Tyres and rims are winding me up
Ok, bianchi via neurone 2012, standard wheels with standard vredestein diamanté tyres. I noticed on a flat bit of road that the bike was "thumping " as I was going down the road, on closer investigation I have found that the tyres are nearly impossible to seat in the rim properly, if you follow the bead of the tyre all the way round, it always dips by about 5 or 6 mm for about 3 inches, and if you pull it out, it just moves round the rim, this is driven me crazy, and advice, I have tried half inflating and rolling the tyre, and fully inflating and bouncing but it makes no difference? Any advice
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http://instagr.am/p/Oj3Y3inUtM/. You can just see it in this pic0
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What is the tyre pressure?Faster than a tent.......0
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I has it at 100 psi but even with nothing it's the same0
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Seems pretty odd to me. Presumably, as per your description, the low point is not a specific point in the tyre or rim?
The only thing I can think of is that the inner tube might be too small for the tyre. Basically, if the inner tube is at the correct size and pressure, it will be pushing the tyre out as hard as it can and pushing the bead against the wheel as hard as it can. It's hard to see how a properly inflated inner tube of the correct size inside a non defective tyre could allow you to pull it out and move it around.
Best thing to do is just try another inner tube (definitely the right size - radius and width) and see if the problem remains. There are only three variables here (wheel, tube, tyre) and the tube is the cheapest one to eliminate.Faster than a tent.......0 -
Any tube at 100 psi will expand to fill the space around it. Sounds to me as if the tyre bead is fractionally too tight / small, so at some point it is being pulled down into the rim. I think you should take it back to the shop.0
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keef66 wrote:Any tube at 100 psi will expand to fill the space around it. Sounds to me as if the tyre bead is fractionally too tight / small, so at some point it is being pulled down into the rim. I think you should take it back to the shop.
Yeah, I was grasping at straws to some extent and not convinced about my own reasoning but this does seem feasible at least. Mind you, this would surely imply that the problem would have occurred since new rather than being a development. But then the original post doesn't make this clear anyway.Faster than a tent.......0 -
The pressure may be constant inside the tube but that does not mean the tube will be expanded evenly around the tire. Replace the tube with a new one, i've felt that before myself.0
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i had that exact same problem with a mates tyre
turned out it was the crease left from his spare tube being coiled/folded up in his bag.
changed it to a fresher tube and it stopped doing it
took 40 mins to change the tube that day due to faffing about trying to get it to seat!0 -
Still can't imagine it, but it seems the anecdotal evidence suggests the tube could be the cause of the problem!0
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while it seems so unlikely it was the case then.
i have never seen that sort of situation before though0 -
had exactly this on a rear Fulcrum 5 and a Vittoria (which is the make you have) pave tire (perfectly ok with a conti 4000S), fix was to replace the std 18mm rim tape with 16mm tape, allowing the tire bead to seat into the rim hook all the way round.0
