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#31
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Schwalbe Marathon Plus Failure
Roger Merriman wrote:
Except in special cases for special bikes, sidewalls are reinforced to make the sidwalls more durable, not to make the tyre more pinch-flat resistant. Skinwalls are prone to getting cut and split. some are, some are talking about pinch flats. They might be talking BS - which wouldn't be an unusual thing for a tyre manufacturer to do. I didn't notice very much difference anyway when comparing M+ to Specialzed Nimbus EX. (Same bike, same size tyres, same pressure). The Nimbuses have skinny sidewalls. what sizes? rember i'm talking ballon tires really, 35-38mm i noticed quite a lot of differance between the various tires i've had on there. Same here, 38mm. Not on one of my own bikes, to be fair, so I haven't ridden it a great deal, but one I do the odd job on. In fact I'll be fitting a new wheel to it soon and transfering the tyre, so I'll remind myself what the M+ sidewalls feel like. I don't remember them being much out of the ordinary. ~PB |
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#32
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Schwalbe Marathon Plus Failure
Pete Biggs wrote:
Roger Merriman wrote: A pinch flat happens when the tyre gets completely compressed. Feel how easy it is to completely compress the tyre when it is uninflated. Compare it to the inflated tyre and think how many times harder it is. The difference in resistance between the M+'s sidewalls and the skinniest sidewalls possible is dwarfed by the tremendous force of the compressed air. lots of companies would disagree, since a fair number produce tires with reforced sidewalls, from MTB to BMX and all between, and around. Except in special cases for special bikes, sidewalls are reinforced to make the sidwalls more durable, not to make the tyre more pinch-flat resistant. Skinwalls are prone to getting cut and split. some are, some are talking about pinch flats. we are not talking 200PSI here but 80PSI most tires have a bit of give at that pressure, Of course there is give, but it takes many more times the force to get that give (compress the air) than it takes to compress the sidewalls. Try completely compressing your tyres at 80 psi with your fingers (you won't be able to). Now try at 0 psi (you will be able to easily). Note the huge difference. That alone should prove to you that the sidewalls can do hardly anything to prevent pinch flats. The force from your fingers is nothing compared to the force of hitting a bump with your weight on the bike. marthons compared to some tires give a much harsher ride, for given pressure, compared to the three types of tires on before the Marthon pluses are harsh, not just I rereviews it comes up. The whole tyre material, not just the sidewalls, contributes to rolling resisance and how harsh a tyre feels. M+ has an unusually thick layer under the tread. But still it's very little compared to the resistance from compressed air. i don't think the plus feel much differnet to the standard which i have on another bike and feels equally fairly harsh. I didn't notice very much difference anyway when comparing M+ to Specialzed Nimbus EX. (Same bike, same size tyres, same pressure). The Nimbuses have skinny sidewalls. what sizes? rember i'm talking ballon tires really, 35-38mm i noticed quite a lot of differance between the various tires i've had on there. I'm still skeptical that your differing experience was anything to do with the amount protection that the tyres themselves provided. I'm thinking maybe they were actually inflated differently, or it was just coincidence. i kept the land cruisers for a while and upped the pressures to 100PSI from the max psi of 65PSI but it still got the odd pinch flats, with the marthon + at a lower PSI of 80 or lower i've never had a pinch flat. Something funny was going on to get pinch flats (if that's what they were) with wide tyres at 100 psi, and it was nothing to do with the sidewall, IMHO. as almost all my weight is on the rear, with all the gear in the paniers the bike is 50lb unlaided, i don't hang about nor care too much with that bike as to speed bumps etc, even with the pluses you can feel a fair amount of give as the tire deflects a bit, i'm fairly brutish to that bike as it's the work horse, it gets the job done. Sometimes a problem with the rim or rim tape can cause a puncture that looks like a pinch-flat. Or you may be riding differently now, or having better luck with what you don't hit. unlikely as I feel the rim hit, much as one would pre suspention going though rock gardens if you fluffed your line. A big impact with a hard tyre can feel lke the rim is hitting when it actually isn't. But if the rim really is hitting then you need even higher pressure. +10 psi will make far more difference than that from different sidewalls. same "oof" but if you bottom out you'll feel the rim touch down, and think oh shoot or what ever. with the marthons i can feel the tire bulge under the load but it doesn't attaully bottom out. I feel sorry for your wheels! :-) you should do the rears last no time at all, few months maybe then the hubs give out, get to the point where i have two wheel stearing... ~PB roger -- www.rogermerriman.com |
