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#41
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How critical is road bike tire pressure max?
On Monday, April 23, 2018 at 7:07:32 AM UTC-7, Frank Krygowski wrote:
On 4/23/2018 2:00 AM, John B. wrote: On Sun, 22 Apr 2018 06:53:29 -0700, Joerg wrote: Pressure gauge? A seasoned cyclist should be able to gauge the tire pressure with a thunb. That sounds like an old experienced cyclist, but can you tell the difference between 65 psi and, say 70 psi? Years ago, our club used to run a family oriented picnic and bike tour of the local metropark. The picnic featured several bike-oriented games. One was to deflate your tire, then pump it up to the target pressure you chose, without the use of a gage. As I recall, there were guys who got within a couple percent of their target. I can't tell 10psi, particularly between tires with different casings and sizes. -- Jay Beattie. |
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#42
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How critical is road bike tire pressure max?
On 23/04/2018 10:14 AM, jbeattie wrote:
On Monday, April 23, 2018 at 7:07:32 AM UTC-7, Frank Krygowski wrote: On 4/23/2018 2:00 AM, John B. wrote: On Sun, 22 Apr 2018 06:53:29 -0700, Joerg wrote: Pressure gauge? A seasoned cyclist should be able to gauge the tire pressure with a thunb. That sounds like an old experienced cyclist, but can you tell the difference between 65 psi and, say 70 psi? Years ago, our club used to run a family oriented picnic and bike tour of the local metropark. The picnic featured several bike-oriented games. One was to deflate your tire, then pump it up to the target pressure you chose, without the use of a gage. As I recall, there were guys who got within a couple percent of their target. I can't tell 10psi, particularly between tires with different casings and sizes. Maybe that's Joerg's issue with pinch flats... |
#43
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How critical is road bike tire pressure max?
On 2018-04-22 23:00, John B. wrote:
On Sun, 22 Apr 2018 06:53:29 -0700, Joerg wrote: On 2018-04-20 17:46, John B. wrote: On Fri, 20 Apr 2018 10:25:59 -0700 (PDT), jbeattie wrote: On Thursday, April 19, 2018 at 10:45:47 AM UTC-7, Joerg wrote: On 2018-04-18 18:16, Andre Jute wrote: On Wednesday, April 18, 2018 at 6:02:49 PM UTC+1, Joerg wrote: Just received some 25mm Vee Rubber road tires and it says 7bar 100psi max on the side. That's a bit low for my taste. The Zafiro I have on there now says 100psi min and 130psi max which is more up my alley. By how much can a low max rating be exceeded? I like 100-115psi on my road bike in back. On the front I won't exceed the max because a blow-out would be nasty and that carries less weight anyhow. -- Regards, Joerg http://www.analogconsultants.com/ Is this some new California fad, riding offroad on narrow rubber? Whatever for? BTW, I have no problem with low- or zero-tread tyres because I ride mainly on tarmac, even in the narrowest lanes, but surely a mudplugger wants considerable mechanical grip. No fad but road bikes out here must cope with road sections that are either gravel or dirt. Part of life. There's a good reason not to blow up tyres over the max recommendation: It can get pretty nasty and expensive when overinflated tyres blow the rim apart. It is well worth reading Andy Blance, the designer of Sheldon's beloved Thorn bike, on tyre inflation: see page 36 at http://www.sjscycles.com/thornpdf/th...a_brochure.pdf It's a 30+ MB file and their server seems to be on an old dial-up line. I was a convert to comfortable suspension and inflation regimes already in my motor-racing days, and achieved the same results the same way in cycling: see http://thorncyclesforum.co.uk/index....16360#msg16360 (which is an extended version of a reply I first made on RBT to a query by Pete Cresswell) and read on in the ensuing very well-informed engineering discussion about ways of determining the optimum tyre inflation. In fact, there are all kinds of really good reasons for inflating bicycle tyres to the lowest you can get away with short of snake bites. Right, and then you get a pinch flat or snake bite which is often unfixable in the field. All it takes is one pothole. No thanks. Do you not carry a tube? You can squeeze one in next to the heart-lung machine, rope, winch and iron rail segment used for pounding in chain-pins with