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#51
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Presta valve in a rim that was drilled for Schrader?
On 9/10/2019 12:51 PM, Joerg wrote:
On 2019-09-09 17:12, Frank Krygowski wrote: On 9/9/2019 7:44 PM, Joerg wrote: On 2019-09-09 15:16, Frank Krygowski wrote: On 9/9/2019 1:33 PM, Joerg wrote: On 2019-09-09 08:15, Tanguy Ortolo wrote: Chalo, 2019-09-09 08:21+0200: I can't imagine what your objection could be, given that Presta valves are inferior in every single possible way to Schraeder valves, except for their diameter.Â* Count your blessings and use a better, less fault-prone tube. I cannot agree with that. The small diameter of Presta valves is one significant advantage, ... Yes, less compromise in the integrity and sturdiness of the rim. Does anyone have an incident where a valve hole caused a failure in a rim? A bike rim is in compression. Other stresses are small, unless one hits a heck of a bump. Which one occasionally does after passing a sign "Pavement Ends" or when it's California roads which often look worse than Romanian roads. Potholes galore. So on those surfaces, how many rims have you seen that failed because of the valve hole? What's the point? You wouldn't believe it anyhow. True. You have a long history of making up macho "Danger! Danger!" stories. -- - Frank Krygowski |
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#52
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Presta valve in a rim that was drilled for Schrader?
On 9/10/2019 10:53 PM, John B. wrote:
On Tue, 10 Sep 2019 19:35:03 -0700, Jeff Liebermann wrote: Yep. The un-capped Schrader valves were just fine until I tried to put some more air into them. It was then that they started leaking. I would guess that the air pushed the mud or dirt into the valve area, which then stuck partly open. However, I didn't do an autopsy on the valve core to be sure. Also, I may have installed the wrong type of Schrader valve core. I had a fairly well mixed assortment at the time[1] and didn't realize that they had different opening pressures: https://www.schrader-pacific.com/media/pdf/Valve%20Core%20Brochure.pdf Perhaps bicycles are more delicate as I do, on occasion, add air to my pickup wheels.... with no problems at all :-) I'm just guessing, but I can envision a truck or car tire being filled at a gas station, and blowing all accumulated debris into the tube, well past the Schrader valve; whereas a bike tire pumped by hand might get the debris lodged in the valve instead. -- - Frank Krygowski |
#53
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Presta valve in a rim that was drilled for Schrader?
On Tue, 10 Sep 2019 23:18:15 -0400, Frank Krygowski
wrote: On 9/10/2019 10:53 PM, John B. wrote: On Tue, 10 Sep 2019 19:35:03 -0700, Jeff Liebermann wrote: Yep. The un-capped Schrader valves were just fine until I tried to put some more air into them. It was then that they started leaking. I would guess that the air pushed the mud or dirt into the valve area, which then stuck partly open. However, I didn't do an autopsy on the valve core to be sure. Also, I may have installed the wrong type of Schrader valve core. I had a fairly well mixed assortment at the time[1] and didn't realize that they had different opening pressures: https://www.schrader-pacific.com/media/pdf/Valve%20Core%20Brochure.pdf Perhaps bicycles are more delicate as I do, on occasion, add air to my pickup wheels.... with no problems at all :-) I'm just guessing, but I can envision a truck or car tire being filled at a gas station, and blowing all accumulated debris into the tube, well past the Schrader valve; whereas a bike tire pumped by hand might get the debris lodged in the valve instead. As I said :-) bicycles are more delicate :-) -- cheers, John B. |
#54
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Presta valve in a rim that was drilled for Schrader?
On 10/09/2019 17:34, Jeff Liebermann wrote:
On Tue, 10 Sep 2019 07:20:33 +0200, Tosspot wrote: https://i.stack.imgur.com/m5vqB.jpg Does anyone know where to order some, I just can't find them! They are my preferred adapter, and come with, I think, Schwalbe tubes. Search for "Panaracer Valve Nut" https://www.ebay.com/sch/i.html?_nkw=Panaracer+Valve+Nut Prices seem to vary from $1/ea to $7/ea. This one seems the cheapest: https://www.ebay.com/itm/283609172914 Oooh you Star! That is a lot cheaper than I was finding. I mean, I was thinking of getting into the business myself as there appears to be a 2,000% markup on the damn things. |
#55
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Presta valve in a rim that was drilled for Schrader?
