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Tire Failure
Recently had a sidewall failure on a Continental 700 x 28 Gatorskin tire.
Mounted once and only once on a Weiman Concave rim it blew at less than 350 miles. The sidewall suffered an inch and a quarter "cut" right next to the wire bead. The tire material surrounded the inside of the bead but the bead could be observed from the tire side. This was on the rear of our tandem. We are a big team 400+ pounds. Tire was allways inflated to 120 psi and topped off to 120 psi with a borrowed floor pump the previous day. Two days before we had done a 7% ten mile long descent. Stopped half way down and felt the rims. The front was only warm to the touch, could have continued finger contact indefinately. The rear did not feel warm at all. The failure was near the valve thus I had not used tire irons in the damaged area to mount the tire. When the tire failed we were coasting down a very smooth newly paved road. I am not aware of us hitting anything there or anywhere else that would have damaged the tire. Didn't fall but we often go MUCH faster so this incident is disconcerting. Was it the tire, the rim, the pressure, the heat? All insights will be appreciated. Thanks in advance, Bob |
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Tire Failure
AGRIBOB wrote:
Recently had a sidewall failure on a Continental 700 x 28 Gatorskin tire. Mounted once and only once on a Weiman Concave rim it blew at less than 350 miles. The sidewall suffered an inch and a quarter "cut" right next to the wire bead. The tire material surrounded the inside of the bead but the bead could be observed from the tire side. Check for worn brake pads contacting sidewall. If that sounds like a novice mistake, well, I've been there and done that (long after I should have known better). In my case, the pads, either initially or as they wore, reached slightly above the top of the rim. Wear then caused them to overhang the rim with a very thin (i.e. knife edge) shape, and two tires went quickly before I figured it out with much embarassment. Regards, Mark Janeba |
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Tire Failure
Check for worn brake pads contacting sidewall.
Thanks Mark, but that wasn't the case. Bob |
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Tire Failure
AGRIBOB wrote:
Recently had a sidewall failure on a Continental 700 x 28 Gatorskin tire. Mounted once and only once on a Weiman Concave rim it blew at less than 350 miles. The sidewall suffered an inch and a quarter "cut" right next to the wire bead. The tire material surrounded the inside of the bead but the bead could be observed from the tire side. -snip- The failure was near the valve thus I had not used tire irons in the damaged area to mount the tire. -snip- I was not there. But that is consistent with someone pulling the valve down snugly to the rim before airing the tire. The tire would have a lump at the valve, which would drag on a brake shoe, fatally. -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971 |
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Tire Failure
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Tire Failure
On Sun, 11 Jan 2004 21:40:14 -0600, A Muzi wrote:
AGRIBOB wrote: Recently had a sidewall failure on a Continental 700 x 28 Gatorskin tire. Mounted once and only once on a Weiman Concave rim it blew at less than 350 miles. The sidewall suffered an inch and a quarter "cut" right next to the wire bead. The tire material surrounded the inside of the bead but the bead could be observed from the tire side. -snip- The failure was near the valve thus I had not used tire irons in the damaged area to mount the tire. -snip- I was not there. But that is consistent with someone pulling the valve down snugly to the rim before airing the tire. The tire would have a lump at the valve, which would drag on a brake shoe, fatally. I wasn't there, either, but I was riding with a couple on a tandem who had a similar problem. I think their tire was a Continental 2000, again a 28mm width. Tire failed on the sidewall, very close to the bead. It had a 1cm long hole, but was frayed for a longer stretch. The captain is a very experienced cyclist. I checked the brake, and it was not even close to the edge. The failure was not at the valve, it was almost exactly opposite from the valve. The rim did not seem to have a rough edge there, and the tape was fine. Fortunately I had my spare tire with me, so they could get home. Personally, I've seen too many people with sidewall problems with Continental tires. -- David L. Johnson __o | Become MicroSoft-free forever. Ask me how. _`\(,_ | (_)/ (_) | |
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Tire Failure
agribob- Recently had a sidewall failure on a Continental 700 x 28 Gatorskin
tire. Mounted once and only once on a Weiman Concave rim it blew at less than 350 miles. BRBR Warranty-we have seen a few of these, BUT I think this tire is inappropriate for a 400 pound tandem. A Top Touring or equivalent is a better choice, IMO- Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302 (303)440-3535 http://www.vecchios.com "Ruote convenzionali costruite eccezionalmente bene" |
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Tire Failure
"AGRIBOB" wrote in message ... Recently had a sidewall failure on a Continental 700 x 28 Gatorskin tire. Mounted once and only once on a Weiman Concave rim it blew at less than 350 miles. The sidewall suffered an inch and a quarter "cut" right next to the wire bead. The tire material surrounded the inside of the bead but the bead could be observed from the tire side. This was on the rear of our tandem. We are a big team 400+ pounds. Tire was allways inflated to 120 psi and topped off to 120 psi with a borrowed floor pump the previous day. Two days before we had done a 7% ten mile long descent. Stopped half way down and felt the rims. The front was only warm to the touch, could have continued finger contact indefinately. The rear did not feel warm at all. The failure was near the valve thus I had not used tire irons in the damaged area to mount the tire. When the tire failed we were coasting down a very smooth newly paved road. I am not aware of us hitting anything there or anywhere else that would have damaged the tire. Didn't fall but we often go MUCH faster so this incident is disconcerting. Was it the tire, the rim, the pressure, the heat? All insights will be appreciated. Thanks in advance, Bob I'm just a middleweight roadie, but I do lots of miles and I started out doing them on contis. I had lots of sidewall blowouts. I just figured it was normal. Then I started experimenting with other tires. I've never had a sidewall blowout since. I think it's a flaw in the Conti design. That's just my opinion, but I've probably ridden 50,000 miles on other tires since I stopped riding contis and I've not had a single sidewall cut or blowout. I also got sick of those little threads peeling off the bead area with the contis. Sometimes I'd find them wrapped all up in my hubs. Don't know if they still have that aggravating problem. Bob C. |
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Tire Failure
snip
I'm just a middleweight roadie, but I do lots of miles and I started out doing them on contis. I had lots of sidewall blowouts. I just figured it was normal. Then I started experimenting with other tires. I've never had a sidewall blowout since. I think it's a flaw in the Conti design. snip Conti's a reasonably good tire, but I have had a large number of sidewall cuts on Gatorskins and I agree, the sidewall is the Conti's achille's heel (and don't buy 700x25 4-Season GP 3000's either - the tread lasts about 700 miles). App |
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Tire Failure
agribob-
Recently had a sidewall failure on a Continental 700 x 28 Gatorskin tire. Mounted once and only once on a Weiman Concave rim it blew at less than 350 miles. No one's mentioned it yet, and I'm not sure it's important, but isn't the Weinmann Concave one of those rims *without* hooks? |
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