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high speed front wheel shaking, wobble, etc, etc?(7 posts)

high speed front wheel shaking, wobble, etc, etc?marcoxxx
Jun 30, 2003 4:37 AM
what is the main reason or suspected reasons for front wheel wobble on high speed decents if wheels are true, and all else seems tight and in alighnment. Body and hands postioning? 80mm stem? I am riding an almost new caad7. On 40mph+ decents the bike become a shaking machine!!

thanks,
mark
Loosen your grip on your bars-filtersweep
Jun 30, 2003 6:38 AM
You probably have a death grip which can cause this exact problem.

It creates a nasty feedback loop- the shakier your bike feels, the tighter you grip, the even more shakier it get...

If you relax a bit, it should go away... unless you have legit equipment problems. The bike simply needs to flex and respond in its own way- if you fight it, your bike will fight back :)
thanks ..will try out (nm)marcoxxx
Jun 30, 2003 8:49 AM
re: high speed front wheel shaking, wobble, etc, etc?lsalins
Jun 30, 2003 8:15 AM
My high-speed wobble happened whenever I hit 45 mph. The LBS that sold me the 99 Lemond Zurich was unable to diagnose. Went to a different dealer and they put it on a "fork jig". The ends of the fork were 3/8" off. Lemond replaced the fork under warranty. No problem since. Not the least wobble at 55 mph.
thanks...will checkout (nm)marcoxxx
Jun 30, 2003 8:51 AM
nm
Tires?peter1
Jun 30, 2003 2:24 PM
One possible diagnosis, from my experience: if the tire is not cast correctly, a wobble could result. This happened to me recently when I put on a new front tire. Replaced it, and all was well. You might try a new tire if other fixes don't work.

Also, try this test: Ride no-handed and see if a wobble develops as you shift your weight forward and back. I've found that if my weight is too far back it unweights the front enoght to create a wobble...this might help you determine if the problem is you or the bike.

By the way, Lennard Zinn has covered this topic ad nauseum in Velonews.com. You should be able to find it in the archives. One possibility is a frame that isn't true. Hope that isn't the problem...
Simple fix...willin
Jun 30, 2003 3:09 PM
Put a kneee against the top tube of your bike. That almost always quiets things down.

Most fast decenders will have their knees touching the top tube. You steer the bike by increasing or decreasing pressure on the top tube.

relaxed qrip on the bars, butt a bit off the seat and a bit back, and you're good to go.