Schwalbe Ultremo blowing off rim
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Schwalbe Ultremo blowing off rim
Postby Comedian » Sun Nov 27, 2011 10:12 pm
Second time I try 130... this time I didn't even get upstairs before KABOOM! Same result.
I don't normally have trouble with tyres. Anyone got any ideas?
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Re: Schwalbe Ultremo blowing off rim
Postby Nobody » Sun Nov 27, 2011 10:21 pm
Why do you need to run 140 psi?
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Re: Schwalbe Ultremo blowing off rim
Postby il padrone » Sun Nov 27, 2011 10:38 pm
+1Nobody wrote:Why do you need to run 140 psi?
More to the point, why do you need 140psi when it's sitting inside ?? Going by Sheldon's tyre pressure advice 130psi would be suited to a 100kg rider on 20mm tyres. Is that you?
More information including a 15% tyre drop chart at Bike Quarterly.
"An unjustified and unethical imposition on a healthy activity."
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Schwalbe Ultremo blowing off rim
Postby Redbull » Sun Nov 27, 2011 10:42 pm
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Re: Schwalbe Ultremo blowing off rim
Postby open roader » Sun Nov 27, 2011 10:51 pm
The only other logical thing I can come up with (assuming the wheel rim is not dinged) is if there is a minor manufacturing fault in the bead of the offending tyre making the tyre not able to clinch under the rim lip for a partial section of the rim......... maybe hard to pick up visually on a folding tyre like these.......
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Re: Schwalbe Ultremo blowing off rim
Postby Comedian » Mon Nov 28, 2011 7:23 am
Well with clothes, shoes, and stuff packed into the jersey pockets let's say I'm 80kg. With spares and a couple of water bottles lets say the bike is 10kg. According to the write up you linked that's 55kg on the back. That's pretty much 130 psi.il padrone wrote:+1Nobody wrote:Why do you need to run 140 psi?
More to the point, why do you need 140psi when it's sitting inside ?? Going by Sheldon's tyre pressure advice 130psi would be suited to a 100kg rider on 20mm tyres. Is that you?
More information including a 15% tyre drop chart at Bike Quarterly.
This tyre was a bit of an experiment. I've been running continental Force on the back. They roll **really** well but are worn out in less than 2000k. So, I thought I'd go for this schwalbe which is significantly heavier but should be more durable. I was hoping to up the pressure a bit to keep the resistance down. I'm now very concerned about the tyre.
I'll put another tube in it and try 120 psi this afternoon. Yes, I put 15 psi ish in it and rocked it on the bead to check the seating. Thing is I need to have confidence in the tyre.
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Re: Schwalbe Ultremo blowing off rim
Postby martin_12 » Mon Nov 28, 2011 10:38 am
When you inflate the tyre, first inflate to about 20 psi and spin the wheel. If you watch the rim and tyre walls while the wheel spins you will see if it is properly seated or not.
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Re: Schwalbe Ultremo blowing off rim
Postby biker jk » Mon Nov 28, 2011 12:19 pm
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Re: Schwalbe Ultremo blowing off rim
Postby sogood » Mon Nov 28, 2011 12:46 pm
RK wrote:And that is Wikipedia - I can write my own definition.
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Re: Schwalbe Ultremo blowing off rim
Postby jacks1071 » Mon Nov 28, 2011 12:51 pm
Sounds like a fault in the tyre but that being said you've pumped it up way too hard. 120psi is really the absolute most you should run in a clincher.Comedian wrote:I've got a new Schwalbe Ultremo DD to fit to my Mavic Kysrium Elites. So far tonight I've fitted the thing by hand twice. First time I pumped it up to 140 (max is 145) ... came up stairs... BOOM. I go down and it's popped off the rim.
Second time I try 130... this time I didn't even get upstairs before KABOOM! Same result.
I don't normally have trouble with tyres. Anyone got any ideas?
For most clincher rims 120psi is the max recommended by the rim manufacturers.
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Schwalbe Ultremo blowing off rim
Postby Comedian » Mon Nov 28, 2011 2:31 pm
it says 84-145 stamped on the tyre!jacks1071 wrote:Sounds like a fault in the tyre but that being said you've pumped it up way too hard. 120psi is really the absolute most you should run in a clincher.Comedian wrote:I've got a new Schwalbe Ultremo DD to fit to my Mavic Kysrium Elites. So far tonight I've fitted the thing by hand twice. First time I pumped it up to 140 (max is 145) ... came up stairs... BOOM. I go down and it's popped off the rim.
Second time I try 130... this time I didn't even get upstairs before KABOOM! Same result.
I don't normally have trouble with tyres. Anyone got any ideas?
For most clincher rims 120psi is the max recommended by the rim manufacturers.
Mavic say 138 is their recommended max.
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Re: Schwalbe Ultremo blowing off rim
Postby Redbull » Mon Nov 28, 2011 4:03 pm
Yep and I run my rear at 120psi - but I have more than a couple of kilos over the rest of youComedian wrote:it says 84-145 stamped on the tyre!jacks1071 wrote:Sounds like a fault in the tyre but that being said you've pumped it up way too hard. 120psi is really the absolute most you should run in a clincher.Comedian wrote:I've got a new Schwalbe Ultremo DD to fit to my Mavic Kysrium Elites. So far tonight I've fitted the thing by hand twice. First time I pumped it up to 140 (max is 145) ... came up stairs... BOOM. I go down and it's popped off the rim.
Second time I try 130... this time I didn't even get upstairs before KABOOM! Same result.