found fence nails. There should be room in your pannier somewhere. -- Jay Beattie. But unless your nickname is Mighty Lung Larry, you also need to carry a tire pump and then the pressure becomes a problem so you need to carry a pressure gauge.... Unless you are in the hills weght doesn't matter much. Also, my Topeak Pocket Rocket pump is small and doesn't weigh much. It is a lot better than CO2 cartridges that many cyclists then carelessly leave laying around on the ground. Pressure gauge? A seasoned cyclist should be able to gauge the tire pressure with a thunb. That sounds like an old experienced cyclist, but can you tell the difference between 65 psi and, say 70 psi? Not necessary. What's necessary is to be able to tell when it is too far below 100psi, say 80psi, and I can do that. Just one problem after another..... Take the car? For comparable health benefits it would need to be muscle-powered. http://thenewswheel.com/wp-content/t...=90&w=660&zc=1 If you look into the matter you find that bicycling is certainly better then sitting on the couch watching Oprah but that is about it. Even marching at the standard rate (116 beats a minute with a 30 inch pace) is a better exercise, ... That's what a former colleague also though. Until his right hip wore out. ... both as a weight bearing activity and for the heart-lung machine and if you get really frisky and try any of the elite army unit "tads" then you are talking about 12 miles in 3 hours carrying 32 Kg. in the U.S. Army, while the Romans, in ancient times, did 35 km. in 5 hours carrying 20 kg. Having served I am (painfully) aware of that. However, we were in our 20's, not close to retirement like now. BTW, the US Army has switched to the metric system for distances many moons ago. -- Regards, Joerg http://www.analogconsultants.com/ |
#44
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How critical is road bike tire pressure max?
On Mon, 23 Apr 2018 09:36:00 -0700, Joerg
wrote: On 2018-04-22 23:00, John B. wrote: On Sun, 22 Apr 2018 06:53:29 -0700, Joerg wrote: On 2018-04-20 17:46, John B. wrote: On Fri, 20 Apr 2018 10:25:59 -0700 (PDT), jbeattie wrote: On Thursday, April 19, 2018 at 10:45:47 AM UTC-7, Joerg wrote: On 2018-04-18 18:16, Andre Jute wrote: On Wednesday, April 18, 2018 at 6:02:49 PM UTC+1, Joerg wrote: Just received some 25mm Vee Rubber road tires and it says 7bar 100psi max on the side. That's a bit low for my taste. The Zafiro I have on there now says 100psi min and 130psi max which is more up my alley. By how much can a low max rating be exceeded? I like 100-115psi on my road bike in back. On the front I won't exceed the max because a blow-out would be nasty and that carries less weight anyhow. -- Regards, Joerg http://www.analogconsultants.com/ Is this some new California fad, riding offroad on narrow rubber? Whatever for? BTW, I have no problem with low- or zero-tread tyres because I ride mainly on tarmac, even in the narrowest lanes, but surely a mudplugger wants considerable mechanical grip. No fad but road bikes out here must cope with road sections that are either gravel or dirt. Part of life. There's a good reason not to blow up tyres over the max recommendation: It can get pretty nasty and expensive when overinflated tyres blow the rim apart. It is well worth reading Andy Blance, the designer of Sheldon's beloved Thorn bike, on tyre inflation: see page 36 at http://www.sjscycles.com/thornpdf/th...a_brochure.pdf It's a 30+ MB file and their server seems to be on an old dial-up line. I was a convert to comfortable suspension and inflation regimes already in my motor-racing days, and achieved the same results the same way in cycling: see http://thorncyclesforum.co.uk/index....16360#msg16360 (which is an extended version of a reply I first made on RBT to a query by Pete Cresswell) and read on in the ensuing very well-informed engineering discussion about ways of determining the optimum tyre inflation. In fact, there are all kinds of really good reasons for inflating bicycle tyres to the lowest you can get away with short of snake bites. Right, and then you get a pinch flat or snake bite which is often unfixable in the field. All it takes is one pothole. No thanks. Do you not carry a tube? You can squeeze one in next to the heart-lung machine, rope, winch and iron rail segment used for pounding in chain-pins with found fence nails. There should be room in your pannier somewhere. -- Jay Beattie. But