T On Wednesday, May 15, 2024 at 1:08:28 AM UTC-4 travis...@gmail.com wrote:
> When I wrote that the sizes and weights explained the appeal to "oldez", I > was referring to riders like myself trained by the bicycle press from > adolescence to stop and look -- and even spend, again -- to save some > grams. > > Chis Fly might also have been thinking of the experience of riders saving > less weight than was the promise of "CO2 cartridges will replace pumps", > what with the backup cartridges in case of failure to dispense correctly or > the insufficiency of just one, or two. > > The expected maximum benefit for all the risks of disappointment in TPU > tubes is estimated in tests with measurement repeatability of +- 0.3 > watts, on the order of 2 watts per tire @50psi compared to a thin butyl > tube. Expected benefit compared to the lightweight butyl tube may be no > more than 1 watt per tire , about the energy loss of a tube rubbing inside > your tire. (Latex tubes are grippy.) > > (I apologize that the rightmost original column with average energy losses > in 3 fast 25mm tires @ 60psi would not fit in a screen shot. The lower the > pressure, the greater the expression of between-tube differences.) > > > [image: image0.png] > > > > - -- > Harry P Travis > Portland, OR USA > 17.4.1 > > On May 14, 2024, at 6:03 PM, Chris Fly <four...@gmail.com> wrote: > > > > light weight and a small footprint is all well and good until you are on > the side of the road, tired and blow through your tubes trying to get your > tire seated back on the rim.. these seem way too fragile for me to worry > about the weight difference.. and I'm sorry, but I just can't see the > difference between a good latex and a TPU making that much difference when > riding.. I get the numbers will say the TPU spins up xx% faster from a > stop, etc. but I don't buy that it will make much of a real world > difference.. and, as I said prior, I don't even use a latex tube as a spare > based on how you can bung those up as well on the side of the road.. > > ride what you want to ride for sure, but don't try and sell me on the > advantages of saving 50g (100g for a set) when the total system weight for > me is around 235 lbs.. especially if it sacrifices reliability, which it > seems to do in this case.. > > Chris > > On Tue, May 14, 2024 at 5:43 PM Harry Travis <travis...@gmail.com> wrote: > > A pic to remind of best reason - WL mentioned it early- why these have >> even oldez wanna spend. >> >> these are all tube for nominal 25mm tires. including one 80g latex tube >> and three butyl tubes for nominal and indeed small 25mm tires. >> >> Lightest TPU tubes weighed 20-25g. >> > <image0.jpeg> >> >> -- >> Harry P Travis >> 17.4.1 >> >> On May 14, 2024, at 4:28 PM, Patrick Moore <bert...@gmail.com> wrote: >> >> >> Sheesh; sorry for the bad experiences and, again -- don't hate me for >> this -- thanks for being the bad-news guinea pig. >> >> Let us know if you ever rustle up Rene Herse customer service for refunds >> or replacements. >> >> I use Schwalbe extra light butyls with Orange Seal regular formula in >> road tires (30 to 60 psi, 559 X 42 and 559 X 28, slightly lower psi in >> front than rear) and I am very happy to report that this works well. I >> guess I'll continue to be happy with this arrangement for a while longer. >> >> Everybody: If you experiment with TPUs, please keep the list informed. >> Thanks. >> >> Patrick Moore, who would love to swap 70 gram / 100 gram butyls for 35 >> gram, faster-rolling TPUs with compatible sealant proven against goatheads, >> in ABQ, NM. >> >> On Tue, May 14, 2024 at 5:19 PM Ted Durant <tedd...