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How common is it to blow out a sidewall?(12 posts)

How common is it to blow out a sidewall?DINOSAUR
Mar 27, 2003 3:43 PM
I was descending about 25MPH, about 25 miles into my ride. I had just stopped a couple of minutes ealier to eat an energy bar so the rims were not hot. The sidewall of my Conti GP 4-Season blew (rear tire). It was not over-inflated (120 psi) I did not run over anything. The tire had about 1K on it and was about halfway worn. I can not remember the last time I blew out a sidewall. Defective tire? Or maybe I had run over something earlier not noticing and damaged the sidewall? I managed to boot the tire using 2 Park glueless patches and I made it home. I'm wondering if I should stick with these tires or go back to the Conti GP3000's. Anybody else had problems with the 4-Seasons? Or maybe just bad luck....
I had a Conti Gatorskin blow outDougSloan
Mar 27, 2003 4:07 PM
I posted pictures of it about 9 months ago. I was pumping it and it blew out where the sideway attaches to the wire bead. Of maybe a hundred or so tires I've gone through, it's just happened once.

Is it possible you pinched it somehow when installing on a tight rim?

I'd take it in for warranty.

I've blown Supersonics off the rims, but that's a different problem.

Doug
Either got cut or somehow defective - NOT common (nm)Kerry
Mar 27, 2003 4:47 PM
re: How common is it to blow out a sidewall?davet
Mar 27, 2003 6:05 PM
I have had all manners of Conti tires, 1000, 2000 Gp3000, Top Touring 2000, on all my bikes, ridden in all kinds of conditions. I've NEVER had a sidewall blowout.
Me neither...DINOSAUR
Mar 27, 2003 7:34 PM
No pinch flat as Doug mentioned. I think I had a flat in my garage with this tire after a ride a couple of hundred miles ago. My experience with pinch flats is that they happen very soon into the ride. I've also blown off tires in my garage because they were not seated correctly. I'm a big Conti fan. I have not had a sidewall blow out on me for about 28 years. I can't see any evidence on the outside of the tire that indicates that it was cut. I'm a real fruitcake about tires as I crashed due to a flat on my front rim rim 3 years ago. I inspect my tires after each ride. I'm guessing it was defective. Luckily the tire was on my rear rim when it blew. I really like the 4 Seasons, but now I'm a little leery......
Pinch flats.....russw19
Mar 27, 2003 10:51 PM
Pinch flats happen early in your ride because they are generally only caused by two things. Not getting the tube all the way into your tire causing the tube to be pinched between the tire bead and the rim itself (hence the term, pinch flat) or riding too low of pressure. If your tires are under inflated, the first time you hit a bump the tire bottoms out on the rim pinching the tube in between.

Anyways, just thought I would share that since you mentioned pinch flats in your post.

I have never blown a sidewall out for no reason. I have blown out a sidewall after I rubbed up against a curb in a Crit. It was a Conti and they gave me a new one even after I told them I rubbed the curb. I spent a dollar fixing the old one and made it a trainer tire. I booted it with a folded one dollar bill and taped it in place with some duct tape. Rode it all winter long on the trainer (which in Florida was a whole 3 weeks at the beginning of January.)

Russ
Maybe not tire, bad tube perhaps?DINOSAUR
Mar 28, 2003 7:14 AM
I threw the tire in the trash, maybe I'll haul it down to my LBS and see if they will replace it. My only thinking is that perhaps sometime prior to the tire blowing I hit something a couple of days ealier and the tire decided to blow at that time. I had been riding more than a couple of minutes after stopping to take a short break, now that I think of it, more like 4 or 5 miles with a lot of descending. These are great tires, just very unusual to blow a sidewall at 120 psi (I weigh 190) on a smooth section of road without running over anything.....the mystery continues...wonder if those cheap Blackburn made in China tubes had anything to do with it?.....
A few times with 20c tires.teamsloppy
Mar 27, 2003 9:12 PM
You didn't mention the tire size. I had at least three, maybe 4 or 5 sidewall blow outs when hitting a rock (or a bolt) that cut the sidewall, over 15 years. Mine were an instant blowout or that 'pss pss pss pss' leak as the tire spins(not the delayed thing you described. I think that the rock or bolt touched the rim and sidewall at the same time. Two of the times I had a dent in the rim on one side only (hence the rock contacting the rim theory). A 20c doesn't overhang the rim as much. Since swithcing to 23c I have never had this happen. In fact, the reason I have not gone back to 20c is the way 23c seems to bounce off rocks.

The 20c were of the Specialized Turbo family, 12 years worth, going back to 1985(?). I switched to Mich. Axial Pros in 23c 2 years ago and recently (1 year) switched to Vredestien Fortezza & Tricomp.
It was a 23c.....DINOSAUR
Mar 27, 2003 9:59 PM
It blew, no delay. I heard the explosion. It's not the sound you want to hear when you are descending. I did not run over anything, nice quite stretch of road, no road hazards. I just wondered if anyone else had this problem with the 4-Seasons, I like these tires, but not if this is a problem...they were doing great on mileage...
I think I found the problem, defective gauge on floor pump..DINOSAUR
Mar 28, 2003 9:38 AM
The gauge on my fairly new Specialized floor pump appears to be about 10 to 15 pounds off. When I was inflating to 120 psi on the guage I was acutaully inflating up to 130-135. So over inflation appears to be the culprit. You wouldn't think that 10 to 15 pounds over the max recommended psi would be enough to blow a sidewall, but I guess it was. So it might be a good idea to check the gauge on your floor pumps and see if they are accurate...
I think I found the problem, defective gauge on floor pump..koala
Mar 28, 2003 1:39 PM
What model is it? I have the yellow air force team and I hate it. If it was reading incorrectly i guess that would force me to get a new one... cool.
That's it...DINOSAUR
Mar 28, 2003 4:41 PM
A yellow Air Force Team. When I got up to a reading of 100 pounds I would have to use a lot of muscle to get up to 120 psi. I was wondering why the Conti's were so hard riding. I was probably close to blowing the tire off the rim. 1K on these tires and it's a wonder they didn't blow before. I was also having problems with the thumb lock valve head popping off the valve stem...it never occurred to me that the gauge might be off....