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High Speed Front End Wobble
#343735 07/13/2009 3:47 PM
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69tri1 Offline OP
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I have been experiencing some high speed front end shake or wobble lately that I did not have before. It is fine up to about 100 mph then I notice the shake or wobble. The front tire looks fine with no visible damage or wear. I am currently running the Avon Venoms front and back. The back is starting to show signs of wear but not the front. Has anyone else experienced this? I wouldn't think that I need to get my front tire re-balanced but ??? Does anyone else have their tires re-balanced during the life of your tires??? My other option is just replace both tires and be done with it.

Re: High Speed Front End Wobble
69tri1 #343736 07/13/2009 3:50 PM
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...........or dont go that fast


Grzegorz ......55 cubic inches http://www.flickr.com/photos/25172906@N06/ 904WisecoTPUSAcamsTTPignitorgutted Airbox"breath"airIntakeKeihinCR-ScarbsBlackEpcoExhaustS/SwheelsPortedPolishedHead
Re: High Speed Front End Wobble
Grzegorz #343737 07/13/2009 4:02 PM
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Quote:

...........or dont go that fast




Problem is me likes going fast every now and then. More often than not!

Re: High Speed Front End Wobble
69tri1 #343738 07/13/2009 4:06 PM
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Quote:

Quote:

...........or dont go that fast




Problem is me likes going fast every now and then. More often than not!




same issue here


Grzegorz ......55 cubic inches http://www.flickr.com/photos/25172906@N06/ 904WisecoTPUSAcamsTTPignitorgutted Airbox"breath"airIntakeKeihinCR-ScarbsBlackEpcoExhaustS/SwheelsPortedPolishedHead
Re: High Speed Front End Wobble
69tri1 #343739 07/13/2009 4:11 PM
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Check steering head bearings,front/rear wheel alignment.Front wheel bearings.Do a wheel balance.How many miles on the tyre?
I had one that went away 5kph either side of 80kph.Fixed it[I think] with new tyre.At 100mph though???


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Re: High Speed Front End Wobble
findlay13 #343740 07/13/2009 7:32 PM
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Check Pants
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I just replaced my headset and wheel bearings from AllBallsRacing.com. The headset was dry on the neck bearing, and probably would have been fine with some grease and an adjustment. One of my wheel bearings was tight. My bike has 30k on it.
Quote:

Check steering head bearings,front/rear wheel alignment.Front wheel bearings.Do a wheel balance.How many miles on the tyre?
I had one that went away 5kph either side of 80kph.Fixed it[I think] with new tyre.At 100mph though???




Al
Re: High Speed Front End Wobble
69tri1 #343741 07/14/2009 1:02 AM
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Didja ever skid the back tire? I've had 3 sets of Avons, and while I don't go 100 mph, I do know that once the rear is "showing signs of wear" it ain't long till it's showing cords. A panic stop where you lock up the rear really hastens the process. And the fronts seem to cup badly after about 2500 miles.

My experience - YRMV...


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Re: High Speed Front End Wobble
Deon #343742 07/14/2009 1:31 AM
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Our bikes do 100 mph? lol jk

Re: High Speed Front End Wobble
Deon #343743 07/14/2009 9:26 AM
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69tri1 Offline OP
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Quote:

Didja ever skid the back tire? I've had 3 sets of Avons, and while I don't go 100 mph, I do know that once the rear is "showing signs of wear" it ain't long till it's showing cords. A panic stop where you lock up the rear really hastens the process. And the fronts seem to cup badly after about 2500 miles.

My experience - YRMV...




Is that like wichadidja? I have locked up the rear tire on occaision and it looks like I will be replacing the rear tire at a minimum before the NorEast Rally. I have looked at the front and there is no visible cupping, even running my hand over the tire I can not feel any cupping or uneven wear. I probably will just replace them both to be safe. Better safe than sorry!

Re: High Speed Front End Wobble
69tri1 #343744 07/14/2009 11:36 AM
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That's got to be more than a little unnerving to get a wobble at 100 MPH!! Yikes!


Live to love, love to live.
Re: High Speed Front End Wobble
Keith #343745 07/14/2009 12:10 PM
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69tri1 Offline OP
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Quote:

That's got to be more than a little unnerving to get a wobble at 100 MPH!! Yikes!




It is not that bad but there is a definite shake or wobble at 100+ mph. If I stay under the ton (actually about the 110mph)mark it is good.

Re: High Speed Front End Wobble
69tri1 #343746 07/14/2009 4:19 PM
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This one's a big maybe but easy to try.
Our bikes are about as aerodynamic as a brick.
The faster you go, the less weight is on the front tire due to wind pressure.
Try going one notch higher on the rear spring preload and see if that helps.


Steelheart- '03 Speedmaster Black/Yellow The Hayabusa Killa 16" Shorties/140 mains/Airbox drilled Procom CDI "There is no cure for Celibacy. But we can treat the symptoms."
Re: High Speed Front End Wobble
69tri1 #343747 07/15/2009 10:11 AM
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I had the same thing happen to me. Right at 100 mph the front would shake bad. I checked the wheel and tire for round and couldn’t find a problem anywhere. I put on a new front tire and all was fixed. The tire was a Metzler 880, wore but not wore out. A few days before, I had hit a cut in the pavement where Penn DOT was doing something. It was a pretty hard hit so I figered that caused the shake even though I couldn’t see anything wrong. Dealer tightened the head bearings and checked the balance with no help. In the end a new tire fixed it.


I've become comfortably numb

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