I was taking a tight right turn and my rear clincher rolled right off the rim. I am using Cane Creek Aerohead wheels, and have noticed that mounting tires on the velocity rims is a lot easier than with any other rim I've ever used. Has anyone else had similar experiences with rims on which it is too easy to mount tires on?
Note: during the turn I was holding the bike more upright than usual as I was trying to pedal. Tire is a Specialized Comp Turbo 700x26c. Tire pressure was around 110psi.
I was taking a tight right turn and my rear clincher rolled right off the rim. I am using Cane Creek Aerohead wheels, and have noticed that mounting tires on the velocity rims is a lot easier than with any other rim I've ever used. Has anyone else had similar experiences with rims on which it is too easy to mount tires on?
Note: during the turn I was holding the bike more upright than usual as I was trying to pedal. Tire is a Specialized Comp Turbo 700x26c. Tire pressure was around 110psi.
I'm guessing that you lost tire pressure as you were about to enter the turn. I've never heard of clinchers rolling off a rim when fully inflated.
Spacey Spade at [email hidden] wrote on 7/23/03 4:00 PM:
Quoted message said:
I was taking a tight right turn and my rear clincher rolled right off the rim. I am using Cane Creek Aerohead wheels, and have noticed that mounting tires on the velocity rims is a lot easier than with any other rim I've ever used. Has anyone else had similar experiences with rims on which it is too easy to mount tires on?
Note: during the turn I was holding the bike more upright than usual as I was trying to pedal. Tire is a Specialized Comp Turbo 700x26c. Tire pressure was around 110psi.
I've found Specialized tires generally to have very loose-fitting beads, but have never managed to actually roll one that was properly inflated.
You'd need pretty high speeds and a pretty decent sideways force from the roadway - tough to do that unless you were fishtailing. Are you sure you didn't nick it or pinch it on something first?
I was taking a tight right turn and my rear clincher rolled right off the rim. I am using Cane Creek Aerohead wheels, and have noticed that mounting tires on the velocity rims is a lot easier than with any other rim I've ever used. Has anyone else had similar experiences with rims on which it is too easy to mount tires on?
Note: during the turn I was holding the bike more upright than usual as I was trying to pedal. Tire is a Specialized Comp Turbo 700x26c. Tire pressure was around 110psi.
As Kenny Lee mentioned, I would suspect you may have already lost air pressure in that tire before it came off the rim. If the tire did indeed have 110psi, the resultant explosion when the tube exited the tire would have been VERY loud (and left a huge, ragged hole in the tube). If both of these things didn't happen, you have your answer.
That said, I DID have a Specialized Armadillo blow off at rated pressure once when warming up on my tandem for the state TT championship. The bad news is the tube was a slime tube, and it threw slime everywhere. The good news is that it was the rear tire, and I was in the captain's position so the stoker stopped all the slime before it got to me!
Spacey Spade at [email hidden] wrote on 7/23/03 4:00 PM:
Quoted message said:
I was taking a tight right turn and my rear clincher rolled right off the rim. I am using Cane Creek Aerohead wheels, and have noticed that mounting tires on the velocity rims is a lot easier than with any other rim I've ever used. Has anyone else had similar experiences with rims on which it is too easy to mount tires on?
Note: during the turn I was holding the bike more upright than usual as I was trying to pedal. Tire is a Specialized Comp Turbo 700x26c. Tire pressure was around 110psi.
I've found Specialized tires generally to have very loose-fitting beads, but have never managed to actually roll one that was properly inflated.
You'd need pretty high speeds and a pretty decent sideways force from the roadway - tough to do that unless you were fishtailing. Are you sure you didn't nick it or pinch it on something first?
