Tubular Repair

Everything about building wheels, glueing tubs, etc.
tharmor
Posts: 394
Joined: Thu Jun 03, 2010 6:20 am

by tharmor

My Veloflex arenberg rear tire is leaking all along a 5cm stretch of the sidewall where the tire meets the carbon rim. It bubbles right at the contact point of tire and rim. I am running pitstop from the first day of use. It holds pressure for a few hours but eventually goes completely flat.

Any suggestions?

Cheers in advance!

11.4
Posts: 1106
Joined: Tue May 23, 2006 4:33 am

by 11.4

tharmor wrote:My Veloflex arenberg rear tire is leaking all along a 5cm stretch of the sidewall where the tire meets the carbon rim. It bubbles right at the contact point of tire and rim. I am running pitstop from the first day of use. It holds pressure for a few hours but eventually goes completely flat.

Any suggestions?

Cheers in advance!


It's probably just a point leak. The air spreads inside the tubular casing and creates the broad based fizzing that you see. Try pinching the tire in half at a few points to try to isolate the area where the puncture is actually located. Sometimes these aren't really repairable so you have to replace the whole tube or send it to Tire Alert.

fdegrove
Tubbie Guru
Posts: 5858
Joined: Tue May 03, 2005 2:20 am
Location: Belgium

by fdegrove

Hi,

Quite often I've found Pittstop not to be very effective in repairing inner tubes. If I have to resort to a latex based solution then I mostly rely on Tufo Extreme which works well for me.

Do keep that tubular inflated or it will stick together and watch out for clogging of the valve.

Cheers, ;)
Being a snob is an expensive hobby.

1415chris
Posts: 1078
Joined: Sat Apr 18, 2009 8:59 am
Location: Surrey UK

by 1415chris

You must have a small leakage in the inner tube. A bit longer stretch on which you can observe the bubbles its just the way the sealant is finding the way to go out of the tub.
I'm not big fun of Pitstop, tried few times, didn't work. I'm pretty sure that with this kind of small puncture Stan's Notubes and many other sealants would be 100% successful.

Shmitt
Posts: 56
Joined: Tue Mar 22, 2016 1:52 pm

by Shmitt

It is safe to use Tufo Extreme sealant with C02 inflator?

Jman
Posts: 84
Joined: Wed Jan 20, 2010 3:17 pm

by Jman

Shmitt wrote:It is safe to use Tufo Extreme sealant with C02 inflator?


Yes. I have used several times with no problems.

Mep
Posts: 275
Joined: Fri May 28, 2004 4:11 pm

by Mep

First time with tubulars, could really use some advice here. I pulled off a Vittoria tire from my wheel and am looking to reglue it. Base tape has no rips but it is scuffed/stretched from me prying the tire off with plastic levers. It seems very uneven with gobs of dried glue and carbon fragments. I can probably peel off the bigger chunks of glue, but is it OK to reuse without replacing the base tape?

I'm slightly worried about getting an uneven bumpy ride from the old base tape. Also I plan on using it with Effetto Mariposa tape instead of glue, not sure if mixing old glue + new tape causes other issues.

MikeyBE
Posts: 243
Joined: Wed Jul 30, 2014 6:59 pm

by MikeyBE

Hi folks. Got my first puncture on tubs. Am running a Vittoria Pave tub and have a slow leak - managed to limp home on it (kept topping up every 2kms or so). I'm gonna try sealant to repair it - just wondering what the consensus is for best sealant.

Do I go Tufo Extreme or Caffelatex?