unless your nickname is Mighty Lung Larry, you also need to carry a tire pump and then the pressure becomes a problem so you need to carry a pressure gauge.... Unless you are in the hills weght doesn't matter much. Also, my Topeak Pocket Rocket pump is small and doesn't weigh much. It is a lot better than CO2 cartridges that many cyclists then carelessly leave laying around on the ground. Pressure gauge? A seasoned cyclist should be able to gauge the tire pressure with a thunb. That sounds like an old experienced cyclist, but can you tell the difference between 65 psi and, say 70 psi? Not necessary. What's necessary is to be able to tell when it is too far below 100psi, say 80psi, and I can do that. Just one problem after another..... Take the car? For comparable health benefits it would need to be muscle-powered. http://thenewswheel.com/wp-content/t...=90&w=660&zc=1 If you look into the matter you find that bicycling is certainly better then sitting on the couch watching Oprah but that is about it. Even marching at the standard rate (116 beats a minute with a 30 inch pace) is a better exercise, ... That's what a former colleague also though. Until his right hip wore out. ... both as a weight bearing activity and for the heart-lung machine and if you get really frisky and try any of the elite army unit "tads" then you are talking about 12 miles in 3 hours carrying 32 Kg. in the U.S. Army, while the Romans, in ancient times, did 35 km. in 5 hours carrying 20 kg. Having served I am (painfully) aware of that. However, we were in our 20's, not close to retirement like now. I'm older then you and I can still walk. Exercise, like any other physical activity, must take into account the age and physical condition of the individual. If you read what I wrote, and understood it, I mentioned the "Tabs" as something that elite troops might do. Not Joe Dobbs, average soldier. BTW, the US Army has switched to the metric system for distances many moons ago. Who cares? Any measuring system works for those that understand the system. 1 inch and 25.4mm are the same distance. -- Cheers, John B. |
#45
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How critical is road bike tire pressure max?
On Mon, 23 Apr 2018 08:01:13 -0500, AMuzi wrote:
On 4/23/2018 1:00 AM, John B. wrote: On Sun, 22 Apr 2018 06:53:29 -0700, Joerg wrote: On 2018-04-20 17:46, John B. wrote: On Fri, 20 Apr 2018 10:25:59 -0700 (PDT), jbeattie wrote: On Thursday, April 19, 2018 at 10:45:47 AM UTC-7, Joerg wrote: On 2018-04-18 18:16, Andre Jute wrote: On Wednesday, April 18, 2018 at 6:02:49 PM UTC+1, Joerg wrote: Just received some 25mm Vee Rubber road tires and it says 7bar 100psi max on the side. That's a bit low for my taste. The Zafiro I have on there now says 100psi min and 130psi max which is more up my alley. By how much can a low max rating be exceeded? I like 100-115psi on my road bike in back. On the front I won't exceed the max because a blow-out would be nasty and that carries less weight anyhow. -- Regards, Joerg http://www.analogconsultants.com/ Is this some new California fad, riding offroad on narrow rubber? Whatever for? BTW, I have no problem with low- or zero-tread tyres because I ride mainly on tarmac, even in the narrowest lanes, but surely a mudplugger wants considerable mechanical grip. No fad but road bikes out here must cope with road sections that are either gravel or dirt. Part of life. There's a good reason not to blow up tyres over the max recommendation: It can get pretty nasty and expensive when overinflated tyres blow the rim apart. It is well worth reading Andy Blance, the designer of Sheldon's beloved Thorn bike, on tyre inflation: see page 36 at http://www.sjscycles.com/thornpdf/th...a_brochure.pdf It's a 30+ MB file and their server seems to be on an old dial-up line. I was a convert to comfortable suspension and inflation regimes already in my motor-racing days, and achieved the same results the same way in cycling: see http://thorncyclesforum.co.uk/index....16360#msg16360 (which is an extended version of a reply I first made on RBT to a query by Pete Cresswell) and read on in the ensuing very well-informed engineering discussion about ways of determining the optimum tyre inflation. In fact, there are all kinds of really good reasons for inflating bicycle tyres to the lowest you can get away with short of snake bites. Right, and then you get a pinch flat or snake bite which is often