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#1
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Double Tubing Update
It had turned into a great day. After about 55 miles into my 95 mi.
trip I had a slight wind pushing me along and I was going to make some time. The asphalt had buckled against the expansion joints but no need to slow down or swerve. I was double tubed. The first bad bump was about 5" above the bridge deck. The front wheel came down not quiet properly aligned with the direction of motion and the water bottle flew out. I recovered the water bottle and quickly resumed riding in the same fashion. A mile later the same happened again except with a softer bounce. The water bottle stayed put. The front tire was definitely softer than when I started out. I thought, finally an opportunity to ride on one tube but it quickly became clear that _both_ tubes had pinch flat punctures. This brought up one advantage of double tubing. If the innertube rubber is pretty thick and if you shift as much weight as possible to the back wheel, you can more or less ride on the flat tire for short distances. I'll check to see if the punctures on each tube are side by side indicating that both pinch flats happened on the same bump. If not then the usage other cyclists have been recommending may hold. Once one tube goes down then inflate the other tube, at least on longer trips. Bret Cahill |
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#2
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Double Tubing Update
It had turned into a great day. *After about 55 miles into my 95 mi.
trip I had a slight wind pushing me along and I was going to make some time. *The asphalt had buckled against the expansion joints but no need to slow down or swerve. *I was double tubed. The first bad bump was about 5" above the bridge deck. *The front wheel came down not quiet properly aligned with the direction of motion and the water bottle flew out. *I recovered the water bottle and quickly resumed riding in the same fashion. *A mile later the same happened again except with a softer bounce. *The water bottle stayed put. *The front tire was definitely softer than when I started out. *I thought, finally an opportunity to ride on one tube but it quickly became clear that _both_ tubes had pinch flat punctures. This brought up one advantage of double tubing. *If the innertube rubber is pretty thick and if you shift as much weight as possible to the back wheel, you can more or less ride on the flat tire for short distances. I'll check to see if the punctures on each tube are side by side indicating that both pinch flats happened on the same bump. If not then the usage other cyclists have been recommending may hold. Once one tube goes down then inflate the other tube, at least on longer trips. Two punctures lined up, side by side, but a shard of glass still in the tire indicated it wasn't a pinch flat over one bad bump. It wouldn't have been a likely scenario for me to get the glass out before the 2nd tube went down. What's really curious is the 2 tubes only leak in two places each after 33 miles of rim riding. Bret Cahill |
#3
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Double Tubing Update
On Dec 30, 4:54*am, Bret Cahill wrote:
It had turned into a great day. *After about 55 miles into my 95 mi. trip I had a slight wind pushing me along and I was going to make some time. *The asphalt had buckled against the expansion joints but no need to slow down or swerve. *I was double tubed. The first bad bump was about 5" above the bridge deck. *The front wheel came down not quiet properly aligned with the direction of motion and the water bottle flew out. *I recovered the water bottle and quickly resumed riding in the same fashion. *A mile later the same happened again except with a softer bounce. *The water bottle stayed put. *The front tire was definitely softer than when I started out. *I thought, finally an opportunity to ride on one tube but it quickly became clear that _both_ tubes had pinch flat punctures. This brought up one advantage of double tubing. *If the innertube rubber is pretty thick and if you shift as much weight as possible to the back wheel, you can more or less ride on the flat tire for short distances. I'll check to see if the punctures on each tube are side by side indicating that both pinch flats happened on the same bump. If not then the usage other cyclists have been recommending may hold. Once one tube goes down then inflate the other tube, at least on longer trips. Two punctures lined up, side by side, but a shard of glass still in the tire indicated it wasn't a pinch flat over one bad bump. *It wouldn't have been a likely scenario for me to get the glass out before the 2nd tube went down. What's really curious is the 2 tubes only leak in two places each after 33 miles of rim riding. Bret Cahill- Hide quoted text - - Show quoted text - Get some Schwalbe Durano Plus tyres. Pump up to 120 psi. The end. -- Simon Mason |
#4
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Double Tubing Update
On Dec 30, 4:54*am, Bret Cahill wrote:
It had turned into a great day. *After about 55 miles into my 95 mi. trip I had a slight wind pushing me along and I was going to make some time. *The asphalt had buckled against the expansion joints but no need to slow down or swerve. *I was double tubed. The first bad bump was about 5" above the bridge deck. *The front wheel came down not quiet properly aligned with the direction of motion and the water bottle flew out. *I recovered the water bottle and quickly resumed riding in the same fashion. *A mile later the same happened again except with a softer bounce. *The water bottle stayed put. *The front tire was definitely softer than when I started out. *I thought, finally an opportunity to ride on one tube but it quickly became clear that _both_ tubes had pinch flat punctures. This brought up one advantage of double tubing. *If the innertube rubber is pretty thick and if you shift as much weight as possible to the back wheel, you can more or less ride on the flat tire for short distances. I'll check to see if the punctures on each tube are side by side indicating that both pinch flats happened on the same bump. If not then the usage other cyclists have been recommending may hold. Once one tube goes down then inflate the other tube, at least on longer trips. Two punctures lined up, side by side, but a shard of glass still in the tire indicated it wasn't a pinch flat over one bad bump. *It wouldn't have been a likely scenario for me to get the glass out before the 2nd tube went down. What's really curious is the 2 tubes only leak in two places each after 33 miles of rim riding. Bret Cahill The perceived risk of further punctures has been a concern of mine when getting a flat on tubular tyres, which is why I'll pump the tyres back up as soon as the rims are knocking and see how long they hold. With your report here, I may continue to ride on the rim for longer than I have previously, just as one should to finish a bicycle race. |
#5
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Double Tubing Update
It had turned into a great day. *After about 55 miles into my 95 mi..
