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Thread: Front-end wobble??

  1. #16
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    18th September 2007 - 12:14
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    Quote Originally Posted by F5 Dave View Post
    well I wasn't about to stalk you to find out the info

    If you don't report back in 2 hrs we'll assume the worst. Good luck.
    Well I survived...

    No wobble whatsoever without the top box so there ya go!

    So it much be the weight/wind force at so far back on the back that causes a slight rear wobble that is exaggerated at the front. Since the wobble is only between 60-65kph do I need to worry at all or is that sweet? Sure if it got worse with speed I'd get rid of it, but it rides fine <60 and >65.


  2. #17
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    4th November 2007 - 16:56
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    Prolly be the wake of the wind coming round you and getting turbulance on the top box, exagerated by the fact your rear tyre is almost kaput ! Check ya pressures anyway !
    A girlfriend once asked " Why is it you seem to prefer to race, than spend time with me ?"
    The answer was simple ! "I'll prolly get bored with racing too, once i've nailed it !"

    Bowls can wait !

  3. #18
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    Quote Originally Posted by Ragingrob View Post
    So it much be the weight/wind force at so far back on the back that causes a slight rear wobble that is exaggerated at the front.
    Yes.
    It's a factor of a couple of things:
    Firstly, the topbox is making the load on the front wheel slightly less (so it's less "planted").
    Secondly (but perhaps most importantly), the aerodynamics of the topbox are a bit 'dodgy' at some speeds.
    Fifthly, there's the leverage effect: anything right at the rear of the bike and high up exerts more force than something closer to the centre of mass of the bike.
    ... and that's what I think.

    Or summat.


    Or maybe not...

    Dunno really....


  4. #19
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    Quote Originally Posted by sinfull View Post
    Prolly be the wake of the wind coming round you and getting turbulance on the top box, exagerated by the fact your rear tyre is almost kaput ! Check ya pressures anyway !
    I hate it how commuting does your tyres just through destroying the middle

    Only one more week of commuting though so I reckon it'll last out most of summer cause I'll be using the edges

  5. #20
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    18th September 2007 - 12:14
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    Quote Originally Posted by vifferman View Post
    Yes.
    It's a factor of a couple of things:
    Firstly, the topbox is making the load on the front wheel slightly less (so it's less "planted").
    Secondly (but perhaps most importantly), the aerodynamics of the topbox are a bit 'dodgy' at some speeds.
    Fifthly, there's the leverage effect: anything right at the rear of the bike and high up exerts more force than something closer to the centre of mass of the bike.
    Sweet then, all good now I know what's causing it!

  6. #21
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    Quote Originally Posted by vifferman View Post
    Hmmmm... Dunlops.
    ...
    So all tyres manufactured by Dunlop are the same? I think you'll find that they have been going for quite some years* & they may have changed their construction in that time. let alone with different models.



    *[quick google]: "In 1888, John Dunlop invented the air-filled or pneumatic tires, "
    Don't you look at my accountant.
    He's the only one I've got.

  7. #22
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    Many Police bikes have been made unstable by fitting a whole lot of crap to them causing much litigation. I remember my poor CBX550 was a bit prone but one cold kiwi I loaded up with a big pack hung out the back & set off to go pick up a girl.

    I didn't make it further than the top of the drive until I turned back to check tyres & see if the forks were loose. It wobbled like crazy. But all checked out. So I turned the pack so it was over the pillion seat & the bike handled fine. Got to her house & with pack turned around again but her on the pillion it returned to it's wayward ways, but only half as bad & only at low speeds. Course I didn't tell her this.

    That was the year the storm hit & the desert road was closed. We'd left on the thursday to spend night in Turangi & went through the road just as it was closing & snow was falling at about 20kph following a car's wheel tracks.
    It was interesting.
    Don't you look at my accountant.
    He's the only one I've got.

  8. #23
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    Quote Originally Posted by Ragingrob View Post
    I reckon it'll last out most of summer cause I'll be using the edges
    Bwahahaha looks forward to the pics of you weaving up and down the Highway !!!
    A girlfriend once asked " Why is it you seem to prefer to race, than spend time with me ?"
    The answer was simple ! "I'll prolly get bored with racing too, once i've nailed it !"

    Bowls can wait !

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