casspir Posted October 28, 2007 Share Johan,What tyres did Andrew use on the Epic?Regards,c Link to comment Share on other sites More sharing options...
davetapson Posted October 28, 2007 Share dave' date=' nice putting a face to a name on saturday. did you come right with that slime? [/quote'] I did, thanks h-r. Tried to squeeze the green stuff out of the tube but there seemed to be none left. Put sludge in and it seems 100% - had picked up ANOTHER puncture just before and the sludge sealed the hole while I was patching it. Gonna have to go Joes / Stans tho'. How do I get a discount? Link to comment Share on other sites More sharing options...
Tumbleweed Posted October 28, 2007 Share dave' date=' nice putting a face to a name on saturday. did you come right with that slime? [/quote'] I did, thanks h-r. Tried to squeeze the green stuff out of the tube but there seemed to be none left. Put sludge in and it seems 100% - had picked up ANOTHER puncture just before and the sludge sealed the hole while I was patching it. Gonna have to go Joes / Stans tho'. How do I get a discount? you want me to rip off a mom and pop lbs?i'll knock a bit off for you Link to comment Share on other sites More sharing options...
davetapson Posted October 29, 2007 Share Hey - 'twas pop what sold me the green-slime-I-seal-nothing-giant-tubes in the first place!! Man, there was something I wanted to ask you and it's completely slipped my mind... Link to comment Share on other sites More sharing options...
Mudsimus Posted October 29, 2007 Share The only problems I had with stans and tyres were with the Revolt super x. I saw one set that were totally destroyed within 2 weeks. The stans "eats" through the rubber inside causing the tyre to bubble out. That's what worries me!! Unless he's just taking the mickey of course... I am willing to bet that the Stan's didn't eat right through the tyre. Not even halfway. Please post photos of the "eaten out" spot on that tyre. The tyre bubbles out not because the Stan's has eaten the tyre' date=' but because there was a partial hole in the tyre on the inside, that didn't protrude to the outside - a hole left there by manufacturing and poor fabrication. Since the tyre is now a tubeless tyre, the air goes into that hole (or the Stan's, it doesn't matter which) and works its way along the channels left there by the porous cords and forms a bubble directly underneat the best sealed part of the tyre - the thread. If this tyre had a tube in, the air wouldn't be there in the first place to find a little wormhole and works its way to the outside. However, take the tube out and it does. The fact that there was Stan's in there or water or brandy would have made no difference. It will be forced out if the tyre doesn't seal properly on the inside. I'd still love to see some photos of this eroded tyre. If you don't have a camera with a nice macro setting, cut the piece of tyre, pop it in the mail to me at PO Box 31781 Kyalami 1684 and I'll do the photography and post the photos. JB[/quote'] Sorry for not being technically correct.... Here's the pic. When the tyre is inflated the marked part causes a bubble on the thread. Tyre almost brand new. Link to comment Share on other sites More sharing options...
Johan Bornman Posted October 29, 2007 Share Nice photo, thanks. For those who don't know what they're looking at, it is the inside of the tyre and the white stuff is Stan's or similar. The marked spot is where the congealed Stan's (actually just latex), was peeled off, probably by the photograher (MudDee??) to inspect the source of the bubble. Were this a chemical reaction between the latex and the tyre, the problem would have been distributed pretty uniformly around the inside of the tyre. But, what we're seeing is just a spot on the tyre where there wasn't (before the latex was inserted) any rubber in the first place. Besides, a small weak spot like that is not enough to make a big bubble on the outside. Something else is at work. With a standard tyre intended for tube use, that wouldn't matter. However, as soon as you make the tyre tubeless, the compressed air has direct access to the cords, which are porous and lead deeper into the tyre. The pressurised air would travel along the cord as if it is a capillary (little pipe). Mostly those capillaries come to a harmless dead end. But should they take the air to a spot just under the thread where the there is perhaps some imperfect vulcanisation, it would lead to a bubble on the outside of the tyre. See it as a partial puncture from the inside out, that dead-ended into an existing air bubble inside the tyre. This was a faulty tyre, but don't expect to make a gaurantee claim. This tyre was not intended for tubeless use (if it was, then demand a replacement). JB Johan Bornman2007-10-29 08:40:06 Link to comment Share on other sites More sharing options...