trip I had a slight wind pushing me along and I was going to make some time. *The asphalt had buckled against the expansion joints but no need to slow down or swerve. *I was double tubed. The first bad bump was about 5" above the bridge deck. *The front wheel came down not quiet properly aligned with the direction of motion and the water bottle flew out. *I recovered the water bottle and quickly resumed riding in the same fashion. *A mile later the same happened again except with a softer bounce. *The water bottle stayed put. *The front tire was definitely softer than when I started out. *I thought, finally an opportunity to ride on one tube but it quickly became clear that _both_ tubes had pinch flat punctures. This brought up one advantage of double tubing. *If the innertube rubber is pretty thick and if you shift as much weight as possible to the back wheel, you can more or less ride on the flat tire for short distances. I'll check to see if the punctures on each tube are side by side indicating that both pinch flats happened on the same bump. If not then the usage other cyclists have been recommending may hold. Once one tube goes down then inflate the other tube, at least on longer trips. Two punctures lined up, side by side, but a shard of glass still in the tire indicated it wasn't a pinch flat over one bad bump. *It wouldn't have been a likely scenario for me to get the glass out before the 2nd tube went down. What's really curious is the 2 tubes only leak in two places each after 33 miles of rim riding. Bret Cahill The perceived risk of further punctures has been a concern of mine when getting a flat on tubular tyres, which is why I'll pump the tyres back up as soon as the rims are knocking and see how long they hold. With your report here, I may continue to ride on the rim for longer than I have previously, just as one should to finish a bicycle race. You'd have to have quite a lead or be near the finish for that to work. Also two flattened tubes will holdup better than just one, 2 thick wall tubes a lot better. Also the tire casing/belts will probably be damaged. If it's damaged the tire will be lumpy when it's reinflated to full pressure. I'll pump this one up in increments with a single tube to save time but it's all but certain to rip apart above 45 psi. Bret Cahill |
#6
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Double Tubing Update
It had turned into a great day. *After about 55 miles into my 95 mi..
trip I had a slight wind pushing me along and I was going to make some time. *The asphalt had buckled against the expansion joints but no need to slow down or swerve. *I was double tubed. The first bad bump was about 5" above the bridge deck. *The front wheel came down not quiet properly aligned with the direction of motion and the water bottle flew out. *I recovered the water bottle and quickly resumed riding in the same fashion. *A mile later the same happened again except with a softer bounce. *The water bottle stayed put. *The front tire was definitely softer than when I started out. *I thought, finally an opportunity to ride on one tube but it quickly became clear that _both_ tubes had pinch flat punctures. This brought up one advantage of double tubing. *If the innertube rubber is pretty thick and if you shift as much weight as possible to the back wheel, you can more or less ride on the flat tire for short distances. I'll check to see if the punctures on each tube are side by side indicating that both pinch flats happened on the same bump. If not then the usage other cyclists have been recommending may hold. Once one tube goes down then inflate the other tube, at least on longer trips. Two punctures lined up, side by side, but a shard of glass still in the tire indicated it wasn't a pinch flat over one bad bump. *It wouldn't have been a likely scenario for me to get the glass out before the 2nd tube went down. What's really curious is the 2 tubes only leak in two places each after 33 miles of rim riding. Bret Cahill- Hide quoted text - - Show quoted text - Get some Schwalbe Durano Plus tyres. Pump up to 120 psi. The end. I'll continue my testing. This will require a lot of riding for a good cost benefit risk analysis. Bret Cahill |
#7
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Double Tubing Update
On Thu, 29 Dec 2011 22:26:07 -0800, Simon Mason couldnae haud thur wheesht