On Tuesday, September 10, 2019 at 4:19:17 PM UTC-7, Joerg wrote:
On 2019-09-10 15:28, Tom Kunich wrote: On Tuesday, September 10, 2019 at 9:52:59 AM UTC-7, Joerg wrote: On 2019-09-09 17:18, John B. wrote: On Mon, 09 Sep 2019 16:42:12 -0700, Joerg wrote: On 2019-09-09 15:36, John B. wrote: On Mon, 09 Sep 2019 07:24:22 -0700, Joerg wrote: On 2019-09-08 23:21, Chalo wrote: Joerg wrote: Just received a new rear wheel. Despite being 700c and for narrow tires the rim is drilled for a Schrader valve. Couldn't believe it. Harumph, grumble. Why on earth ... well, it is what it is. I can't imagine what your objection could be, given that Presta valves are inferior in every single possible way to Schraeder valves, except for their diameter. Count your blessings and use a better, less fault-prone tube. It confounds me to come up with a rational explanation for why the recent crop of big wide rims (including fatbike rims) are mostly drilled for Presta valves. It's most likely because of standardization. Many small portable pumps cannot or can only with difficulty be converted to Schrader. Doesn't matter to me because I never had a valve failure with either Schrader or Presta. Rummaging around and cleaning the garage in a few spare minutes yesterday I would a mushroom-shaped furniture panel connector made from hollow aluminum. Should be easy to make a nice adapter plug from that and rivet it into the hole. I just have to find a suitable glue to hold it in place. The E6000 I ordered for another purpose (shoe repair) is still more than a week off. Other than holding the adapter in place when changing a tire there is no need to glue it in place as the valve stem will hold it in place quite satisfactorily. That's the main reason, not losing it when changing a tire. It's so easy to forget about that little thing and then I may have to make a new one. I might be able to widen the outside a bit with a punch which would also hold it in place. Sort of a poor man's riveting job. That is more or less what I did. I swedged a flare on one end of a short piece of aluminum tubing stuck it in the hole and flared the outer end just a bit. Given the comparative amounts of time that the tire is inflated and being changed it seems like overkill now :-) It probably is. I never get flats since switching to thick thorn-resistant tubes but I do have to swap rear tires once or twice a year. Bicycle tires just don't last. -- Regards, Joerg http://www.analogconsultants.com/ Last Saturday we went on an easy ride over to Palo Alto. Rather than go to a place I liked over there they went to a place where you had to wait in line for a seat and of course mine was in front of the cooler so I had to keep getting up to allow access. Anyway, on the way back the leader had three flats on thorn-proof tubes. The last one he was out of tubes and he had one tube with a real slow leak and he rode that to BART and pumped it up at the exit and then rode it home from there. That is highly unusual. Did you find out what dunnit? A serious nail would still go through, that would even flatten a car tire. He had been telling us that thorn-proof tubes never get flats. ... I haven't, in years. Funny thing is, I never used any of the patch kits I bought from you on my bikes but I did use them a lot on other rider's bikes. ... When tried on tubeless tires Slime gets really poor ratings so I would expect that putting Finish Line in them yourself would be a better choice. With my tubeless tires I never worry about flats on anything that doesn't destroy the tire. But this being California I have already done exactly that. I remember a couple on the El Dorado Trail. They had tubeless with slime in there. We were all petting some horses when we noticed a hiss. Goat's head thorns had gone through and despite spinning the slime oozing wouldn't stop. It just gurgled out of there. -- Regards, Joerg http://www.analogconsultants.com/ |
#56
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Presta valve in a rim that was drilled for Schrader?
On Tuesday, September 10, 2019 at 4:19:17 PM UTC-7, Joerg wrote:
On 2019-09-10 15:28, Tom Kunich wrote: Last Saturday we went on an easy ride over to Palo Alto. Rather than go to a place I liked over there they went to a place where you had to wait in line for a seat and of course mine was in front of the cooler so I had to keep getting up to allow access. Anyway, on the way back the leader had three flats on thorn-proof tubes. The last one he was out of tubes and he had one tube with a real slow leak and he rode that to BART and pumped it up at the exit and then rode it home from there. That is highly unusual. Did you find out what dunnit? A serious nail would still go through, that would even flatten a car tire. I looked at the tire and couldn't find any place that any puncture happened and there were no signs of slime anywhere. He had been telling us that thorn-proof tubes never get flats. ... I haven't, in years. Funny thing is, I never used any of the patch kits I bought from you on my bikes but I did use them a lot on other rider's bikes. On his other bike he is running sew-ups that he has injected with Slime and says he hasn't gotten a flat on those either. |
#57
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Presta valve in a rim that was drilled for Schrader?
On Tuesday, September 10, 2019 at 5:15:43 PM UTC-7, Jeff Liebermann wrote:
On Tue, 10 Sep 2019 15:18:38 -0700 (PDT), Tom Kunich wrote: On Tuesday, September 10, 2019 at 8:34:17 AM UTC-7, Jeff Liebermann wrote: On Tue, 10 Sep 2019 07:20:33 +0200, Tosspot wrote: https://i.stack.imgur.com/m5vqB.jpg Does anyone know where to order some, I just can't find them! They are my preferred adapter, and come with, I think, Schwalbe tubes. Search for "Panaracer Valve Nut" https://www.ebay.com/sch/i.html?_nkw=Panaracer+Valve+Nut Prices seem to vary from $1/ea to $7/ea. This one seems the cheapest: https://www.ebay.com/itm/283609172914 You would expect those to go for a dollar a dozen and not $10 apiece. The lowest price is 10 for $10. I agree that the prices should be lower, but price would also depend on how you plan to use them: https://www.etsy.com/hk-en/listing/260654137/upcycled-bike-chain-charm-necklace https://www.etsy.com/hk-en/listing/682770659/womens-cycling-gifts-bicycle-jewelry-for Incidentally, these adapter nuts don't appear on the Panaracer web pile: https://www.panaracer.com/lineup/tube_accessory.html which makes me suspect that they may be old stock, counterfeit copies of a discontinued product, or someone just "borrowed" the Panaracer name. Presta Valve Nuts by Jobst Brandt https://www.sheldonbrown.com/brandt/presta-nuts.html Years ago, I converted most of my wheels to Presta on the assumption that they were somehow superior. I wanted to stock one type of spare tube for every size I use, not two. However, after reading Chalo's denunciation of Presta valves, I suspect this may have been a mistake. Indecision is the key to flexibility. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 Well, I tend to believe Andrew but my personal experience is that if you pick up a slow leak, the tire will revolve and tear the tube around the Presta valve. Then the tube is non-repairable. |
#58
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Presta valve in a rim that was drilled for Schrader?
