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-   -   Totally Tubular (https://www.bikeforums.net/showthread.php?t=154679)

L134 02-29-24 09:08 AM


Originally Posted by pastorbobnlnh (Post 23170735)
I just checked the pressure after a 20 hour wait. It dropped from 100psi to just below 20psi. So not the valve core. :(

I'll try to find time today to pull the wheel off, dunk in water to see if a leak is detectable and will add sealant. The current condition of the tread and sidewall doesn't merit a full-blown repair. This tire has given me nine years of use with no issues until now. Tubular life is good!

Another low risk attempt might be to replace the 9 year old core with a new one?

seagrade 02-29-24 11:46 PM

https://cimg5.ibsrv.net/gimg/bikefor...29d4833d7.jpeg

Couldn’t possibly use anything other than an Italian-made engraver/scriber for keying the tyre bed of my Record Pave rims. Always scribed parallel lines on new rims back in the 80s/90s and never should have neglected that step last year when sandpaper didn’t scratch the surface…

Classtime 03-01-24 06:56 AM

^The Horror!

pastorbobnlnh 03-01-24 08:32 AM

Final report on my very slow leaking Schwalbe One tubular:

Sealant took care of the leak. :D The tire was still holding at 100psi this morning after adding Effetto Mariposa Caffelatex sealant yesterday morning and pumping to the same. Now I just have to ride the Paramount every week to keep the sealant from pooling at the bottom and hardening.

MooneyBloke 03-01-24 11:51 AM


Originally Posted by L134 (Post 23169837)
First, make sure the valve core is tight. If that doesn't do it, sealant. I've not had good luck locating a puncture by putting tire in water as the bubbles are really only indicating where the air is escaping from the casing and that may not coincide with where it is escaping the tube.

Interesting. In four decades on sew-ups both garbage and excellent, I've never seen displaced bubbles if the tire is in good shape. The path of least resistance is through the puncture or at least very close. I do pinch the tire to look for tread cuts in the area to be doubly sure though.

MooneyBloke 03-01-24 11:54 AM


Originally Posted by SJX426 (Post 23170016)
Stick it in water to find the leak. Although I haven't seen a leaky stem, it is worth checking out.
i have seen some slow leaks from punctures that required digging in the tread. Here is an example:

A small vessel of water and dish soap is even better I think. You brush it on generously, and where the air escapes, there is a large and obvious bubble.

MooneyBloke 03-01-24 11:56 AM


Originally Posted by pastorbobnlnh (Post 23170735)
This tire has given me nine years of use with no issues until now. Tubular life is good!

Nine years?!?!?!?! You're not riding that nearly enough. You should eat a tire in no more than two seasons. ;)

L134 03-01-24 04:13 PM


Originally Posted by MooneyBloke (Post 23171869)
Interesting. In four decades on sew-ups both garbage and excellent, I've never seen a displaced bubbles if the tire is in good shape. The path of least resistance is through the puncture or at least very close. I do pinch the tire to look for tread cuts in the area to be doubly sure though.

I will defer to your far greater experience. Perhaps I had one bad experience and never went back. I do have a tire right now that I could have another go at it with.

gaucho777 03-04-24 06:35 PM


Originally Posted by MooneyBloke (Post 23171869)
Interesting. In four decades on sew-ups both garbage and excellent, I've never seen displaced bubbles if the tire is in good shape. The path of least resistance is through the puncture or at least very close. I do pinch the tire to look for tread cuts in the area to be doubly sure though.

I've been riding tubulars since the 80s and I have also experienced what @L134 is describing. Not often, but more than a couple times. I have submerged a tubular to find small bubbles emanating from a general area of the sidewall (say a few inches long), and not always exactly where the puncture is. This seems to me more likely with a well-used tubular, especially when the sidewall has been scuffed in a particular area. Some people apply a sealant such on the sidewalls (I use barge cement on the sidewalls of my Dugast cyclocross tubulars) which might also affect where the bubbles exit. I've also experienced air coming out from the casing in the gap around the valve only to find--after peeling back the base tape and opening up the casing--that the puncture is not at the valve. :notamused:

MooneyBloke 03-04-24 09:02 PM


Originally Posted by gaucho777 (Post 23175114)
I've been riding tubulars since the 80s and I have also experienced what @L134 is describing. Not often, but more than a couple times. I have submerged a tubular to find small bubbles emanating from a general area of the sidewall (say a few inches long),

A dried out casing may indeed give a false indication, but I try to touch up areas like that with latex emulsion because the bare casing is more prone to abrasion damage. In any case, pinching the tread around the bubbles should give you an idea where the damage lies.

Valve hole bubbling might indeed be displaced, but when I've had that, it was leading to an irreparable failure of the stem on some Vitt CXes.

obrentharris 03-06-24 09:47 AM


Originally Posted by MooneyBloke (Post 23175226)
A dried out casing may indeed give a false indication, but I try to touch up areas like that with latex emulsion because the bare casing is more prone to abrasion damage. In any case, pinching the tread around the bubbles should give you an idea where the damage lies.