ony mair an' gied us this: On Dec 30, 4:54Â*am, Bret Cahill wrote: It had turned into a great day. Â*After about 55 miles into my 95 mi. trip I had a slight wind pushing me along and I was going to make some time. Â*The asphalt had buckled against the expansion joints but no need to slow down or swerve. Â*I was double tubed. The first bad bump was about 5" above the bridge deck. Â*The front wheel came down not quiet properly aligned with the direction of motion and the water bottle flew out. Â*I recovered the water bottle and quickly resumed riding in the same fashion. Â*A mile later the same happened again except with a softer bounce. Â*The water bottle stayed put. Â*The front tire was definitely softer than when I started out. Â*I thought, finally an opportunity to ride on one tube but it quickly became clear that _both_ tubes had pinch flat punctures. This brought up one advantage of double tubing. Â*If the innertube rubber is pretty thick and if you shift as much weight as possible to the back wheel, you can more or less ride on the flat tire for short distances. I'll check to see if the punctures on each tube are side by side indicating that both pinch flats happened on the same bump. If not then the usage other cyclists have been recommending may hold. Once one tube goes down then inflate the other tube, at least on longer trips. Two punctures lined up, side by side, but a shard of glass still in the tire indicated it wasn't a pinch flat over one bad bump. Â*It wouldn't have been a likely scenario for me to get the glass out before the 2nd tube went down. What's really curious is the 2 tubes only leak in two places each after 33 miles of rim riding. Bret Cahill- Hide quoted text - - Show quoted text - Get some Schwalbe Durano Plus tyres. Pump up to 120 psi. The end. On 2 separate occasions, I recently cycled home about 8 miles each time on a flat Marathon Plus tyre. It felt ok (back wheel) as long as I didn't sit down passing over rough sections. Decided it would be quicker to ride slowly, than stop to fix the puncture, as the tyres are such a tight fit on my rims, this would be a c.half-hour job (in miserably cold rain). As it turned out, the punctures were caused by bad rim tape, rather than the tyre itself, so M+'s are still wonderful, even when deliberately run flat. :-) -- Perpetual Calendar - http://www.1r5.net Facebook - http://www.facebook.com/1r5.net Email - |
#8
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Double Tubing Update
It had turned into a great day. *After about 55 miles into my 95 mi.
trip I had a slight wind pushing me along and I was going to make some time. *The asphalt had buckled against the expansion joints but no need to slow down or swerve. *I was double tubed. The first bad bump was about 5" above the bridge deck. *The front wheel came down not quiet properly aligned with the direction of motion and the water bottle flew out. *I recovered the water bottle and quickly resumed riding in the same fashion. *A mile later the same happened again except with a softer bounce. *The water bottle stayed put. *The front tire was definitely softer than when I started out. *I thought, finally an opportunity to ride on one tube but it quickly became clear that _both_ tubes had pinch flat punctures. This brought up one advantage of double tubing. *If the innertube rubber is pretty thick and if you shift as much weight as possible to the back wheel, you can more or less ride on the flat tire for short distances. I'll check to see if the punctures on each tube are side by side indicating that both pinch flats happened on the same bump. If not then the usage other cyclists have been recommending may hold. Once one tube goes down then inflate the other tube, at least on longer trips. Two punctures lined up, side by side, but a shard of glass still in the tire indicated it wasn't a pinch flat over one bad bump. *It wouldn't have been a likely scenario for me to get the glass out before the 2nd tube went down. What's really curious is the 2 tubes only leak in two places each after 33 miles of rim riding. Bret Cahill The perceived risk of further punctures has been a concern of mine when getting a flat on tubular tyres, which is why I'll pump the tyres back up as soon as the rims are knocking and see how long they hold. With your report here, I may continue to ride on the rim for longer than I have previously, just as one should to finish a bicycle race. You'd have to have quite a lead or be near the finish for that to work. *Also two flattened tubes will holdup better than just one, 2 thick wall tubes a lot better. *Also the tire casing/belts will probably be damaged. *If it's damaged the tire will be lumpy when it's reinflated to full pressure. *I'll pump this one up in increments with a single tube to save time but it's all but certain to rip apart above 45 psi. The tire held up at 50 psi. My doctor just told me to start eating steak, whatever it takes to get my weight up to 200 lbs. That's not gonna happen but I will eat a steak tonight. Bret Cahill |
#9
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Double Tubing Update
Bret Cahill wrote:
