02GF74
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| posted on 20/4/09 at 07:47 AM |
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OT - fixing mtb tubeless tyre
tubeless mountain bike tyres are the invention of satan but a bike I have has them on and I have a leak 
The try will go soft over say a week so the air leak is tinuy but still ...
Putting the tyre in the bath allowed me to locate a 2 mm nick on the outside but no sign of any damage on the inside.
Easy peasy I thought, little did I know ....
Attempt 1 was to glue using rubber solution (As for inner tube) a small patch, 2 cm square inner tube, roughened up. - still leaking.
Attempt 2 as above but proper tube patch, a big one - still leaking.
Attempt 3 was to cover the area with PU type sealant - still leaked.
Attempt 4, like 2 but use a hoooooooge patch of iner tube, 30 x 50 mm - STILL LEAKING?!?!!?! 
I don't understan how that can be!!
My reasoning is that the inner tube patch would be forced againstthe tyre by air pressure so that no air can get under it and escape.
My theory at the moment is that the air is travelling allong the plies and the cut allows the air to get out.
The rubber solution nor the PU do not stick particuarly well to the insdie of the tyre.
So anyone have any ideas on how to fix this?
Been googling and it seems kits are available that appear to me that you have to make a bigger hole! and then plug it up - not keen on that as the
plies will be damaged doing that.
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balidey
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| posted on 20/4/09 at 08:01 AM |
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quote:
Originally posted by 02GF74
So anyone have any ideas on how to fix this?
Fit an inner tube 
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02GF74
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| posted on 20/4/09 at 08:04 AM |
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^^^ apart from fitting an inner tube, kinda defeats the purpose of having tubeless tyres. 
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Mr Whippy
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| posted on 20/4/09 at 08:06 AM |
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ditch the tyre, they're not even pricey and it could just fail in the middle of nowhere or as your going round a corner...crash 
are you sure the wheel rim inner edge isn't damaged or spokes leaking? I use tubes regardless as it doesn't take much to push a tyre of
the rim a bit, especially offroad. I also used tubed tyres on the landys for the same reason
[Edited on 20/4/09 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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Davey D
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| posted on 20/4/09 at 08:07 AM |
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when you fit the patch you could fit an innner tube, and inflate it so the inner tube directly applies pressure to the patch making sure it is pressed
onto the inside of the tyre while the glue sticks? then remove the inner tube, and give it a try
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02GF74
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| posted on 20/4/09 at 08:20 AM |
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quote:
Originally posted by Mr Whippy
ditch the tyre, they're not even pricey and it could just fail in the middle of nowhere or as your going round a corner...crash
are you sure the wheel rim inner edge isn't damaged or spokes leaking? I use tubes regardless as it doesn't take much to push a tyre of
the rim a bit, especially offroad. I also used tubed tyres on the landys for the same reason
ooh, Mr whippy, you are a bit behind the times.
new tubeless tyre is at least £ 30 so not lexactly locost.
no chance of spoke end damage as the rim is not drilled.
I doubt the tyre will fail due to the tiny cut, and it is tiny.... and I am loathe to throw the tyre away due to this.
A trip to the LBS tommorrow to se what they say.
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idl1975
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| posted on 20/4/09 at 08:24 AM |
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Afraid I'm in the camp of "put a tube in it".
Yes, that defeats the point of tubeless tyres. However, unless you're a XC racer, the chief effect of tubeless tyres appears from your
experience to be "ar**ache"... )
quote:
Originally posted by balidey
quote:
Originally posted by 02GF74
So anyone have any ideas on how to fix this?
Fit an inner tube
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Mr Whippy
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| posted on 20/4/09 at 08:49 AM |
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quote:
Originally posted by 02GF74
quote:
Originally posted by Mr Whippy
ditch the tyre, they're not even pricey and it could just fail in the middle of nowhere or as your going round a corner...crash
are you sure the wheel rim inner edge isn't damaged or spokes leaking? I use tubes regardless as it doesn't take much to push a tyre of
the rim a bit, especially offroad. I also used tubed tyres on the landys for the same reason
ooh, Mr whippy, you are a bit behind the times.
new tubeless tyre is at least £ 30 so not lexactly locost.
no chance of spoke end damage as the rim is not drilled.
I doubt the tyre will fail due to the tiny cut, and it is tiny.... and I am loathe to throw the tyre away due to this.
A trip to the LBS tommorrow to se what they say.
Not really, my bikes only a year old and a nice machine, I use it all the time off-road. I also use tubes for a reason, that being at around 40psi it
doesn't take much to push a tubeless tyre off its rim especially if on rocky ground and if that happens, then the tyre instantly deflates along
with probable rim damage. If it happens on a front tyre and you’re going down a steep hill then you'll land on your face, all for the sake of a
simple tube. There are plenty of 'modern ideas' some good some bad and some just suck
[Edited on 20/4/09 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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britishtrident
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| posted on 20/4/09 at 11:07 AM |
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Most likely leaking in the bead area, you need to knock off the beads and apply a generous ammount of tyre fitters soap bead lubricant to the
sealling area of the rim and the edges of the tyre bead.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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02GF74
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| posted on 20/4/09 at 11:15 AM |
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^^^ maybe as well but when I put water mixed with washing up liquid and can see tiny bubbles just exactly where the nick is.
it is most perplexing ...
[Edited on 20/4/09 by 02GF74]
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Mr Whippy
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| posted on 20/4/09 at 11:40 AM |
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quote:
Originally posted by 02GF74
timmy bibbles
Fame is when your old car is plastered all over the internet
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02GF74
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| posted on 22/4/09 at 08:52 AM |
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Quick update.
I bought a tubeless tyre reapir kit - appears to be super glue and normal patches - for an extortionate amount, deliberate decision since I try to buy
one or two things from my local bike shop to keep them ticking over.
cleaned the cut out with meths then applied a couple drops of the super glue. everything points to it being regular super glue, that incidentally I
bought a tube of from poundland - will try that one later to confirm.
whilst I am sceptical about durability of the repair, there is no air leaking.
will see how it pans out when ridden.
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Peteff
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| posted on 22/4/09 at 09:28 AM |
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You need feather edged patches for the inside of the tyre with proper vulcanising solution, Weldtite cure-c-cure are good.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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02GF74
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| posted on 22/4/09 at 09:55 AM |
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What has Spock got to do with it?
rubber solution does not want to stick to the inside, nor Evostik stronger than welding grey sealant stuff.
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