was trying to get my first september ride in this afternoon around 5pm. i had just hopped on power line trail at hawes and was headed north. while climbing out of a wash i hear this sharp bang,, like when you make the popping noise with your finger in your cheek,, except 100x louder... i look down and i'm riding on my rear rim. the tire blew clear off the rim and was wrapped around my crank. luckily being only a few feet away from power road i could just walk the bike over to the shoulder to take a look. if this happened well into the trail i'd have been out there after dark
this was a brand new specialized captain tire purchased AND installed by DNA cycles only a few weeks ago (on a stans flow wheel i bought last october but only started using last month). this was to be my 4th ride with this rear wheel and tire... there was no damage whatsoever to the sidewall. even after using a rag to wipe all the dirt off the rim and tire, i couldnt get the tire seated again with a hand pump, and since i only lived less than a mile away, pulling out the stans factory rimstrip to throw in a tube would have just caused more work later. so i started walking back home. blind luck a pick up truck stopped a minute into my walk and offered my a lift back home.
i know i had that rear pumped up to about 28psi right before i left. maybe that was too low? or did i just happen to hit something just right that caused it to blow like that? Ive burped tubeless before last summer, but never anything so damn loud as this. plus the tire is usually still ON your wheel after a burp.
i could still wiggle the tire a bit with my hand. 28 is too high? (this was a floor pump,, not a compressor reading, although i did buy one a few weeks ago when i redid my front) i know i've gone higher than that before.
Carefully inspect the beads. What I have seen happen on more than one
Occasion is the bead get damaged during installation due to improper use of drop center (along with excess force). It is difficult to detect but sure can happen when the bead has yielded to the hands of an over eager tire installer.
This sounds impossible but I have encountered it on a dirt bike tire as well (twice in fact).
In my experience, the specialized tires seem to be very uniform and repeatably sized unlike
Some of the cheapo tires.
I'm running the same rear setup right now I think. Is that a flow rim and a captain control 2.2?
the tire was really easy to get back on the rim with just my hands (i just couldnt reseat it with the hand pump). I cant imagine they needed any excessive force at the shop when they first set it up that might have damaged it.
Scary! 28psi is normal pressure, maybe a bad gauge. If not, there's gotta be a good reason why that happened. Clean up the tire, mount it with a tube, and look over everything. That's really not supposed to happen!
The problem is the tire fits too loose on the rim. Usually specys fit tighter than that. Mounts easy, blew off the rim, sounds like the tire is at fault. Your pressure is fine. Tubless set-up likes a snug fit. Best-o-luck
I had something similar happen to me too. All in about four seconds, a broken spoke punctured the rim tape, and I'm guessing the speed I was going and the pressure in the tire, caused it to "blow" off the rim. Yep, I took a Stan's bath too...good times
Spesh has a 90 day no questions asked return policy. Return the tire & get a new one so there are no questions wether or not the bead is good. Install the new tire yourself.
Since the tire blew off the rim, it is toast, and it's bead should not be trusted.
Have had a few burps, but luckily no blow-offs. PSI should've been fine, @ 210# run mine around 24(f) / 28(r).
Something similar happened to me at Keystone. I slid sideways when the rear tire went around the outside of the berm & the front went inside. When I got to that sideways angle the front tire went BANG and threw me off the high side. A few spectators/hikers commented on how load it was too. No injury but like you I had sealant all over and had to walk down the rest of the run.
I captured it on video for those interested. The incident doesn't occur until around 4:15 but feel free to enjoy the whole thing.
i couldnt get the tire seated again with a hand pump, and since i only lived less than a mile away, pulling out the stans factory rimstrip to throw in a tube would have just caused more work later. so i started walking back home.
You do not have to remove the stans rimstrip to put in a tube. Just removed the valve.