winjim
Smash the cistern
I'm now imagining a room full of Italian grandmothers sitting around sewing up tyres, gossiping about each others families, and giving their grandsons a clip round the ear for getting so many punctures.
Tubular via Clincher questions...
- Thread starter Heisenberg71
- Start date
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Justinslow
Lovely jubbly
- Location
- Suffolk
Might just do that, cheers!
Yellow Saddle
Guru
- Location
- Loch side.
The problem with sealant in thin-walled tyres and equally thin-walled tubes is that the high pressure of road tyres just blasts the sealant out without it having a proper chance to congeal. In MTB tyres on the other hand, it works reasonably well. The relative thickness of the tyre and the much, much lower pressure give plenty of purchase to the little granules in the sealant and gives the latex a little bit of time to congeal.
Further, even if your tyre does seal and you then use CO2 to inflate the tyre, it is ruined. The CO2 changes the pH of the suspension (usually an ammonia solution and water) which makes the latex precipitate out of the emulsion and ball up. This leaves the tube with a hard ball of latex and a thin useless and inert soup sloshing through the rest of the tyre that gives you the false impression that you still have some sealant in there.
Further, even if your tyre does seal and you then use CO2 to inflate the tyre, it is ruined. The CO2 changes the pH of the suspension (usually an ammonia solution and water) which makes the latex precipitate out of the emulsion and ball up. This leaves the tube with a hard ball of latex and a thin useless and inert soup sloshing through the rest of the tyre that gives you the false impression that you still have some sealant in there.
Ah yes. When I got my first puncture I was rather celebrating managing to roll the tub off and get the new one on. I kinda failed to notice I'd got glue on my hands until I went to change gears (downtube levers) and realized my hand was so stuck I'd have to stop to pull it off.
Who cares , they hardly break the bank buying a new one .
Citius
Guest
So if each puncture costs you between £35-70 (depending on what you buy and where you buy them) that's ok, is it?
Works out quite cheap when you add in the saving you get from buying tubs compared to clinchers .
What do you race on ?
Justinslow
Lovely jubbly
- Location
- Suffolk
So can you put the pit stop stuff in prior to a puncture hoping that it will save a puncture, or does it not work that way?
I squirted some in last season as i didn't know the state of the tubs that came with the wheels . Just fitted a new tub to the rear disk so wont bother as i know its good .
Does that depend on your value of "high pressure"? Tubeless (not tubs) road tyres exist and use a sealant of some sort without the problems you describe. Or is "Stan's sealant" different to the latex you describe?
Citius
Guest
Not sure I share your concept of 'saving' tbh. Schwalbe One clinchers can be had for less than £25ea at the moment and I used to buy Conti GP4K for not much more.
I used to race on Corsa CX originally, then Conti Competition, not that it really matters...
I was talking about the cost of the wheels .
Yellow Saddle
Guru
- Location
- Loch side.
High as in much higher than in MTB tyres. 60 PSI is high in that scenario and latex just squirts out most of the time on tubs.
We are talking tubular tyres here, not tubeless. Tubeless road tyres are several times thicker than tubs and their tube together. That helps in giving the sealant some mechanical adhesion.
Stan's sealant is latex in an ammonia suspension with some tiny rubber granules. It is particularly susceptible to CO2 inflation.
