Rather worrying thing today

[Dec66]

Riding to work this morning, and about three miles in started to feel an ever so slight "nudge in the rear" from the back wheel, the one that goes "duf-duf-duf-duf-duf-duf-duf-duf-duf-duf" (ad nauseum) and makes you think you're punctured.

Stopped and checked the pressure; seemed OK to the finger pinch. Spun the wheel to see if it was buckled... Nope.

Carried on, got to work (another 10 and a bit miles) duf-duf-duffing along almost imperceptibly.

Went to leave this evening, pulled the bike from the rack, went to spin the back wheel and noticed half the tyre was off the rim. Pulled the tube out, thinking there was a puncture, tried to blow it up a bit to determine where the hiss would be... Wouldn't blow up.

Just as I was cursing the quality of my hand pump, I spotted a two and a half inch long rip in the tube.

My mind started playing tricks on me then, wondering what had happened, and wondering if it was going to happen again, possibly whilst going downhill at a lick with a van behind me.

Anyway, I replaced the tube and tyre, blew it up, rode home carefully, but couldn't feel any more duf-duf-duffing.

I'm still mystified though: all I can think is that somehow the tube got a bulge in it, which eventually ruptured while the bike was parked up and blew the tyre of the rim. But what would cause it to suddenly do something like that? The tube's been in place for as long as I can remember.

Any thoughts?

 

[Gatters]

Any thoughts?

Think I'll make the most of the nice weather and go for a ride tomorrow afternoon

 

[Tim Hall]

The tyre will have come off the rim (hence the duf duf duf ) allowing the tube to escape. Unconstrained by the tyre, the tube exploded like a excitable balloon.

What didn't happen was the tube exploding and blowing the tyre off the rim.

Presumably the tyre became partly unseated on your ride in, then finished the job while you were sat at your desk. If it had happened while you were riding, you would have heard the tube explode.

 

[gbb]

Perhaps the tyre has been slightly mis-mounted a long time ago and has been imperceptibly moving, ultimately coming loose from the rim. You'd perhaps not have realised it until it could hold no more and came off...perhaps.

Have you inspected the tyre REALLY closely...ive had the wire bead start to seperate from the tyre before...usually you see some cracking near the bead and perhaps even a rust coloured stain where the bead has become exposed. The tyre could have just been holding together...and may go again. Id inspect it VERY closely, just to satisfy myself.

 

[Gatters]

op replaced the tyre

 

[ColinJ]

The tyre will have come off the rim (hence the duf duf duf ) allowing the tube to escape. Unconstrained by the tyre, the tube exploded like a excitable balloon.

What didn't happen was the tube exploding and blowing the tyre off the rim.

Presumably the tyre became partly unseated on your ride in, then finished the job while you were sat at your desk. If it had happened while you were riding, you would have heard the tube explode.

I had exactly that on my mountain bike once. I got the duf-duf-duf ... noise from my rear wheel on a technical descent where it would have been awkward to stop so I rode to the bottom and then dismounted to see what was going on. What was going on was as described above ... the tube was bulging out between the rim and the tyre. I watched in horrified fascination as the bulge got bigger and bigger, and then the tube exploded with a BANG!!! that almost deafened me!

 

[Dec66]

I'd thought that maybe the tyre had freed itself, but I'd sort of discounted that as (1) I went another 10 and a bit miles with no big bang and (2) the "duf-duf-duf" was barely noticeable (I'd have expected more of a kick).

Still, you're probably right. The tyres, incidentally, are Vittoria Rubino Pro's (folding sort, not the rigid wire bead).

 

[Dec66]

Think I'll make the most of the nice weather and go for a ride tomorrow afternoon

I'll have one in the morning AND one in the afternoon. So there. **










** through South London's worst traffic

 

[Yellow Saddle]

The tyre will have come off the rim (hence the duf duf duf ) allowing the tube to escape. Unconstrained by the tyre, the tube exploded like a excitable balloon.

What didn't happen was the tube exploding and blowing the tyre off the rim.

Presumably the tyre became partly unseated on your ride in, then finished the job while you were sat at your desk. If it had happened while you were riding, you would have heard the tube explode.

I hope you get better treatment for that explanation than I did.

https://www.cyclechat.net/threads/problem.187989/post-3919006

 

[Yellow Saddle]

I'd thought that maybe the tyre had freed itself, but I'd sort of discounted that as (1) I went another 10 and a bit miles with no big bang and (2) the "duf-duf-duf" was barely noticeable (I'd have expected more of a kick).

Still, you're probably right. The tyres, incidentally, are Vittoria Rubino Pro's (folding sort, not the rigid wire bead).

The tyre bead is faulty. Although you can cut the bead in many places and it will still hold the tyre under pressure, if it's shape is wrong, it will not hook behind the ridge in the rim. Something goes wrong with it's profile and it slides over instead of hooks into the rim.

 

[Dec66]

The tyre bead is faulty. Although you can cut the bead in many places and it will still hold the tyre under pressure, if it's shape is wrong, it will not hook behind the ridge in the rim. Something goes wrong with it's profile and it slides over instead of hooks into the rim.

OK ta, I'll keep an eye on the shape before setting off (and get off if I feel a "duf-duf-duf"). I may put the Conti Ultra Sports from my Cube on it, but they're not ideal for commutes, having the puncture resistance of wet tissues.

 

[Gatters]

I'll have one in the morning AND one in the afternoon. So there. **










** through South London's worst traffic

Duff Duff...Boom boom

 

[growingvegetables]

My mind started playing tricks on me then, wondering what had happened, and wondering if it was going to happen again, possibly whilst going downhill at a lick with a van behind me.

Can there be worse?

Yup.

Similar experience - except that I'd got home. Was just getting into bed, snuggling in under the duvet, getting comfortable .................... and the rear tube went BANG, followed by an eerie whistling.



I thought somebody had put a firework through the letter-box.

 

[Ajax Bay]

Was just getting into bed, snuggling in under the duvet, getting comfortable .................... and the rear tube went BANG, followed by an eerie whistling.

@Fnaar alert

 

[Dec66]

Took a longer route to work today, having properly inflated to 100PSI...

"duf-duf-duf" count = 0.

Still going at a slower rate of knots than I normally would, just to be on the safe side, but I think we're OK.

Cheers, all.