Dura Ace C24 Wheels-help please!

Nick A

I have recently bought some DuraAce C 24 tubeless wheels. Light ,v responsive and seemed great.I bought them 3 weeks before a trip to the Dolomites so decided to ride them with tubes and normal tyres for the trip -to keep life simple as a long-10 days ,endurance type event. First 3 days were fine but then had a blow out -which blew the ( new) tyre off the rim and took the bead off the tyre. Wheels were not overheated as had just started descent.Front wheel and off I came as cornering at the time.

Two days later ,bang and this time rear wheel-again new tyre blown off rim and a large rip in tyre. This time the rear wheel so managed to stay on even tho doing over 60kmh.
Then 3 hours later,bang and it was the front wheel again but this time I was going up a hill and doing about 10kmh.
Each time bead blown off the tyre -( new Conti 4000 GPS ) and hole in the tube ( new Conti tubes ) at least 6 inches long.

It was not the brake blocks rubbing.I weigh less than 11 stones and pressure 95-100lbs.

Wheels now back with Madison but has anyone else heard of anything similar or have any ideas at all please while I am waiting for Madison to come back to me ?
any thoughts gratefully received.
thanks.

Mike39496

Nick A wrote:

I have recently bought some DuraAce C 24 tubeless wheels. Light ,v responsive and seemed great.I bought them 3 weeks before a trip to the Dolomites so decided to ride them with tubes and normal tyres for the trip -to keep life simple as a long-10 days ,endurance type event. First 3 days were fine but then had a blow out -which blew the ( new) tyre off the rim and took the bead off the tyre. Wheels were not overheated as had just started descent.Front wheel and off I came as cornering at the time.

Two days later ,bang and this time rear wheel-again new tyre blown off rim and a large rip in tyre. This time the rear wheel so managed to stay on even tho doing over 60kmh.
Then 3 hours later,bang and it was the front wheel again but this time I was going up a hill and doing about 10kmh.
Each time bead blown off the tyre -( new Conti 4000 GPS ) and hole in the tube ( new Conti tubes ) at least 6 inches long.

It was not the brake blocks rubbing.I weigh less than 11 stones and pressure 95-100lbs.

Wheels now back with Madison but has anyone else heard of anything similar or have any ideas at all please while I am waiting for Madison to come back to me ?
any thoughts gratefully received.
thanks.

Shouldn't you be using tubs? :?

styxd

Try some different tyres? Those the bead is quite loose on those tyres I find.

styxd

Mike39496 wrote:

Nick A wrote:

I have recently bought some DuraAce C 24 tubeless wheels. Light ,v responsive and seemed great.I bought them 3 weeks before a trip to the Dolomites so decided to ride them with tubes and normal tyres for the trip -to keep life simple as a long-10 days ,endurance type event. First 3 days were fine but then had a blow out -which blew the ( new) tyre off the rim and took the bead off the tyre. Wheels were not overheated as had just started descent.Front wheel and off I came as cornering at the time.

Two days later ,bang and this time rear wheel-again new tyre blown off rim and a large rip in tyre. This time the rear wheel so managed to stay on even tho doing over 60kmh.
Then 3 hours later,bang and it was the front wheel again but this time I was going up a hill and doing about 10kmh.
Each time bead blown off the tyre -( new Conti 4000 GPS ) and hole in the tube ( new Conti tubes ) at least 6 inches long.

It was not the brake blocks rubbing.I weigh less than 11 stones and pressure 95-100lbs.

Wheels now back with Madison but has anyone else heard of anything similar or have any ideas at all please while I am waiting for Madison to come back to me ?
any thoughts gratefully received.
thanks.

Shouldn't you be using tubs? :?

Yes, tubeless, not TUBULAR!!!

Mike39496

styxd wrote:

Mike39496 wrote:

Nick A wrote:

I have recently bought some DuraAce C 24 tubeless wheels. Light ,v responsive and seemed great.I bought them 3 weeks before a trip to the Dolomites so decided to ride them with tubes and normal tyres for the trip -to keep life simple as a long-10 days ,endurance type event. First 3 days were fine but then had a blow out -which blew the ( new) tyre off the rim and took the bead off the tyre. Wheels were not overheated as had just started descent.Front wheel and off I came as cornering at the time.

