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Sidewall blowout flats on full carbon clinchers
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 2015-10-19 7:57 PM |
Master  2094  |  Subject: Sidewall blowout flats on full carbon clinchers I imagine there are quite a few people here who are using full carbon clinchers. I bought a Williams 60mm several years ago for my front but shelved it due to it being to flexy and creating brake rub when climbing. I put it back in service on my wifes bike, Cervelo S5 Di2, along with a 60mm Chinese knockoff on the rear. I didn't think she would have any issues since she is 50kgs on a 51 frame. We do a lot of climbing and descending. She has had multiple sidewall blowouts. She is using carbon pads. Is this a problem related to heat buildup? Are other people having the same issues? I recently received a e-mail from the Hincapie Gran Fondo this weekend and full carbon clinchers are banned. I researched this on other sites and saw they were banned in the Levi Gran Fondo also. FWIW she rode full carbon Zipp tubulars for years and never had a flat. |
| 2015-10-20 12:12 AM in reply to: pschriver |
Regular 606   Portland, Oregon | Subject: RE: Sidewall blowout flats on full carbon clinchers Unless she is doing long sustained braking, no, there would not be heat buildup. More likely the pad is rubbing the tire directly, either bad setup or if the wheel is flexing into it. |
| 2015-10-25 12:00 PM in reply to: dfroelich |
Master 2094 | Subject: RE: Sidewall blowout flats on full carbon clinchers She does do extended braking and does favor the rear. The brake pads have been professionally set up and inspected. The pads do not rub the 23mm tire nor does the tire come close to the frame. It is highly doubtful that her 50kg weight causes that much flex. In spite of the ban, many riders at the Fondo still used full carbon clinchers that led to several wrecks and quite a few tire and wheel failures. One of the SAG mechanics commented that it was usually the low end wheels that seemed to have the most issues. Apparently none of the failures were on the high end carbon clinchers and Zipp was pretty well represented. Mostly this is a PSA |
| 2015-10-25 4:22 PM in reply to: 0 |
Veteran 740 The Woodlands, TX | Subject: RE: Sidewall blowout flats on full carbon clinchers Here's a link to a great article Lennard Zinn put together to recap issues that some of the pro teams had at the Tour of Oman this last winter. Lots of blow-outs on a neutralized descent.......apparently with both tubulars and clinchers. Keep in mind that when this happened ambient temps were well above 100-F, and they were descending at way over 50 mph....pretty extreme conditions from a heat standpoint. He goes over typical heat related failure modes for both types of wheels towards the end of the article. http://velonews.competitor.com/2015/02/bikes-and-tech/technical-faq... When you use the term "side wall blow-out", do you mean of the tire itself and not the tube? I guess this is possible (from temps), but my understanding is that the "weak link" from a temperature standpoint for clinchers is typically the tube, not the tire. Edited by g_shotts 2015-10-25 4:26 PM |
| 2015-10-25 5:03 PM in reply to: g_shotts |
Extreme Veteran 3025 Maryland | Subject: RE: Sidewall blowout flats on full carbon clinchers the tire will not melt from heat. Glued tires can have the glue melt, and tubes could melt a bit resulting in a blown tube. I'd check installation. what do you mean by blow out, and what kind of tires? |
| 2015-10-25 5:14 PM in reply to: dmiller5 |
Master 2094 | Subject: RE: Sidewall blowout flats on full carbon clinchers What I have seen in the 2 tires (the second almost brand new) is a dimple on the sidewall like a blister. Both were Continental 4000. I didn't think much about the first and thought it was road damage but the second was odd. It happened immediately after a 3 mile descent. |
| 2015-10-26 7:06 AM in reply to: pschriver |
Member 1748 Exton, PA | Subject: RE: Sidewall blowout flats on full carbon clinchers Originally posted by pschriver What I have seen in the 2 tires (the second almost brand new) is a dimple on the sidewall like a blister. Both were Continental 4000. I didn't think much about the first and thought it was road damage but the second was odd. It happened immediately after a 3 mile descent. I have heard the sidewall blowing out on Conti's and other tires that turn out to be a manufacturing defect. Also how old were they? How long did the store sit on them? Were they stored in a hot attic? Sat near a window with the sun on them all the time? Were the tires bought at the same time? All of these increase the possibility of failure. Buy some new tires and try again, if everything is good contact Continental and ask for some replacement tires. |
| 2015-10-26 12:14 PM in reply to: mike761 |
Master 2094 | Subject: RE: Sidewall blowout flats on full carbon clinchers Both of the flats were on the same wheel. Rear. The first tire was bought about 5 months ago but wasn't ridden much until recently. The second tire lasted less then a month. I have no idea how long they sat on the shelves prior to purchase. The bikes are stored in a climate controlled basement away from the sun. (Adjacent to the wine cellar) I actually swapped the wheels out for Cosmic Carbones and put on Gatorskins. I hope it doesn't sound like I'm bashing Conti tires. I have used them for years and have been happy. I am a little skeptical about carbon braking surfaces. I might send the tires back to Continental if they want to look at them and give an expert opinion but for now, the carbon wheels are going back on the wheel wall. |
| 2015-10-26 1:29 PM in reply to: pschriver |
Extreme Veteran 3025 Maryland | Subject: RE: Sidewall blowout flats on full carbon clinchers what tire pressure are you running |
| 2015-10-26 5:29 PM in reply to: dmiller5 |
Master 2094 | Subject: RE: Sidewall blowout flats on full carbon clinchers 90 PSI |
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