It had turned into a great day. After about 55 miles into my 95 mi. trip I had a slight wind pushing me along and I was going to make some time. The asphalt had buckled against the expansion joints but no need to slow down or swerve. I was double tubed. The first bad bump was about 5" above the bridge deck. The front wheel came down not quiet properly aligned with the direction of motion and the water bottle flew out. I recovered the water bottle and quickly resumed riding in the same fashion. A mile later the same happened again except with a softer bounce. The water bottle stayed put. The front tire was definitely softer than when I started out. I thought, finally an opportunity to ride on one tube but it quickly became clear that _both_ tubes had pinch flat punctures. This brought up one advantage of double tubing. If the innertube rubber is pretty thick and if you shift as much weight as possible to the back wheel, you can more or less ride on the flat tire for short distances. I'll check to see if the punctures on each tube are side by side indicating that both pinch flats happened on the same bump. If not then the usage other cyclists have been recommending may hold. Once one tube goes down then inflate the other tube, at least on longer trips. Two punctures lined up, side by side, but a shard of glass still in the tire indicated it wasn't a pinch flat over one bad bump. It wouldn't have been a likely scenario for me to get the glass out before the 2nd tube went down. it's not really likely that any sharp will not puncture both in a very short space of time. which kind of begs the question whats the point? What's really curious is the 2 tubes only leak in two places each after 33 miles of rim riding. Bret Cahill Sorry but I really can't see this being anything but a solution looking for a problem. tubeless tyres seem to be catching on slowly or simply robust tyres. Roger -- www.rogermerriman.com |
#10
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Double Tubing Update
It had turned into a great day. *After about 55 miles into my 95 mi..
trip I had a slight wind pushing me along and I was going to make some time. *The asphalt had buckled against the expansion joints but no need to slow down or swerve. *I was double tubed. The first bad bump was about 5" above the bridge deck. *The front wheel came down not quiet properly aligned with the direction of motion and the water bottle flew out. *I recovered the water bottle and quickly resumed riding in the same fashion. *A mile later the same happened again except with a softer bounce. *The water bottle stayed put. *The front tire was definitely softer than when I started out. *I thought, finally an opportunity to ride on one tube but it quickly became clear that _both_ tubes had pinch flat punctures. This brought up one advantage of double tubing. *If the innertube rubber is pretty thick and if you shift as much weight as possible to the back wheel, you can more or less ride on the flat tire for short distances. I'll check to see if the punctures on each tube are side by side indicating that both pinch flats happened on the same bump. If not then the usage other cyclists have been recommending may hold. Once one tube goes down then inflate the other tube, at least on longer trips. Two punctures lined up, side by side, but a shard of glass still in the tire indicated it wasn't a pinch flat over one bad bump. *It wouldn't have been a likely scenario for me to get the glass out before the 2nd tube went down. Tire pressure needs to be monitored more closely. This is very easy. it's not really likely that any sharp will not puncture both in a very short space of time. It depends on several factors, the locations of most punctures on the tire, the size of the tires and the location of the "seam" between the two tubes, the puncturing object, pinch flats, riding style. Obviously a larger tire presents a larger target so a typical puncturing object will tend to be further away from the seam. which kind of begs the question whats the point? R & D. It'll take a at least 10,000 miles to get an idea and that's deliberately swerving for glass, thorns, etc. The Titantic was a good idea. The owners just didn't do enough research before they declared, at least in their minds, that it was unsinkable. My mistake wasn't nearly as bad because, after all, I never really stopped. I just dropped my speed to 12 mph. What's really curious is the 2 tubes only leak in two places each after 33 miles of rim riding. Sorry but I really can't see this being anything but a solution looking for a problem. There's no such thing as one solution. tubeless tyres seem to be catching on slowly or simply robust tyres. I like to ride tires down to the fabric. Personal transportation should cost less than 0.03 cents/mile. The biggest advantage of double tubing may be the ability to ride on two flattened tubes without damaging the tire casing. Usually when an under inflated tire hits a pot hole or is ridden on the rim and then is re inflated to full pressure the belts rip diagonally and the tire becomes too lumpy for a smooth ride. Yesterday I pumped the tire -- single tubed -- up to 50 psi yesterday with no problems after riding a few miles. I just pumped it up to 65 psi and will try that for a 30 mile in a few minutes. I'll then try 80 then 90 psi, the rated pressure, to see if double tubing saved the tire. Part of the protection is due to the extra rubber from 2 tubes but most of it is the tubes don't bunch up. The tubes are glued together and pegged in two places instead of one by the valve stems. Both 700 c / 27" tubes are thin wall ~ 125 gms. Roger --www.rogermerriman.com- Hide quoted text - - Show quoted text - |
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