-- Jim
The tube didn't have any other hole besides the monster rip from the explosion. I was leaning in like on a motorcycle so I could pedal, and I did with some force... plus I had cornered all the way from the inside to the outside, and on the outside where the rolloff occured the lean angle compared to the street was even greater because the street slopes quite a bit from either side to the middle. I didn't do any skiing until after the blowout. This was my first time to take this graveyard course. I'm thinking of holding a Crit there... if this happens again I'll have an open grave for the fall so we can be more efficient. Spacey
I was taking a tight right turn and my rear clincher rolled right off the rim. I am using Cane Creek Aerohead wheels, and have noticed that mounting tires on the velocity rims is a lot easier than with any other rim I've ever used. Has anyone else had similar experiences with rims on which it is too easy to mount tires on?
Note: during the turn I was holding the bike more upright than usual as I was trying to pedal. Tire is a Specialized Comp Turbo 700x26c. Tire pressure was around 110psi.
As Kenny Lee mentioned, I would suspect you may have already lost air pressure in that tire before it came off the rim. If the tire did indeed have 110psi, the resultant explosion when the tube exited the tire would have been VERY loud (and left a huge, ragged hole in the tube). If both of these things didn't happen, you have your answer.
I thought it was pretty loud. I've had tubes explode before and it was about the same. The tube had a 3 to 4 inch tear.
Quoted message said:
That said, I DID have a Specialized Armadillo blow off at rated pressure once when warming up on my tandem for the state TT championship. The bad news is the tube was a slime tube, and it threw slime everywhere. The good news is that it was the rear tire, and I was in the captain's position so the stoker stopped all the slime before it got to me!
I was taking a tight right turn and my rear clincher rolled right off the rim. I am using Cane Creek Aerohead wheels, and have noticed that mounting tires on the velocity rims is a lot easier than with any other rim I've ever used. Has anyone else had similar experiences with rims on which it is too easy to mount tires on?
Note: during the turn I was holding the bike more upright than usual as I was trying to pedal. Tire is a Specialized Comp Turbo 700x26c. Tire pressure was around 110psi.
I'm guessing that you lost tire pressure as you were about to enter the turn. I've never heard of clinchers rolling off a rim when fully inflated.
Kenny Lee
I hope you are right cause I don't want to be afraid of this course! Spacey
"Tom Paterson" <[email hidden]> wrote in message "]news:[email hidden]...
Quoted message said:
Quoted message said:
From: "Gearóid Ó Laoi, Garry Lee"
Quoted message said:
I've had one or two blow off due to heat, coming down really steep
hills in
Quoted message said:
Quoted message said:
the summer.
What pressure were you running on these?
And are you sure that they were properly seated? It certainly is possible to blow a tire off the rim, but, IMO, not at the rated pressure. -- Jay Beattie.
And are you sure that they were properly seated? It certainly is possible to blow a tire off the rim, but, IMO, not at the rated pressure. -- Jay Beattie.
So you're saying you weren't riding upright in relation to your bike? If you stay upright in a turn, all the centrifugal forces will be directed vertically (in relation to the frame) onto the wheel, but if you are skewing yourself sideways in the bike, you have introduced a side-force onto the tire.
"Spacey Spade" <[email hidden]> wrote in message "]news:[email hidden]...
Quoted message said:
The tube didn't have any other hole besides the monster rip from the explosion. I was leaning in like on a motorcycle so I could pedal, and I did with some force... plus I had cornered all the way from the inside to the outside, and on the outside where the rolloff occured the lean angle compared to the street was even greater because the street slopes quite a bit from either side to the middle. I didn't do any skiing until after
the
Quoted message said:
blowout. This was my first time to take this graveyard course. I'm thinking of holding a Crit there... if this happens again I'll have an
open
Quoted message said:
grave for the fall so we can be more efficient. Spacey
I've found Specialized tires generally to have very loose-fitting beads, but have never managed to actually roll one that was properly inflated.
You'd need pretty high speeds and a pretty decent sideways force from the roadway - tough to do that unless you were fishtailing. Are you sure you didn't nick it or pinch it on something first?