Please share your source for liquid latex. In decades gone by I used the Jevelot product which came in a small jar that was good for many applications. Alas, Jevelot and Hugh Enochs are no more. I'd appreciate any lead on a substitute. I tried using tire sealant but it didn't adhere as well as my memory of the Jevelot product.
Brent

MooneyBloke 03-06-24 10:34 AM


Originally Posted by obrentharris (Post 23176460)
Please share your source for liquid latex. In decades gone by I used the Jevelot product which came in a small jar that was good for many applications. Alas, Jevelot and Hugh Enochs are no more. I'd appreciate any lead on a substitute. I tried using tire sealant but it didn't adhere as well as my memory of the Jevelot product.
Brent

The stuff I use is Val-A Tear Mender which is a light natural latex emulsion much like the Tire Life product.
I also use this to stick the base tape back down after restitching cotton sew-ups. The main issue with either of these is the rather short shelf life once opened; in my experience, the rubber tends to fall out of suspension over time. Evidently carpet layers use some sort of latex emulsion as well, but I've not had any experience here. If you investigate this and can let me know of a good brand, I'd be very interested especially if it's cheaper than the Tear Mender.

Let me state loudly that I've never found a good base tape repair adhesive for Conti Sprinters. Those seem to be a one-and-done tire unless you like riding on dicey base tape.

pastorbobnlnh 03-06-24 05:31 PM

I finally had a chance to test-ride my sealant filled Schwalbe One tubular. 20 miles and no air loss! The ride also gave me a chance to check the road worthiness of the leather handlebar bag I just completed. More on the new bag can be found in the DIY Bag thread.
https://cimg1.ibsrv.net/gimg/bikefor...637e8af6eb.jpg
As mounted on my '71 P13 Paramount with other leather projects.

smontanaro 03-06-24 06:26 PM


Originally Posted by pastorbobnlnh (Post 23176910)
More on the new bag can be found in the DIY Bag thread.

This was news to me. I couldn't find it with a few searches. Got a link?

pastorbobnlnh 03-06-24 06:56 PM


Originally Posted by smontanaro (Post 23176955)
This was news to me. I couldn't find it with a few searches. Got a link?

DYI bag making thread.

JohnDThompson 03-07-24 08:42 AM


Originally Posted by obrentharris (Post 23176460)
Please share your source for liquid latex. In decades gone by I used the Jevelot product which came in a small jar that was good for many applications. Alas, Jevelot and Hugh Enochs are no more. I'd appreciate any lead on a substitute. I tried using tire sealant but it didn't adhere as well as my memory of the Jevelot product.
Brent

Here's one option:
https://m.media-amazon.com/images/I/...L._SL1500_.jpg
https://www.amazon.com/Liquid-Latex-...r_1_18?sr=8-18

MooneyBloke 03-07-24 05:38 PM

I suspect theatrical makeup latex would bit a bit too thick much like mold makers latex.

Biker Pete 03-07-24 06:38 PM

Hey, sorry, this question is probably answered somewhere in this long thread, but are 22-23mm silk tubular tires with latex inner tubes for the road still being made? I’m in the US. Thanks in advance.

seagrade 03-07-24 08:39 PM


Originally Posted by Biker Pete (Post 23178004)
Hey, sorry, this question is probably answered somewhere in this long thread, but are 22-23mm silk tubular tires with latex inner tubes for the road still being made? I’m in the US. Thanks in advance.

Available direct from FMB in France…

https://fm-boyaux.cc/en/route/28-82-.../36-largeur-22

No affiliation.

Biker Pete 03-08-24 07:43 AM


Originally Posted by seagrade (Post 23178105)
Available direct from FMB in France…

https://fm-boyaux.cc/en/route/28-82-.../36-largeur-22

No affiliation.

Excellent…….thanks!

squirtdad 03-12-24 12:56 PM


Originally Posted by Biker Pete (Post 23178004)
Hey, sorry, this question is probably answered somewhere in this long thread, but are 22-23mm silk tubular tires with latex inner tubes for the road still being made? I’m in the US. Thanks in advance.

rene herse has fmb https://www.renehersecycles.com/shop...-700c-x-23-mm/

Biker Pete 03-13-24 04:55 PM


Originally Posted by squirtdad (Post 23182434)

Thank you!

Biker Pete 03-23-24 02:36 PM


Originally Posted by seagrade (Post 23178105)
Available direct from FMB in France…

https://fm-boyaux.cc/en/route/28-82-.../36-largeur-22

No affiliation.

Got them, I’ll install them soon!

Biker Pete 03-31-24 07:31 AM


Originally Posted by seagrade (Post 23178105)
Available direct from FMB in France…

https://fm-boyaux.cc/en/route/28-82-.../36-largeur-22

No affiliation.

I read on the FMB and René Herse websites that these tires are hand made in a small shop in Brittany, France. Yet on the tires I received directly from FMB there is embossed an inscription in English: “Made in Thailand”. Hmmm.

https://cimg6.ibsrv.net/gimg/bikefor...64089f7ef.jpeg

Classtime 03-31-24 02:11 PM

Just the tread?


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