@gmail.com> wrote: >> >>> Another update. Found my Riv Road (622x32) had an almost flat front tire >>> this afternoon. Pulled the tube and found no holes but a very slow leak >>> from the valve stem. Using my fingers to grip the stem, I was able to back >>> off the core then re-tighten it. The leak was worse. So, I gripped the >>> valve with pliers and again re-tightened the core. As I worried would >>> happen, when I went to reinflate the tube to check for a leak, the tube had >>> broken at the base of the stem. That tire is now inflated by old reliable >>> Schwalbe no 16. Out of the six tubes I bought in that size, I'm down to >>> three usable. I like having removable/replaceable cores, but they're kind >>> of silly on tubes that have such a fragile connection to the valve. >>> >>> The repair I made yesterday (Waterford ST-22, 622x32, rear wheel) didn't >>> work. I pulled the tube again and checked for leaks in water, which I >>> should have done yesterday. I'm not sure whether what I thought was a hole >>> actually was, but I found a tiny hole in the same place relative to the >>> valve stem, the other way around. The hole was so tiny that it was not at >>> all visible - only could find it from the bubbles that came out of it under >>> water. So, that one is patched and reinstalled. >>> >>> I've used Schwalbe superlight tubes on my Breadwinner (584x48) and had >>> mostly good luck with them, though I did get a flat on that bike's maiden >>> voyage. That was a special treat because it was my first experience with >>> rims designed for going tubeless and I didn't know how hard it would be to >>> get the beads off the shelves (and back on again). I'm going to experiment >>> with superlight tubes on my Riv Road, where I think I'll benefit from them. >>> Not sure I'll use them elsewhere. >>> >>> Ted Durant >>> Milwaukee WI USA >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "RBW Owners Bunch" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to rbw-owners-bun...@googlegroups.com. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/rbw-owners-bunch/8b2910ea-336f-4c48-a8a6-5ac7abdbfa18n%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/rbw-owners-bunch/8b2910ea-336f-4c48-a8a6-5ac7abdbfa18n%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> >> >> -- >> >> Patrick Moore >> Alburquerque, Nuevo Mexico, Etats Unis d'Amerique, Orbis Terrarum >> >> ------------------------------------------------------------------------------------------------------- >> >> Executive resumes, LinkedIn profiles, bios, letters, and other writing >> services >> >> >> ------------------------------------------------------------------------------------------------------- >> >> *When thou didst not, savage, k**now thine own meaning,* >> >> *But wouldst gabble like a** thing most brutish,* >> >> *I endowed thy purposes w**ith words that made them known.* >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "RBW Owners Bunch" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/rbw-owners-bunch/Y5KV2I6s9fo/unsubscribe >> . >> To unsubscribe from this group and all its topics, send an email to >> rbw-owners-bun...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/rbw-owners-bunch/CALuTfgs7cD3ZjtLgf91V7%3DSs2iUHHHMVNRDpMSXHXR93mnujrg%40mail.gmail.com >> >> <https://groups.google.com/d/msgid/rbw-owners-bunch/CALuTfgs7cD3ZjtLgf91V7%3DSs2iUHHHMVNRDpMSXHXR93mnujrg%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "RBW Owners Bunch" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/rbw-owners-bunch/Y5KV2I6s9fo/unsubscribe >> . >> To unsubscribe from this group and all its topics, send an email to >> rbw-owners-bun...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/rbw-owners-bunch/89F1F1CB-5AFE-4FE0-AAA7-E64060575DCD%40gmail.com >> >> <https://groups.google.com/d/msgid/rbw-owners-bunch/89F1F1CB-5AFE-4FE0-AAA7-E64060575DCD%40gmail.com?utm_medium=email&utm_source=footer> >> . >> > > > -- > Be the Reason Others Succeed! > > -- > You received this message because you are subscribed to a topic in the > Google Groups "RBW Owners Bunch" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/rbw-owners-bunch/Y5KV2I6s9fo/unsubscribe > . > To unsubscribe from this group and all its topics, send an email to > rbw-owners-bun...@googlegroups.com. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/rbw-owners-bunch/CAJ15Mh%3DiqCDLF_6cJFmxnWMLym3reQzws4sdXgvO7gR_H%3D4wbw%40mail.gmail.com > > <https://groups.google.com/d/msgid/rbw-owners-bunch/CAJ15Mh%3DiqCDLF_6cJFmxnWMLym3reQzws4sdXgvO7gR_H%3D4wbw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. 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