On 9/11/2019 2:25 PM, Tom Kunich wrote:
On Tuesday, September 10, 2019 at 5:15:43 PM UTC-7, Jeff Liebermann wrote: On Tue, 10 Sep 2019 15:18:38 -0700 (PDT), Tom Kunich wrote: On Tuesday, September 10, 2019 at 8:34:17 AM UTC-7, Jeff Liebermann wrote: On Tue, 10 Sep 2019 07:20:33 +0200, Tosspot wrote: https://i.stack.imgur.com/m5vqB.jpg Does anyone know where to order some, I just can't find them! They are my preferred adapter, and come with, I think, Schwalbe tubes. Search for "Panaracer Valve Nut" https://www.ebay.com/sch/i.html?_nkw=Panaracer+Valve+Nut Prices seem to vary from $1/ea to $7/ea. This one seems the cheapest: https://www.ebay.com/itm/283609172914 You would expect those to go for a dollar a dozen and not $10 apiece. The lowest price is 10 for $10. I agree that the prices should be lower, but price would also depend on how you plan to use them: https://www.etsy.com/hk-en/listing/260654137/upcycled-bike-chain-charm-necklace https://www.etsy.com/hk-en/listing/682770659/womens-cycling-gifts-bicycle-jewelry-for Incidentally, these adapter nuts don't appear on the Panaracer web pile: https://www.panaracer.com/lineup/tube_accessory.html which makes me suspect that they may be old stock, counterfeit copies of a discontinued product, or someone just "borrowed" the Panaracer name. Presta Valve Nuts by Jobst Brandt https://www.sheldonbrown.com/brandt/presta-nuts.html Years ago, I converted most of my wheels to Presta on the assumption that they were somehow superior. I wanted to stock one type of spare tube for every size I use, not two. However, after reading Chalo's denunciation of Presta valves, I suspect this may have been a mistake. Indecision is the key to flexibility. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 Well, I tend to believe Andrew but my personal experience is that if you pick up a slow leak, the tire will revolve and tear the tube around the Presta valve. Then the tube is non-repairable. Riding at low pressures shreds valves right out of the tube as the tire creeps along the rim. This is well known and not caused by a 7mm valve in a 9mm hole. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#59
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Presta valve in a rim that was drilled for Schrader?
On 2019-09-11 12:22, Tom Kunich wrote:
On Tuesday, September 10, 2019 at 4:19:17 PM UTC-7, Joerg wrote: On 2019-09-10 15:28, Tom Kunich wrote: Last Saturday we went on an easy ride over to Palo Alto. Rather than go to a place I liked over there they went to a place where you had to wait in line for a seat and of course mine was in front of the cooler so I had to keep getting up to allow access. Anyway, on the way back the leader had three flats on thorn-proof tubes. The last one he was out of tubes and he had one tube with a real slow leak and he rode that to BART and pumped it up at the exit and then rode it home from there. That is highly unusual. Did you find out what dunnit? A serious nail would still go through, that would even flatten a car tire. I looked at the tire and couldn't find any place that any puncture happened and there were no signs of slime anywhere. Thorn-resistant tubes generally do not contan slime unless the cyclist put it in himself. Somehow this sounds like a manufacturing defect. He had been telling us that thorn-proof tubes never get flats. ... I haven't, in years. Funny thing is, I never used any of the patch kits I bought from you on my bikes but I did use them a lot on other rider's bikes. On his other bike he is running sew-ups that he has injected with Slime and says he hasn't gotten a flat on those either. Sew-ups with slime? I can't even imagine how messy that must be when swapping tires. Yuck! -- Regards, Joerg http://www.analogconsultants.com/ |
#60
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Presta valve in a rim that was drilled for Schrader?
On Wednesday, 11 September 2019 16:06:04 UTC-4, Joerg wrote:
On 2019-09-11 12:22, Tom Kunich wrote: Snipped On his other bike he is running sew-ups that he has injected with Slime and says he hasn't gotten a flat on those either. Sew-ups with slime? I can't even imagine how messy that must be when swapping tires. Yuck! -- Regards, Joerg http://www.analogconsultants.com/ And why would it be messy to have slime in a sew-up aka tubular tire when changing tires? The slime is completely inside the tube which is inside an enclosed tire casing. Cheers |
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