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 Post subject: Re: Tubular Repair
PostPosted: Tue Aug 15, 2017 1:33 pm 
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Joined: Thu May 25, 2017 7:05 pm
Posts: 13
Thanks sungod - very grateful.


Was looking for some advice as I noticed that a chunk had been taken out of one of my tubs (see below).

I've absolutely no idea how it happened, and have now replaced it, but I'm curious as to how it happened so it hopefully never happens again.

Does anyone have any thoughts at all?

Image


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 Post subject: Re: Tubular Repair
Posted: Tue Aug 15, 2017 1:33 pm 


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 Post subject: Re: Tubular Repair
PostPosted: Tue Aug 15, 2017 4:53 pm 
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Joined: Fri Dec 24, 2010 9:37 pm
Posts: 1354
Location: it's raining, it must be uk
i've had that a couple of times with a momentary lock-up of the wheel, both times it happened when braking hard and then hitting a patch of grit/dirt on the road


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 Post subject: Re: Tubular Repair
PostPosted: Tue Aug 15, 2017 9:14 pm 
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Joined: Thu May 25, 2017 7:05 pm
Posts: 13
Brilliant thanks mate


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 Post subject: Re: Tubular Repair
PostPosted: Thu Aug 17, 2017 10:49 am 
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Joined: Sun Feb 23, 2014 7:58 pm
Posts: 215
Location: Istanbul, TR
In last 2 days, my rear Veloflex Roubaix tire lose air after hard descends. I thought it was a puncture on the first time and used Vittoria Pitstop but it went flat in like 20 minutes again. Luckily I've arrived home at that time. I tightened valve extender and shook the tire a bit and it was back to normal. Today it happened again. There seems to be no puncture as there's no sealant leak visible. Any ideas?

_________________
Amaro Loren
Colnago C60 -Done and dusted-
Cannondale SuperSix Evo -Sold-


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 Post subject: Re: Tubular Repair
PostPosted: Thu Aug 17, 2017 11:17 am 
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Joined: Fri Dec 24, 2010 9:37 pm
Posts: 1354
Location: it's raining, it must be uk
i never found pitstop any use as all

have you tried putting a bit of ptfe tape on the threads of the extender?

now that you have sealant in the tube, you need to work very fast once it is deflated as otherwise the tube may stick to itself and then tear apart when re-inflated


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 Post subject: Re: Tubular Repair
PostPosted: Thu Aug 17, 2017 12:01 pm 
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Joined: Sun Nov 06, 2005 7:27 pm
Posts: 642
I've had good experience with PitStop but, like other sealants, it won't fix everything. And I haven't had the dreaded tube sticking to itself. You could try a little orange seal, but first try to locate the source of the leak (inflate and dip in a shallow tub of water) to see whether the problem is the tire or the valve.

_________________
“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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 Post subject: Re: Tubular Repair
PostPosted: Thu Aug 17, 2017 12:53 pm 
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Joined: Sat Apr 18, 2009 8:59 am
Posts: 1004
Location: Surrey UK
Very tiny puncture, when the air is leaking slowly from the tub, may not give you obvious sings.
I had one in Veloflex Carbon. Even with the sealant it re-opened itself on one or two occasions after the period when the tubs were not in use.
If you use valve extenders with removable core (if not, strongly recommend start using) you have more chance with normal sealant like No-tubes, Orange (have a good experience with both) than with the Pitstop (applied twice, failed twice). In the era of Co2 pumps there is no advantage of having sealant in pressurized canister, especially if its effectiveness is very questionable.

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Cervelo S5
Cervelo R5 VWD 5637g/12.43lb
Pronghorn XC SW Race 8284g/18.26lb


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 Post subject: Re: Tubular Repair
PostPosted: Fri Aug 18, 2017 5:33 pm 
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Joined: Sun Feb 23, 2014 7:58 pm
Posts: 215
Location: Istanbul, TR
Thank you guys. I was on holiday so couldn't do more than just pumping. I'm back home now. I'll investigate and report back.

_________________
Amaro Loren
Colnago C60 -Done and dusted-
Cannondale SuperSix Evo -Sold-


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 Post subject: Re: Tubular Repair
PostPosted: Fri Aug 18, 2017 5:54 pm 
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Joined: Fri Dec 24, 2010 9:37 pm
Posts: 1354
Location: it's raining, it must be uk
btw another thing i've seen... when sealant gets in a presta valve, it can actually clog it so that it does not close fully unless manually tightened


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 Post subject: Re: Tubular Repair
PostPosted: Fri Aug 18, 2017 10:43 pm 
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Joined: Sun Nov 06, 2005 7:27 pm
Posts: 642
Yes, Orange Seal can do a number on the valves and cores, and I suspect other sealants can cause the same problem. I think the clogging can be largely avoided by storing the wheels with the valves sitting at 4:00 or 8:00.

_________________
“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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 Post subject: Re: Tubular Repair
PostPosted: Sun Aug 27, 2017 5:23 pm 
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Joined: Sun Feb 23, 2014 7:58 pm
Posts: 215
Location: Istanbul, TR
Yep, it's the valve. I removed and cleaned it. So far so good.

_________________
Amaro Loren
Colnago C60 -Done and dusted-
Cannondale SuperSix Evo -Sold-


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 Post subject: Re: Tubular Repair
PostPosted: Sun Nov 19, 2017 3:28 am 
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Joined: Mon Feb 20, 2017 4:14 pm
Posts: 8
man just when i though i have tubeless tires maintenance under control you learn something new.

i have this happen to me recently too. thanks


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