Tubular Repair
Moderator: robbosmans
Forum rules
The spirit of this board is to compile and organize wheels and tires related discussions.
If a new wheel tech is released, (say for example, TPU tubes, a brand new tire, or a new rim standard), feel free to start the discussion in the popular "Road". Your topic will eventually be moved here!
The spirit of this board is to compile and organize wheels and tires related discussions.
If a new wheel tech is released, (say for example, TPU tubes, a brand new tire, or a new rim standard), feel free to start the discussion in the popular "Road". Your topic will eventually be moved here!
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- Posts: 35
- Joined: Thu May 25, 2017 7:05 pm
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?
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?
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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?
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
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
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.”
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.
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.
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.
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.”
Yep, it's the valve. I removed and cleaned it. So far so good.
Just bought a pair of cross tubs that had been stored flat with sealant in. Of course one blew up when I tried to inflate it. As they only cost me £20 I thought it was a good opportunity to try and repair it by replacing the tube (http://www.sheldonbrown.com/brandt/tubular-repair.html).
A massive ball ache, but I managed it! Lots and lots of talcum powder seems to be the key
A massive ball ache, but I managed it! Lots and lots of talcum powder seems to be the key
Weight 74.4kg, FTP 303W => 4.04 W/kg
Retired Bikes
Custom 650B Kingdom Double9
Kinesis Aithein / Kinesis Racelight 4S
Current bikes
Reilly Spectre / Cervelo R3
Pivot Les / Pivot Mach4SL
Ventana El Conquistador
Retired Bikes
Custom 650B Kingdom Double9
Kinesis Aithein / Kinesis Racelight 4S
Current bikes
Reilly Spectre / Cervelo R3
Pivot Les / Pivot Mach4SL
Ventana El Conquistador
Anyone ever have a valve stem come clean out of a tube?
Have a Conti comp with loads of thread left and very few nicks in it and the valve starting turning when trying to inflate it and the whole valve stem/neck came clean out of the tube.
Be a real shame to bin it!
Have a Conti comp with loads of thread left and very few nicks in it and the valve starting turning when trying to inflate it and the whole valve stem/neck came clean out of the tube.
Be a real shame to bin it!
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