unfixable in the field. All it takes is one pothole. No thanks. Do you not carry a tube? You can squeeze one in next to the heart-lung machine, rope, winch and iron rail segment used for pounding in chain-pins with found fence nails. There should be room in your pannier somewhere. -- Jay Beattie. But unless your nickname is Mighty Lung Larry, you also need to carry a tire pump and then the pressure becomes a problem so you need to carry a pressure gauge.... Unless you are in the hills weght doesn't matter much. Also, my Topeak Pocket Rocket pump is small and doesn't weigh much. It is a lot better than CO2 cartridges that many cyclists then carelessly leave laying around on the ground. Pressure gauge? A seasoned cyclist should be able to gauge the tire pressure with a thunb. That sounds like an old experienced cyclist, but can you tell the difference between 65 psi and, say 70 psi? Just one problem after another..... Take the car? For comparable health benefits it would need to be muscle-powered. http://thenewswheel.com/wp-content/t...=90&w=660&zc=1 If you look into the matter you find that bicycling is certainly better then sitting on the couch watching Oprah but that is about it. Even marching at the standard rate (116 beats a minute with a 30 inch pace) is a better exercise, both as a weight bearing activity and for the heart-lung machine and if you get really frisky and try any of the elite army unit "tads" then you are talking about 12 miles in 3 hours carrying 32 Kg. in the U.S. Army, while the Romans, in ancient times, did 35 km. in 5 hours carrying 20 kg. Sometimes but not every day. Gaius Iulius notes that those 'hard march' events were rare. Sun Tzu explains the downside in depth. Marching at the "standard rate" was the normal way that troops were moved from place to place and was, back in the day, done on a daily basis. What the British call "Tabs" were considerably more strenuous as it was essentially marching at a somewhat faster cadence carrying substantial weight. The Roman Legions apparently marched for about 2/3rds of a day carrying their gear and weapons - a Century did have several mule carts assigned for carrying tents and other gear - and then built a camp before "falling out" for the night. According to Caesar's reports from Gaul this went on for days at a time. -- Cheers, John B. |
#46
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How critical is road bike tire pressure max?
On Mon, 23 Apr 2018 10:07:29 -0400, Frank Krygowski
wrote: On 4/23/2018 2:00 AM, John B. wrote: On Sun, 22 Apr 2018 06:53:29 -0700, Joerg wrote: Pressure gauge? A seasoned cyclist should be able to gauge the tire pressure with a thunb. That sounds like an old experienced cyclist, but can you tell the difference between 65 psi and, say 70 psi? Years ago, our club used to run a family oriented picnic and bike tour of the local metropark. The picnic featured several bike-oriented games. One was to deflate your tire, then pump it up to the target pressure you chose, without the use of a gage. As I recall, there were guys who got within a couple percent of their target. Yes, I run my normal road bike tires at around 80 - 90 PSI and I can hit this pressure pretty well without a gauge. But being told to pump the tires to 37.5 PSI and even coming close is a whole different situation. As an aside, I've noticed that when sitting by the side of the road in the rain and fixing a flat, and pumping up the tire with one of those small hand pumps that the pressure I felt was "O.K." was substantially below the pressure that I considered normal with my floor pump at home :-) -- Cheers, John B. |
#47
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How critical is road bike tire pressure max?
On 2018-04-23 17:48, John B. wrote:
[...] The Roman Legions apparently marched for about 2/3rds of a day carrying their gear and weapons - a Century did have several mule carts assigned for carrying tents and other gear - and then built a camp before "falling out" for the night. According to Caesar's reports from Gaul this went on for days at a time. You believe Caesar's writers? I never did. Whenever they got beaten the snot out of them they wrote "the winds were unfavorable" or whatever. If they wrote the truth they'd likely have "disappeared". -- Regards, Joerg http://www.analogconsultants.com/ |
#48
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How critical is road bike tire pressure max?
