several customers who have. It's usually been a dad walking in the store, incredulous that the rim he's holding could have a giant split down the middle or the brake track is doing it's best to go on vacation. Usually combined with a story that his kid got hit by a car or somethin' and is not telling the truth. The other usual crowd, sensibly, is the homeless community that tends to use BMX bike for transportation. So maybe the impression is skewed. Either way, I've lost count.
Thus far I've gathered that for most people Force=pressure x area is just too complicated, and if a thing failed, it's the manufacturers fault for making stupid garbage...Never their own fault for using a thing wrong in the first place.
The customer failures I have seen have pretty consistently been 2" tires at road bike pressures. (100+) 'cause some bmx kid thinks higher pressure=faster or to avoid pinch flats as he makes a landing at the skate park.
This is why cheap stuff is made to be idiot proof.
Thus far I've gathered that for most people Force=pressure x area is just too complicated, and if a thing failed, it's the manufacturers fault for making stupid garbage...Never their own fault for using a thing wrong in the first place.
The customer failures I have seen have pretty consistently been 2" tires at road bike pressures. (100+) 'cause some bmx kid thinks higher pressure=faster or to avoid pinch flats as he makes a landing at the skate park.
This is why cheap stuff is made to be idiot proof.
Last edited by base2; 12-08-23 at 07:14 PM.
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12-08-23, 06:51 PM
#46
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So, the key to keeping your CF frames intact is clearly to join Bike Forums.
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12-08-23, 07:34 PM
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There are a lot of CF failures which you will will never hear about, because people who experienced those failures never post it on social media. The failures you hear about on bikeforums and other social media platforms are just a tip of the iceberg a small fraction of a bigger problem that's out there.
12-08-23, 08:02 PM
#48
There are a lot of CF failures which you will will never hear about, because people who experienced those failures never post it on social media. The failures you hear about on bikeforums and other social media platforms are just a tip of the iceberg a small fraction of a bigger problem that's out there.
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12-08-23, 08:40 PM
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interesting article on tubeless and rim pressures and spokes loosening https://velo.outsideonline.com/road/...-tension-drop/
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12-08-23, 08:56 PM
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