-- Jim
The tube didn't have any other hole besides the monster rip from the explosion. I was leaning in like on a motorcycle so I could pedal, and I did with some force... plus I had cornered all the way from the inside to the outside, and on the outside where the rolloff occured the lean angle compared to the street was even greater because the street slopes quite a bit from either side to the middle. I didn't do any skiing until after the blowout. This was my first time to take this graveyard course. I'm thinking of holding a Crit there... if this happens again I'll have an open grave for the fall so we can be more efficient. Spacey
I once rode (briefly) a tyre/rim combination that was so poor that the tyre kept on pulling away from the rim. I noticed the lump in the wheel and managed to stop and deflate the tube before it popped, but a section of the tube was quite clearly exposed and would presumably have popped had it been thinner/higher pressure. This happened a couple of times, I ended up riding home slowly at about 40psi and never used that combination again (mainly the rims to blame that time, I believe). I don't think I needed to corner hard to generate the problem but it seems likely that it would make the tyre more likely to disengage.
"Sergio SERVADIO" <[email hidden]> wrote in message "]news:[email hidden]...
Quoted message said:
Jay Beattie said:
Quoted message said:
What pressure were you running on these?
And are you sure that they were properly seated? It certainly is possible to blow a tire off the rim, but, IMO, not at the rated pressure. -- Jay Beattie.
Yes it is. Yes it is. Yes it is.
So, why would it blow off if it is not over-inflated, or if there is not a gross mismatch between rim and tire? The only time I have blown-off a clincher at the rated pressure is when it was way too big or when I did not get it seated properly. Unlike the OP, I have always found Turbos to be tight (too tight in the old days), at least on my Mavic rims. I have been using them since 1978 on and off, and never blew one off the rim -- even the wandering-tread factory seconds I bought from my buddies working in the Specialized warehouse.
"Sergio SERVADIO" <[email hidden]> wrote in message "]news:[email hidden]...
Quoted message said:
Jay Beattie said:
> What pressure were you running on these? And are you sure that they were properly seated? It certainly is possible to blow a tire off the rim, but, IMO, not at the rated pressure. -- Jay Beattie.
Yes it is. Yes it is. Yes it is.
So, why would it blow off if it is not over-inflated, or if there is not a gross mismatch between rim and tire? The only time I have blown-off a clincher at the rated pressure is when it was way too big or when I did not get it seated properly. Unlike the OP, I have always found Turbos to be tight (too tight in the old days), at least on my Mavic rims. I have been using them since 1978 on and off, and never blew one off the rim -- even the wandering-tread factory seconds I bought from my buddies working in the Specialized warehouse.
Happened to me with an Armadillo. It just didn't seem to "seat" when it was installed (though it was certainly centered and checked for tube intrusion between the rim and bead). I spoke with others who have had the same problem with them - blowing off at rated pressure.
Normally tires won't do that - but there are exceptions.
"James Annan" <[email hidden]> wrote in message "]news:[email hidden]...
Quoted message said:
Jay Beattie said:
So, why would it blow off if it is not over-inflated, or if there is
not
Quoted message said:
Quoted message said:
a gross mismatch between rim and tire?
How do you judge 'gross mismatch' other than with hindsight?
Rattles around like a hula hoop on a skinny kid. If it is within the range of ordinary tightness (meaning that some effort has to be exerted with your thumbs to get the tire on the rim), then there must be something more subtle causing the blow off. I am curious to find out what that is. -- Jay Beattie.
So you're saying you weren't riding upright in relation to your bike? If you stay upright in a turn, all the centrifugal forces will be directed vertically (in relation to the frame) onto the wheel, but if you are skewing yourself sideways in the bike, you have introduced a side-force onto the tire.
Right. Otherwise I would have been hitting the pedals on the road. I'm going to go back on the course tomorrow, though with a bit of hesitation on the gas pedal off the turns. I'm going to air up my tire to max, as I think this makes the tire stiffer to side loads.
