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Fork action & stability

drewwils@yahoo.com
 

I'm not able to take my bike over 75mph because of stability issues. Death wobble is inevitable. Even at lower speeds I can feel the instability with a little back and forth action on the handlebars.?
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Problem was there before a shop rebuilt them after someone hit my bike and bent the forks.
The forks are bouncy and not firm. Easy to collapse all the way down when you put weight on them.
My bike friends said they shouldnt do that... I have had transmission fluid rather than fork oil in them, but I did the same with my last W and had no issues. Stable up to 100mph Same transmission fluid.
Bearings were replaced at the same time as the forks were rebuilt.? Also added progressive springs. I've had the problem with BT46 and Road Classic tires.
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I'm taking them off and putting in Motul 15w fork oil tomorrow as my last resort to see if that helps. I may tighten the steering stem a bit as well but this baffles me.
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Could the frame be bent or something crazy like that?
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Had a similar prob with mine years ago, front tyre, and tyre pressure make quite a difference I found


On Saturday 2 November 2024, drewwils via <drewwils=yahoo.com@groups.io> wrote:
> I'm not able to take my bike over 75mph because of stability issues. Death wobble is inevitable. Even at lower speeds I can feel the instability with a little back and forth action on the handlebars.?
> ?
> Problem was there before a shop rebuilt them after someone hit my bike and bent the forks.
> The forks are bouncy and not firm. Easy to collapse all the way down when you put weight on them.
> My bike friends said they shouldnt do that... I have had transmission fluid rather than fork oil in them, but I did the same with my last W and had no issues. Stable up to 100mph Same transmission fluid.
> Bearings were replaced at the same time as the forks were rebuilt.? Also added progressive springs. I've had the problem with BT46 and Road Classic tires.
> ?
> I'm taking them off and putting in Motul 15w fork oil tomorrow as my last resort to see if that helps. I may tighten the steering stem a bit as well but this baffles me.
> ?
> Could the frame be bent or something crazy like that?
> ?
> ?
> ?
> ?
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It's been known that the W may experience a wobble, but it is correctable. Now, luckily I have never experienced this and easily took mine to 104MPH.? You stated your bike was hit? Yeah, that's a problem because there are subtle things even an experienced rider may not catch, like front ends being very slightly out of alignment and worse, frame damage.
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Who inspected your bike and signed off? W should absolutely be able to run at fast highway speeds without unsafe noises and wobbles if properly maintained. Not saying you ignore maintenance but bunch of flags went off when you said it was hit.?
For tires, I've had the BT45s, Pirelli Sport Demons, and Michelin Road Classics. I like the Michelins best and after 5,000 miles(woah, that came quick) they look nearly new. Trusted shop contacted Michelin, as did I, and they recommended front and rear pressures of 36 PSI. Feels great to me and handle well.
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Can you call upon a trusted expert to confirm no frame issues? I wouldn't hop on a bike if I suspected frame damage and now, with a concerning wobble? Nope. Get it sorted. Wish ya luck?
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I had similar issues. ?New Michelin road classic tires did not help. ?I did fit a stabilizer and it does help a lot. ?There is some wobble at higher speeds but very dependent on highway rain grooves. ?On my bike, I think the wobble may be more about the highway rain grooves (I live in San Diego). ?Seems to go anywhere I need to take a highway. ?


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NHK steering damper here. ?
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