chewy Posted January 22, 2011 Report Share Posted January 22, 2011 Tyre deflation problems ; I have been through a whole gamut of solutions regarding tubeless tyre going down and poping of the rim.Any solutions other than new rim tape /how to fit it etc etc.... been there done it however during this voyage of (re) discovery) i am finding with my rim that I can walk both an IRC and a Michilin onto the rim with no levers and get them to pop out to seal the beads with no gadjets tricks or anhything just a compressor , valve out and away it goes, The down side of this is that the tyres will roll straight off just as easily which led me to wonder if the rim is a bit on the small size (diameter) has any one experienced similar ? has anyone any information regarding what size rim should be and where measured from and what tolerances would the tyre people guarantee their tyres to fit properly? . Long question but this problem persists. Quote Link to comment Share on other sites More sharing options...
baldilocks Posted January 22, 2011 Report Share Posted January 22, 2011 Yes I have heard of this before on a Gas Gas a few years ago. One side of the rim was smaller than the other, only by a couple of mm I think (wasnt my bike) but it was enough to cause the problem. suggest you get hold of a wheel off somebody and measure them both. Quote Link to comment Share on other sites More sharing options...
timp Posted January 22, 2011 Report Share Posted January 22, 2011 I know of a wheel that was too small. The tyre wouldn't hold air and came off the rim very easily. It was measured and was a fair bit less than others. Think it was swopped under warranty. As Baldilocks suggests get a measurement off another and compare them. I have just taken off an IRC which was always going down from new and I know of a few doing the same but I think this is just an IRC thing at the moment. Quote Link to comment Share on other sites More sharing options...
perce Posted January 23, 2011 Report Share Posted January 23, 2011 A few years ago I had a wheel that was small & it constantly dropped tyres. Check the circumference of your wheel against a known good wheel. Quote Link to comment Share on other sites More sharing options...
copemech Posted January 23, 2011 Report Share Posted January 23, 2011 Thought you were leaking around the spokes? Just a couple thoughts here. Even though getting them onto the rim may be fairly easy, then getting them to seat onto the outer beads of the rim when applying air, you should get two distinctive "pops" as the beads pop into position, usually requiring at least 30 or so psi, even with good lube. Good pop it is too, usually, as they are tight. Not sure about the IRC, but on a Mich and Dunlop, there is a little fine line moulded on the tire just outside the bead that one can look at to insure it is seated evenly all around. Seems to me in order to get a good measure on these, you would need to do it yourself in the same spot, and with the same tool or rule to be accurate enough. Quote Link to comment Share on other sites More sharing options...
tony27 Posted January 23, 2011 Report Share Posted January 23, 2011 Have seen them oversize as well, a friend has 1 that he won't put a IRC near as he managed to split 2 through the sidewall trying to get them seated. I can't remember just how much it was bigger it measured but any tyre that had been on there won't seal on any other rim due to the bead having been stretched Quote Link to comment Share on other sites More sharing options...
chewy Posted January 23, 2011 Author Report Share Posted January 23, 2011 Thanks all for your comments, all helpfull I can flash a tape measure or even put wheels up on a machine tool to measure accuratly which I think I will have to do but it still remains to find out what it should be and then I have a rock solid warranty complaint backed up by facts (what should the rim nomenclature be?) rather than comparisons /hearsay etc. etc. Put a Michelin on last night and wonder of wonders it stayed up all day today (riding same stuff as yesterday where the IRC came off) at 3PSI (sidewalls are stiff as hell even at that low pressure). I was keeping the Michelin for summer riding in hot rocky conditions, here at home, cold/ mud /roots the performance of the IRC (if it ever stayed on the rim) is far more suited to the going. The jury is out at the moment ;.. is it the tyre or the rim undersize, I have to say the Michelin went on all the way by hand /Knee until the last 4 inches and it popped out dry with no lubrication, gap filler "mousse/ hoop which I have been using since tubeless tyres came into get them to initially seal prior to popping em out onto the rim. As a guy who has been buying 2 new bikes every year for the last 15 years (I WAS in the money) I have grown used to the variations in attitude regarding warranty complaints; I feel there@s a problem with this rim but I also know I have to have incontrovertable evidence to back it up. Keep you posted. Quote Link to comment Share on other sites More sharing options...
copemech Posted January 24, 2011 Report Share Posted January 24, 2011 Seems to me that many tires will go on without the "mousse" , but on occasion you get no choice, just that tire. Quote Link to comment Share on other sites More sharing options...
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