Two days later ,bang and this time rear wheel-again new tyre blown off rim and a large rip in tyre. This time the rear wheel so managed to stay on even tho doing over 60kmh.
Then 3 hours later,bang and it was the front wheel again but this time I was going up a hill and doing about 10kmh.
Each time bead blown off the tyre -( new Conti 4000 GPS ) and hole in the tube ( new Conti tubes ) at least 6 inches long.

It was not the brake blocks rubbing.I weigh less than 11 stones and pressure 95-100lbs.

Wheels now back with Madison but has anyone else heard of anything similar or have any ideas at all please while I am waiting for Madison to come back to me ?
any thoughts gratefully received.
thanks.

Shouldn't you be using tubs? :?

Yes, tubeless, not TUBULAR!!!

My apologies, he needs a tubeless tyre though (not tub) does he not? Reading up on these a bit more I get the impression you don't need an inner-tube but that kevlar beads aren't strong enough to hold the tyre in.

styxd

No he doesnt need a tubeless tyre. Although it could/would have possibly prevented this problem. Tubeless tyres have stronger beads to help them seal the air in, rather than to stop them popping off the rim.

I use tubeless rims with Conti 4000s tyres and dont have any problems.

Nick A

thanks styxd.All was fitted by a v good mechanic as part of service before I left on trip . If you have used this combination without problems that is good to know but I have no faith at all in riding them with tubes -the road rash has only just healed up a month later.........

styxd

Nick A wrote:

thanks styxd.All was fitted by a v good mechanic as part of service before I left on trip . If you have used this combination without problems that is good to know but I have no faith at all in riding them with tubes -the road rash has only just healed up a month later.........

I have not used THAT specific combination, but I have used tubeless rims and those conti tyres with no problems.

I've found tyres are normally a bit tighter to fit on tubeless rims, so if anything, those tyres could have done the same on any other none tubeless rim (Mavic open pro for example)

I am not familiar with the C24's specifically though.

But they are popular wheels, and those are popular tyres, so I would have thought this issue would/could have been noted by others before this. Have a search on google.

I reckon it was a problem with the tyres? A bad batch perhaps? Or maybe they were stored next to a radiator or summat. I dunno, this is pure guess work.

Also, check the inside of where the tyre sits in the rim, any sharp edges or anything like that?

Nick A

thanks and really cannot see anything at all.
replies appreciated and will update on what Madison say-who distribute Shimano AND Conti!

Monty Dog

I'm not sure from the description whether the OP was running the tyres tubeless? If this is the case, then regular tyre beads aren't simply strong enough to be run tubeless at high pressures and could be the problem.
The times I've seen that sudden blow-outs damage the tyre is due to incorrect installation i.e. pinched tubes - there's a lot of energy in an inflated tyre and a rapid and sudden release of compression can easily damage the tyre.
It may simply be down to incompatibility of that particular rim and tyre combo?

styxd

Yes, if you were running them tubeless with those Conti tyres then Im not surprised you encountered problems.

racingcondor

Nick A wrote:

with tubes and normal tyres

Looks like the OP was just running them as you would a normal wheel. They should be fine like this and as somoone has said both wheels and tyres are popular so it's not a common problem or we would have heard about it.

I'm afraid I don't have any suggestions but I hope you get it sorted to your satisfaction, it sounds like a painful experience so far...

ian20079

Hi. I have just got a pair of these (clinchers) and put my existing tyres (Conti GP) on the wheels. I pumped them up and the inner tube blew. The only thing I can think of is that the tyres beads are loose due to wear and maybe a new set of tyres on the new wheels in the only option. I'm not that tech minded so any help is appreciated.

sloppyschleckonds

Monty Dog wrote:

The times I've seen that sudden blow-outs damage the tyre is due to incorrect installation i.e. pinched tubes - there's a lot of energy in an inflated tyre and a rapid and sudden release of compression can easily damage the tyre.

Sounds like pinched tubes

nferrar

Yeah, might be a stretched bead but more likely the tube got pinched when you fitted them, also if you use a valve lock nut don't wind it in until the tyre is pumped up as if you screw it down tight it stops the tyre bead sitting properly around the valve area.

964cup

Pressure sounds low, too. I run 125psi front and rear; I was speaking to a Schwalbe rep at the Pru cycle show recently and he suggested that 120psi was the lowest acceptable pressure for "race" tyres. We were talking about the Ultremo ZXs I'm using (also on DA C24s) but I expect it would apply to other tyres also.