Mudsimus Posted October 29, 2007 Share Actually it is a tubeless tyre...or as they like to refer to as a tubeless ready tyre. I've got 6 of them looking like this. But if you try to make a claim you are told that you are not supposed to use stans, but only their very expensive sealant. Link to comment Share on other sites More sharing options...
davetapson Posted October 29, 2007 Share Johan Interesting stuff. 1. Can one stop this happening - maybe by coating the inside of the tyre with sealant before putting it under pressure? My reasoning being that if you can saturate the cord before putting pressure in, then you won't get the capillary action along the cord? 2. If one does get bubbles (assuming there are not too many), can you puncture them from the outside and let the sealant seal the capillary once the pressure is released? Or does the tyre get too damaged by the air bubble (I assume it will delaminate or something similar?) RegardsDave Link to comment Share on other sites More sharing options...
Johan Bornman Posted October 29, 2007 Share Johan Interesting stuff. 1. Can one stop this happening - maybe by coating the inside of the tyre with sealant before putting it under pressure? My reasoning being that if you can saturate the cord before putting pressure in' date=' then you won't get the capillary action along the cord? 2. If one does get bubbles (assuming there are not too many), can you puncture them from the outside and let the sealant seal the capillary once the pressure is released? Or does the tyre get too damaged by the air bubble (I assume it will delaminate or something similar?) RegardsDave[/quote'] Dave, I think you make an excellent suggestion here. Yes it would work to paint it with pure latex beforehand. Buy it from a carpet shop by the 5l can for R260. Maybe two layers will do the trick. On your suggestion of puncturing the blisters....I don't know. Is it better to squeeze a pimple than leave it? Perhaps if you can identify the problem before it has made a big enough bubble to make the tyre unrideable, then yes. But I would think that it would only become noticeable once it is too late. JBJohan Bornman2007-10-29 09:34:56 Link to comment Share on other sites More sharing options...
davetapson Posted October 29, 2007 Share JohanWhat about giving the inside of the tyre a good coating of tyre sealant (stans/joes), maybe with paint brush or something to ensure a good covering before fitting the tyre and inflating it? Link to comment Share on other sites More sharing options...
Tumbleweed Posted October 30, 2007 Share JohanWhat about giving the inside of the tyre a good coating of tyre sealant (stans/joes)' date=' maybe with paint brush or something to ensure a good covering before fitting the tyre and inflating it?[/quote'] i'm not johan, but i reckon if you "overdose" a little on sealant and spin the wheel vigorously enough in your hand, you'll have it all covered. Link to comment Share on other sites More sharing options...
dirtrider Posted October 30, 2007 Share I think that is a very expensive way of doing it and Joe/Stans seals holes , I don't think it's gonna put a good layer inside the tyre . Johan's idea sound much better and cheaper as well . Link to comment Share on other sites More sharing options...
Mudsimus Posted October 30, 2007 Share You can also try to "paint" the inside of the tyre with crafters latex. When it dries it leaves a very sticky rubber like coating layer. I've done it a few times with normal tubed tyres and it works way better than tye liners. Link to comment Share on other sites More sharing options...
Johan Bornman Posted October 30, 2007 Share You can also try to "paint" the inside of the tyre with crafters latex. When it dries it leaves a very sticky rubber like coating layer. I've done it a few times with normal tubed tyres and it works way better than tye liners. I don't understand??? The latex coating idea was proposed to stop the leaks that originate on the inside and form bubbles under the tread. Tyre liners do something completely different - they provide a tough substance under the thread to deter punctures from the outiside. They also don't seal. JB Link to comment Share on other sites More sharing options...
Mudsimus Posted October 30, 2007 Share If you apply several coats of the latex you can create a layer up to 3mm thick on the inside of the tyre. I've done it before,its quite time consuming but it works. The latex is so tough that a thorn wont penetrate it easy. Link to comment Share on other sites More sharing options...
Johan Bornman Posted October 30, 2007 Share If you apply several coats of the latex you can create a layer up to 3mm thick on the inside of the tyre. I've done it before' date='its quite time consuming but it works. The latex is so tough that a thorn wont penetrate it easy. [/quote'] Latex is softer than butyl (black tube rubber), tyre rubber and definitely softer than PVC used in tyre liners. A thorn will penetrate this layer like nothing. What it may do is provide some sort of slow-leak seal but armour it ain't. JB Link to comment Share on other sites More sharing options...
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