#33
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Schwalbe Marathon Plus Failure
On Sep 9, 2:23*am, "Pete Biggs"
p...@pomegranateremovehighlyimpracticalfruitbiggs .tc wrote: Roger Merriman wrote: Except in special cases for special bikes, sidewalls are reinforced to make the sidwalls more durable, not to make the tyre more pinch-flat resistant. Skinwalls are prone to getting cut and split. some are, some are talking about pinch flats. They might be talking BS - which wouldn't be an unusual thing for a tyre manufacturer to do. While I am agnostic about the value of tougher sidewalls for pinch flats, it should be noted that the pinch requires not only that the walls are pushed together, but that the pressure between them is high enough to cut through the inner tube. It seems plausible that a thicker sidewall might help with this by spreading out the pressure point, blunting the impact a bit. James |
#34
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Schwalbe Marathon Plus Failure
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#35
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Schwalbe Marathon Plus Failure
Roger Merriman wrote:
rember i'm talking ballon tires really, 35-38mm i noticed quite a lot of differance between the various tires i've had on there. Were your previous tyres 35mm and your current ones 38mm? 35mm tyres need more psi to get the same protection. with the marthons i can feel the tire bulge under the load but it doesn't attaully bottom out. It will bottom out just as easily as any other tyre (I can do it with my fingers when uninflated), but perhaps the thick padding under the tread makes it feel as if it isn't. I feel sorry for your wheels! :-) you should do the rears last no time at all, few months maybe then the hubs give out, get to the point where i have two wheel stearing... Boringly, I would ride more carefullly! ~PB |
#36
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Schwalbe Marathon Plus Failure
On Mon, 8 Sep 2008, Pete Biggs wrote:
Roger Merriman wrote: Except in special cases for special bikes, sidewalls are reinforced to make the sidwalls more durable, not to make the tyre more pinch-flat resistant. Skinwalls are prone to getting cut and split. some are, some are talking about pinch flats. They might be talking BS - which wouldn't be an unusual thing for a tyre manufacturer to do. Really? I would have thought they'd be more likely to be talking DIN. tom -- Baby got a masterplan. A foolproof masterplan. |
#37
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Schwalbe Marathon Plus Failure
On Tue, 9 Sep 2008 23:06:44 +0100
Tom Anderson wrote: On Mon, 8 Sep 2008, Pete Biggs wrote: are, some are talking about pinch flats. They might be talking BS - which wouldn't be an unusual thing for a tyre manufacturer to do. Really? I would have thought they'd be more likely to be talking DIN. Is that your coat by the door? :-) |
#38
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Schwalbe Marathon Plus Failure
On Wed, 10 Sep 2008, Rob Morley wrote:
On Tue, 9 Sep 2008 23:06:44 +0100 Tom Anderson wrote: On Mon, 8 Sep 2008, Pete Biggs wrote: are, some are talking about pinch flats. They might be talking BS - which wouldn't be an unusual thing for a tyre manufacturer to do. Really? I would have thought they'd be more likely to be talking DIN. Is that your coat by the door? :-) I'm here all week, folks! tom -- And dear lord, its like peaches in a lacy napkin. -- James Dearden |
#39
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Schwalbe Marathon Plus Failure
I had the exact same failure on my last Schwalbe Marathon rear tyre after 6 months of light use. Unfortunately it was one week out of warranty and the seller refused any service and also censored my polite but honest review of the product on their website. I have been through a few marathons before and not had this problem, so I hope this is a one-off but now I'm on a cheaper competitor's tyre and so far so good. |
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