I don't normally have trouble with tyres. Anyone got any ideas?
For most clincher rims 120psi is the max recommended by the rim manufacturers.
Mavic say 138 is their recommended max.
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Re: Schwalbe Ultremo blowing off rim
Postby heanous » Mon Nov 28, 2011 4:55 pm
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Re: Schwalbe Ultremo blowing off rim
Postby MichaelB » Tue Nov 29, 2011 3:39 pm
Schwalbe Ultremo ZX blow-up today
Mind you, the pressure you mention is way high imho. Even with 23c's, I have never gone over 110psi (and I was up to 98kg at the time). And now, I run 95/100 with the Conti Grand Prix in 24C and now being 88kg
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Re: Schwalbe Ultremo blowing off rim
Postby Comedian » Tue Nov 29, 2011 4:40 pm
See my post above. I'm lighter than you, but according to the info in the bicycle quarterly that SB refers to I need to be running about 130 in the rear to have an optimum pressure.MichaelB wrote:Seems you are not alone ....
Schwalbe Ultremo ZX blow-up today
Mind you, the pressure you mention is way high imho. Even with 23c's, I have never gone over 110psi (and I was up to 98kg at the time). And now, I run 95/100 with the Conti Grand Prix in 24C and now being 88kg
We re-fitted it last night and ran it at 120 today. It hasn't gone KABOOM yet. We also used a continental race tube rather than a race light.
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Re: Schwalbe Ultremo blowing off rim
Postby Clydesdale Scot » Tue Nov 29, 2011 9:08 pm
*subject to the frame being able to accommodate the wider tyre.
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Re: Schwalbe Ultremo blowing off rim
Postby Comedian » Tue Nov 29, 2011 10:23 pm
The bike came with 700x25 but they didn't roll anywhere near as well as the Continental Force and Attack that I replaced them with.Clydesdale Scot wrote:if you continue to have issues then you could try a wider tyre*, thus achieving the 15% tyre drop at a lower pressure.
*subject to the frame being able to accommodate the wider tyre.
Oh well... I'll just run them at 120. It's just a bit annoying when you buy a tyre that is placarded to 145 psi and put them on a rim where the manufacturer states 140psi and the tyre blows off it comfortably under both specified maximums. Oh well.
Given it has been bought as essentially a training tyre I guess I can handle a little more rolling resistance and enjoy a better ride. If it's as long wearing and as puncture and chip resistant as they claim then it will still be a good outcome.
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Re: Schwalbe Ultremo blowing off rim
Postby Comedian » Wed Nov 30, 2011 8:11 am
Anyway, he says it shouldn't blast off up to 290 psi!!!!! I'm going to send him some more info on it tonight but I suspect it was just something about the way I was fitting it. The only way to confirm this now is to blow it up to 140 (max for the rim) and wait a while. I might do that one time after a few beers to calm my nerves.
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Re: Schwalbe Ultremo blowing off rim
Postby Clydesdale Scot » Wed Nov 30, 2011 8:21 am
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Re: Schwalbe Ultremo blowing off rim
Postby Nobody » Wed Nov 30, 2011 1:15 pm
Another option is to run the 23s you want on wider rims and therefore can run lower pressures. I've got Ribino Pros 23s that measure 24mm front, 25mm rear due to 17mm front, 19mm rear (inner) rims.Clydesdale Scot wrote:if you continue to have issues then you could try a wider tyre*, thus achieving the 15% tyre drop at a lower pressure.
*subject to the frame being able to accommodate the wider tyre.
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Re: Schwalbe Ultremo blowing off rim
Postby goneriding » Wed Nov 30, 2011 2:22 pm
Perhaps a call/email to Schwable might be in order?
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Re: Schwalbe Ultremo blowing off rim
Postby jacks1071 » Wed Nov 30, 2011 3:37 pm
Maybe so, that'd be the ABSOLUTE MAX, NO SAFETY MARGIN. Pump it up to 140 and go ride in the sun for an hour or do a decent and you could quite possibly be looking at 160 psi and you're way into the danger zone for rim failure, tyre failure etc.. Leave a road tyre in your car parked in the sun up here and the pressure will go so high from heat expansion that the tube will have failed by the end of the day.Comedian wrote:
it says 84-145 stamped on the tyre!
Mavic say 138 is their recommended max.
Manufacturers put these crazy max psi ratings on the sides of tyres I think in the hope that a punter will walk around a shop and pick one with the biggest max psi limit.
Even a really big heavy guy, 120psi is pleanty. I only run 100psi on our tandem and we are about 145kg (28mm tyres), if I was running 23mm tyres I'd put the pressure up to 110-120psi.
There is no benefit to running them at more than required and quite a few downsides to it.
Anyway I'm not saying that there isn't something wrong with your tyre - but you are pumping them up far too hard.
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Re: Schwalbe Ultremo blowing off rim
Postby greyhoundtom » Thu Dec 01, 2011 7:37 am
For puttering around on the road I run schwalbe Lugano for a bit more puncture protection at 120 on the rear and 100 on the front. For the crits I use the schwalbe Stelvio’s 140 on the rear and 120 on the front without any problems all on cheap Shimano rims, and I weigh in at 96 kg.
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Re: Schwalbe Ultremo blowing off rim
Postby stnfldr » Thu Dec 01, 2011 7:50 am
Ben
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Re: Schwalbe Ultremo blowing off rim
Postby trailgumby » Sat Dec 03, 2011 9:25 pm
120psi ...
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