On Tue, 24 Apr 2018 07:51:23 -0700, Joerg
wrote: On 2018-04-23 17:48, John B. wrote: [...] The Roman Legions apparently marched for about 2/3rds of a day carrying their gear and weapons - a Century did have several mule carts assigned for carrying tents and other gear - and then built a camp before "falling out" for the night. According to Caesar's reports from Gaul this went on for days at a time. You believe Caesar's writers? I never did. Whenever they got beaten the snot out of them they wrote "the winds were unfavorable" or whatever. If they wrote the truth they'd likely have "disappeared". Caesar was essentially a politician and wrote his reports specifically to keep his name before both the population and the rulers of Rome while he was absent from the city (I believe that he paid to have them read publicly) and thus they were always complementary. However other evidence does show that he generally did accomplish when he claimed to have done. For example, he claimed to have sold some 53,000 Adualeui into slavery and independent sources show that the price of slaves in the Mediterranean area dropped to all time lows in the same period, which would tend to demonstrate that there was a large influx of slaves, from somewhere, during this period. -- Cheers, John B. |
#49
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How critical is road bike tire pressure max?
On Wednesday, April 25, 2018 at 1:14:01 AM UTC+1, John B. wrote:
On Tue, 24 Apr 2018 07:51:23 -0700, Joerg wrote: On 2018-04-23 17:48, John B. wrote: [...] The Roman Legions apparently marched for about 2/3rds of a day carrying their gear and weapons - a Century did have several mule carts assigned for carrying tents and other gear - and then built a camp before "falling out" for the night. According to Caesar's reports from Gaul this went on for days at a time. You believe Caesar's writers? I never did. Whenever they got beaten the snot out of them they wrote "the winds were unfavorable" or whatever. If they wrote the truth they'd likely have "disappeared". Caesar was essentially a politician and wrote his reports specifically to keep his name before both the population and the rulers of Rome while he was absent from the city (I believe that he paid to have them read publicly) and thus they were always complementary. However other evidence does show that he generally did accomplish when he claimed to have done. For example, he claimed to have sold some 53,000 Adualeui into slavery and independent sources show that the price of slaves in the Mediterranean area dropped to all time lows in the same period, which would tend to demonstrate that there was a large influx of slaves, from somewhere, during this period. -- Cheers, John B. Since you're interested in the period, John B., perhaps you'd like to answer this riddle: The Romans imported enormous amountseeee of wheat from Egypt. What did they export in return in sufficient amounts to pay for all this grain? Andre Jute One of the disadvantages of a classical education is the sheer number of unanswered questions |
#50
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How critical is road bike tire pressure max?
On 4/24/2018 7:13 PM, John B. wrote:
On Tue, 24 Apr 2018 07:51:23 -0700, Joerg wrote: On 2018-04-23 17:48, John B. wrote: [...] The Roman Legions apparently marched for about 2/3rds of a day carrying their gear and weapons - a Century did have several mule carts assigned for carrying tents and other gear - and then built a camp before "falling out" for the night. According to Caesar's reports from Gaul this went on for days at a time. You believe Caesar's writers? I never did. Whenever they got beaten the snot out of them they wrote "the winds were unfavorable" or whatever. If they wrote the truth they'd likely have "disappeared". Caesar was essentially a politician and wrote his reports specifically to keep his name before both the population and the rulers of Rome while he was absent from the city (I believe that he paid to have them read publicly) and thus they were always complementary. However other evidence does show that he generally did accomplish when he claimed to have done. For example, he claimed to have sold some 53,000 Adualeui into slavery and independent sources show that the price of slaves in the Mediterranean area dropped to all time lows in the same period, which would tend to demonstrate that there was a large influx of slaves, from somewhere, during this period. right, then four months ago, this: http://www.dailymail.co.uk/sciencete...ain-found.html -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
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