Tubular Repair

Everything about building wheels, glueing tubs, etc.
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LeDuke
Posts: 1180
Joined: Sun Oct 07, 2012 2:39 am
Location: Front Range, CO

by LeDuke

I have a pair of once-used Challenge CX tubs. Like, warmed up on road tires, did a couple of laps, raced for 45min. The tread is coming off in a couple of places.

Anyone have a good recommendation for what I can use to re-glue the tread? As it's a CX tub, I'd like it to be soft and supple still.

sungod
Posts: 1555
Joined: Fri Dec 24, 2010 9:37 pm
Location: it's raining, it must be uk

by sungod

there's an article about fixing tread here...

https://www.bikeman.com/bicycle-repair- ... ead-repair

by Weenie


bcmf
Posts: 64
Joined: Fri May 22, 2009 5:00 pm

by bcmf

Got a quick question for you.
I dug out a flat tub , Vittoria Pave 25c, to have a look at either sending it to tire alert - not an option as postage is too expensive- or fixing.

I pumped it up a little and found where the air was coming out.
When I looked closer it turns out the tyre casing is torn just outside the basetape and I can see the tube.
There was less then 200 km on the tub.
Where the outer casing is torn would be still on the glue on the rim.

Is this for the bin? Or is it worth trying to fix?
TIA

sungod
Posts: 1555
Joined: Fri Dec 24, 2010 9:37 pm
Location: it's raining, it must be uk

by sungod

depends how big the cut/tear is

with veloflex i patch it with a piece of carcass from an old tyre, about 15-20mm (cut it oval shape)

glue it to the inside with barge cement (or another durable contact adhesive), finish the rest of the repair and sew up, before gluing the basetape, put tyre on a rim and inflate to max pressure, if there's no sign of a bulge it's fine

i've done this for cuts c. 5mm with no problem

bcmf
Posts: 64
Joined: Fri May 22, 2009 5:00 pm

by bcmf

Thanks.
Ah it wouldnt be bigger then 5mm.
Better gets some waxed dental floss etc.
Have a few old tyres that can be sacrifriced for a patch.

sungod
Posts: 1555
Joined: Fri Dec 24, 2010 9:37 pm
Location: it's raining, it must be uk

by sungod

fwiw i use dacron line for sewing them, 20lb - 30lb rated, you can get a reel for a few quid/dollars/euros

it's sold as 'backing line' by angling equipment suppliers, available in bright colours, which helps old eyes see where the stitches are!

dntong
Posts: 13
Joined: Fri Nov 20, 2015 11:04 pm

by dntong

Does anybody have a link to youtube vid showing how to repair a tubular tire? About to transition for the first time, and wanted to be prepared when a flat does happen.

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

by fdegrove

Hi,

No idea about youtube other than a lot of non sense but basically you want to use a X type of sewing.
All of which is explained already in this thread.

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

bm0p700f
in the industry
Posts: 3706
Joined: Sat May 12, 2012 7:25 pm
Location: Glermsford, Suffolk U.K
Contact:

by bm0p700f

What do you guys use to fill ghe cut in the carcass. Would wet suit repair glue work well or is there better.

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

by fdegrove

Hi,

[quote][/Would wet suit repair glue work well or is there better.quote]

Should work as it contains polyurethane. In general I can't be bothered with these small cuts though.
The ones on the sides of the envelope are the ones I worry about but there's much you can do about those anyhow short of coating them with liquid latex on a regular basis.

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

fabriciom
Posts: 126
Joined: Mon Aug 31, 2015 8:42 pm
Location: Madrid, España

by fabriciom

Tried my fist tube repair on a continental sprinter and this morning at 7 am the tyre blew up and it woke me up.
It seemed like a simple job but I guess I made a mistake some where.
Next time I won't glue until I live it out with air for at least 1 day on the tyre stretching.

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jekyll man
Posts: 1366
Joined: Wed Apr 25, 2007 10:23 am
Location: Pack filler

by jekyll man

fabriciom wrote:Tried my fist tube repair on a continental sprinter and this morning at 7 am the tyre blew up and it woke me up.
It seemed like a simple job but I guess I made a mistake some where.
Next time I won't glue until I live it out with air for at least 1 day on the tyre stretching.


The good thing about conti tubs is, they're strong enough, and easy enough to repair.

Pull it to bits and have another go. Either you didn't repair the puncture itself well enough, or sounds more likely that your sewing wasn't tight enough, and allowed the inner tube to poke through like a hernia.
Official cafe stop tester

fabriciom
Posts: 126
Joined: Mon Aug 31, 2015 8:42 pm
Location: Madrid, España

by fabriciom

I think it was the string I used wasn't strong enough.

The inner tube is destroyed not way to repair.

sungod
Posts: 1555
Joined: Fri Dec 24, 2010 9:37 pm
Location: it's raining, it must be uk

by sungod

you can replace the inner tube with a new (latex) one, there's some info in this thread, also outside ww...

http://www.sheldonbrown.com/brandt/tubular-repair.html
http://www.bikeforums.net/classic-vinta ... ement.html

by Weenie


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

by fdegrove

Hi,

fabriciom wrote:I think it was the string I used wasn't strong enough.

The inner tube is destroyed not way to repair.


I suggest using high quality dental floss a la Johnson & Johnson which can be found at the local pharmacy in most European and American countries.
Bottom line, strong, silk, waxed and no stretching.

Anything else is mostly down to sewing practice.

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

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