Cheers

sungod
Posts: 1539
Joined: Fri Dec 24, 2010 9:37 pm
Location: it's raining, it must be uk

by sungod

Mep wrote:First time with tubulars, could really use some advice here.
[snip]


you don't replace the base tape. if it's detached from the tyre at any point just glue it back down (barge cement or similar adhesive works well)

carbon fragments!!! maybe be more gentle next time :)

easing the tub to the side and rolling it off is kinder than pulling up off the rim

i use just one lezyne 'matrix' lever, plastic, blunt end that can be worked between tape and rim, work it under the tub, then use it to lever off sideways until there's enough free to grab and pull off to the side

you can just pick off any large lumps of glue, i don't use tape but putting old possibly loose glue onto it seems unwise

just put one coat on the tub, this'll help soften and smooth any lumps, let it dry, another coat on the rim, wait a few minutes and mount it

Mep
Posts: 275
Joined: Fri May 28, 2004 4:11 pm

by Mep

sungod wrote:
Mep wrote:First time with tubulars, could really use some advice here.
[snip]


you don't replace the base tape. if it's detached from the tyre at any point just glue it back down (barge cement or similar adhesive works well)

carbon fragments!!! maybe be more gentle next time :)

easing the tub to the side and rolling it off is kinder than pulling up off the rim

i use just one lezyne 'matrix' lever, plastic, blunt end that can be worked between tape and rim, work it under the tub, then use it to lever off sideways until there's enough free to grab and pull off to the side

you can just pick off any large lumps of glue, i don't use tape but putting old possibly loose glue onto it seems unwise

just put one coat on the tub, this'll help soften and smooth any lumps, let it dry, another coat on the rim, wait a few minutes and mount it

Good advice. I was hoping to use tape because I'm new to the whole gluing business but that may not be so wise.

Sent from my HTC One_M8 using Tapatalk

sungod
Posts: 1539
Joined: Fri Dec 24, 2010 9:37 pm
Location: it's raining, it must be uk

by sungod

MikeyBE wrote:Hi folks. Got my first puncture on tubs. Am running a Vittoria Pave tub and have a slow leak - managed to limp home on it (kept topping up every 2kms or so). I'm gonna try sealant to repair it - just wondering what the consensus is for best sealant.

Do I go Tufo Extreme or Caffelatex?

Cheers


of the two i've only tried the tufo, always had good results with it

whatever you do keep the tyre inflated after it's got sealant in, even a few hours deflated can cause the sealant to stick the collapsed tube to itself, if that happens you'll need to replace the tube or bin the tyre

MikeyBE
Posts: 243
Joined: Wed Jul 30, 2014 6:59 pm

by MikeyBE

sungod wrote:
MikeyBE wrote:Hi folks. Got my first puncture on tubs. Am running a Vittoria Pave tub and have a slow leak - managed to limp home on it (kept topping up every 2kms or so). I'm gonna try sealant to repair it - just wondering what the consensus is for best sealant.

Do I go Tufo Extreme or Caffelatex?

Cheers


of the two i've only tried the tufo, always had good results with it

whatever you do keep the tyre inflated after it's got sealant in, even a few hours deflated can cause the sealant to stick the collapsed tube to itself, if that happens you'll need to replace the tube or bin the tyre


Cheers! Hm this could be problematic... I often travel and I can be away for a couple of weeks...

sungod
Posts: 1539
Joined: Fri Dec 24, 2010 9:37 pm
Location: it's raining, it must be uk

by sungod

inflate to max before you go, leave the bike/wheels hanging up so that there's nothing to compress the tyres

once sealant has coated the latex tubes they don't lose pressure quite as fast, but even without that there'll be enough residual pressure to stop the tube collapsing

Wormiez
Posts: 59
Joined: Sat Oct 01, 2016 12:46 am

by Wormiez

An odd question, would their be an expiry date on the applied glue for how long you can safely run them for?

Say you swap between a few set of tubular wheels, one set doesn't get used for a couple of seasons, and you decide to use it next season. Would you swap out the tubular with a newer one or reapply the glue?

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dj97223
Posts: 663
Joined: Sun Nov 06, 2005 7:27 pm

by dj97223

This is not really a repair question, but I think the only way to know if the glue job is still sufficient is the "thumbs" test. Deflate the tire, use your thumbs try to push the tire away from the rim edge. If there are obvious gaps between tire and rim at any point, it is time to remove and re-glue.
“If you save your breath I feel a man like you can manage it. And if you don't manage it, you'll die. Only slowly, very slowly, old friend.”

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