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  • Tyre Dilemma…

     BMR updated 11 years, 8 months ago 5 Members · 7 Posts
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  • MiniMental

    Member
    18 September 2009 at 3:40 pm

    Hey guys,

    I have a question about tyres.

    1st, my bike came with (new) a set of conti mtn king 2.4’s. They fit it fine. with no problems.

    2nd, i have now had a set of panaracer FR 2.4’s on it for about 3 months. Despite the 2.4″ badge, they are inherently wider. i measured them across and they are 2.6″ My problem is, my back wheel is SLIGHTLY buckled.. unnoticable until a few days ago. Now, my tyre has started rubbing my chainstay and has now managed to wear about .5 of a mm into my chainstay.

    1st question, If i stop the problem now, will my frame survive?

    2nd question, why are the tyres wider than the badged spec? Will a set of conti Diesels 2.5 fit? I would go back to the mtn kings but cant find them anywhere and i wont buy tyres online after my last ordeal.

    3rd question, i have sucessfully trued my wheel (2009 mavic crossride disc) twice… every time i true it, after a few miles it seem to untrue itself and the tyre starts rubbing again. And ideas as to why its de-truing itself?

    Hope somebody cn help me because im stumped and stuck :/

    Mini

  • Gunner

    Member
    18 September 2009 at 6:58 pm

    Should a rubber tyre be wearing away a metal frame?

    Are you sure that’s what is causing it?

  • BMR

    Member
    18 September 2009 at 9:26 pm

    If it was just rubber no but we ride on soil, mud and sand which when picked up on the tyres act like grinding paste, sand in particular is very abrasive and will soon grind away at paint and alloy.

  • MiniMental

    Member
    18 September 2009 at 10:17 pm

    im positive thats whats causing it m8, when i spin my wheel i can see the edge on my tyre sits perfectly in that groove. couldnt be anything else. Ive used the best of my engineering analysis skills to determin that 😉 , Just dont know what i can do about it, can’t afford a new tyre atm.. :/ only thing i can do atm is true my wheel up after every ride.. which is damaging towards the wheel coz’ it’l eventually distort the rim.

    Mini

  • tomlevell

    Member
    19 September 2009 at 1:38 pm

    1st question, If i stop the problem now, will my frame survive?

    Probably

    2nd question, why are the tyres wider than the badged spec? Will a set of conti Diesels 2.5 fit? I would go back to the mtn kings but cant find them anywhere and i wont buy tyres online after my last ordeal.

    Probably as Conti’s seem to measure up to the size accross the knobs rather than the carcass. My Mountain King 2.4 are 2.4″ across the widest knobs. Most people seem to complain they are small for a 2.4.

    3rd question, i have sucessfully trued my wheel (2009 mavic crossride disc) twice… every time i true it, after a few miles it seem to untrue itself and the tyre starts rubbing again. And ideas as to why its de-truing itself?

    Because tension needs to be even in all spokes. Also when tightening a spoke you need to over tighten by about 1/4 of a turn and then undo to stop the spoke unwinding due to twist. That may well fix your problem.

    im positive thats whats causing it m8, when i spin my wheel i can see the edge on my tyre sits perfectly in that groove. couldnt be anything else. Ive used the best of my engineering analysis skills to determin that Wink , Just dont know what i can do about it, can’t afford a new tyre atm.. :/ only thing i can do atm is true my wheel up after every ride.. which is damaging towards the wheel coz’ it’l eventually distort the rim.

    Cut the knobs on the tyre down on that side ;0)

    I’m being serious.

    It shouldn’t damage the rim but it’s certainly not ideal. Also warranty for the wheels?

  • SeanO

    Member
    19 September 2009 at 2:13 pm

    Mini,

    What ordeal did you have with tyres bought online?

    I might have some part worn tyres in the garage that you can have.

    I’ll have a look when I get home.

  • BMR

    Member
    19 September 2009 at 3:43 pm

    As just said trim the knobles down a bit on the tyre. If you have an angle grider and a friend this is an easy task, put your bike in first gear, turn your bike upside down and whils you carefully hold the angle grinder with both hands get your mate to turn the pedals slowly by hand with the wheel rotating gently slowly move the angle grinder closer to the knobles. Only trim enough off to miss your frame and give a little clearence.

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