On Apr 24, 2020, at 4:08 PM, Bill Lindsay <tape...@gmail.com> wrote:
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Cross section of a tubular (aka "sew-up") tire. Note tube in green.
-- Steve Palincsar Alexandria, Virginia USA
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Bill L, that's a nice Roadeo, even nicer with the new wheels. Bill S, thanks for these apercus, and I welcome your enthusiasm; I think exalte's are nice people!It won't be this year, since the very long-maturing 3-speed road bike project is now under way and my money and time will be spent sorting that one out, but I do very much want to resurrect my old Libertas (60 X 56 c-c, exactly my size in level top tubes, and 5.9 lb f + f with steel campy headset!), and at just-turned-65, I believe I must commit to riding top-line tubulars before I die. It's good to hear that they ride so well, and I am looking forward -- into the distance -- to eventually riding them.Bill S: I was very pleased to hear that a few goatheads didn't result in leaks even without sealant. I've had this happen with very stout tires, Big Apples, but not with light tires; so does one say that the thorns didn't penetrate the latex tubes, or that the thorns did penetrate but the latex kept close around them and blocked leakage?
Another question: One PITA of riding tubes filled with sealant is getting a puncture that the sealant doesn't seal. You are left with a casing full of spludge, which of course splatters all over you and the nearby landscape when you remove the tube. (I carry a rag precisely to wipe up such messes.)*
Thus, when you have a tire where the tube is sewn up inside the casing, and you get a puncture that the sealant doesn't seal -- doesn't the sealant leak out into the casing? And when casing is sewn shut over tube -- what then? I'd imagine you have a plus-que-bloody mess, right?
And more than this, when you go to remove the punctured tube, at least in my clincher experience, the ongoing minor leakage as the sealant takes its time to seal recurrent punctures means that you are faced, when time comes to remove the tube, with a tube that is firmly glued to the inside of the casing. Does this happen with tubulars, or are tube and casing so tightly pressed that the sealant can't get out and roam around inside the tire, so that leakage is minimal?
My remarks bear on sealants even more than on tubulars, but my principal interest is whether sealants make tubulars viable. List traffic seems to weigh "pro." I'd be interested in hearing more from others who ride top line tubulars in goat head areas.
My experience is definitely positive. I'm PRO! I have read that others have had less satisfactory results. I think some inject sealant as a preventative measure. I wait for a puncture first before I use sealant. I have zero personal experience with tubeless but I figure if sealant works for tubeless so well, why not in a tube too? So far, so good.
*(I think that my recent problems of sealant not sealing is because I've been using Orange Seal Endurance -- skim milk version -- in my tubes, not the full cream version -- "regular." OS Endurance works very well in my fat, thinwall, low pressure Big Ones, but I've just switched back to regular for tubes and, sample size of 1 ride, all well -- after 2 consecutive rides of OSE and flats and mess. -- All in all, even the best sealants are nasty, messy PITAs. I was struggling with the crust built up around the underside of the bb and lower dt on the Matthews just now -- practically ineradicable. But they allow nice tires in thorn country, so I quietly offer it up.)
On Sat, Apr 25, 2020 at 5:48 PM Bill Schairer <comm...@gmail.com> wrote:
Also being a Bill, I’ll volunteer my answer to Ted’s question. I have two sets of the Vlaanderen tires, each set with about 1800 miles times 4 gives me about 7200 tire miles? I have had one puncture too large for sealant -glass cut. The tire was at about the rated mileage limit and well worn but, unlike Bill L, I had no previous experience repairing tubulars so doing the repair was my opportunity for a learning experience. REMA patch and glue worked and the tire is still in service. All other punctures (not sure how many but not a lot) have been fixed with sealant. I’ve opted to ride with 2 spares and save sealant injections for home. I’ve changed exactly one tire on the road, the aforementioned flat. All other punctures were slow enough that I got home or they sealed from previously administered sealant. So far, I’ve come to the conclusion that latex tubes are more puncture resistant than butyl and leak more slowly when punctured. I’ve also pulled 3 goat heads out of tires with no sealant without any resulting loss of pressure. I don’t think I can ever remember doing that with a clincher.
I also did a complete tube replacement on a used FMB tire that I acquired with a leak. That involved cutting a new $15 tube in half, pulling it through and gluing it back together. Probably got the instructions on that from Sheldon Brown. It took a long time but, again, this was a learning experience. That tire has about 90 of my miles on it. Not the greatest repair job - a little lumpy - but definitely worth it.
I am also puzzled by a couple comments I’ve seen regarding these tires being for “roadies.” I don’t consider myself a roadie - never raced - always been a commuter, tourer and now recreational rider too. I’ve ridden my tubulars on and off road and will ride them under any conditions I would ride a clincher. Besides that, I believe many cyclocross racers use tubulars and I shouldn’t think they are roadies. Just saying.
I apologize as I know I have a tendency to get carried away with my enthusiasm but reading the positive experiences of others who debunked the notion that tubulars are something exotic not worth the trouble finally pushed me to give them a try. I mean, there are similar discussions regarding tubeless? Besides, the more people who will give them a shot, the better chance we will get or keep more choices. I highly recommend them for anyone who enjoys working on their bicycles. If somebody else does all your work, maybe not the right choice.
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I've always been fascinated by roadies hardcore enough to ride tubulars and doing the patching/sewing job on flats. I don't have a clue how they do it, but it's cool!
Re: association of tubulars with "roadies"
. These days I don't know what a typical tubular rider would be except perhaps a professional racer.
I haven't had to pull and patch a tubular since I switched to sealant for punctures in the field (2012). That makes a tub flat repair faster than a clincher one assuming you find the nidus of failure in either case.
The big downside is the profound shortage of tires in the 28-32mm range with road treads. If you ride with heavy loads, a 27 will require too much pressure to be fun/compliant/puncture resistant in my experience, but I am no lightweight at 14-15stone depending on the season.
Anyway, your mileage and experiences will vary. Enjoy the ride!
Best Regards,
Will
William M deRosset
Fort Collins CO USA
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Tube Replacement
To replace the entire tube, open the tire on one side of the stem, the side that seems to be easier to re-sew after the repair. Open about eight to ten cm the usual way, so that the old tube can be pulled out by the stem. Cut the tube and attach a strong cord to the loose end of the tube to be pulled through the casing by the old tube as you pull it out.
Cut the "new" latex tube about 8-10 cm away from the stem, tie the cord onto the loose end and pull it gently into the casing. Dumping some talc into the casing and putting talc onto the tube help get the tube into place. With the tube in place, pull enough of it out by stretching it, to splice the ends together.
Splicing the Tube
This procedure works only with latex tubes. Overlap the tube ends so the free end goes about one cm inside the end with the stem. With the tube overlapped, use a toothpick to wipe Pastali rim cement into the interface. The reason this MUST be done in place is that the solvent will curl the rubber into an unmanageable mess if you try this in free space. Carefully glue the entire circumference and press the joint together by pressing the tube flat in opposing directions. Wait a minute and then gently inflate to check the results. More glue can be inserted if necessary if you do not wait too long.
Bill S
Hi, All,
Old. Tubular users are all old because nobody younger than I am (50's) learned to use them and stuck with them long enough for the hassle factor to get manageable. Or they're professional racers with old DS's.
Best Regards,
Will
William M. deRosset
Firt Collins CO USA