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Ksyriums, decends and crosswinds...(5 posts)

Ksyriums, decends and crosswinds...Bruno S
Feb 18, 2003 9:22 AM
I was riding this last Saturday and I got to the start of a long decend with three other riders with Ksyriums SCC SL in similar bikes than mine. There was a strong crosswind and I had to break because of front wheel vibration and shimmy. Got dropped because of this. After catching up I asked all other riders using Ksyriums and they had no problems.

My bike frame was larger (60) and that could explain the difference. Anyone has had similar experiences with these wheels? Any advise about what to do to avoid this.
probably not the wheelsDougSloan
Feb 18, 2003 4:44 PM
I've never had problems with them, three sets.

Larger bikes are more prone to shimmy. There are some websites discussing this. I'll see what I can find.

Douig
here's a good discussionDougSloan
Feb 18, 2003 4:47 PM
http://www.spectrum-cycles.com/615.htm
Now I'll have to take the bike to the lab....Bruno S
Feb 19, 2003 7:58 PM
I work for a turbine engine manufacturer and we have instruments that can measure the natural frequency of components. I just have to carefully word the justification for the project so when management sees my Litespeed on the shaker table full of strain gages I don't get fired :-)

I am a metrology engineer and on a daily basis use very sophisticated measuring instruments. I have always wanted to measure a bicycle frame and a set of wheels. Check the alignment of the frame and the roundness and axial runout of the rims.
I'm in San Diego and have a bike you can testDY
Feb 19, 2003 11:14 PM
Hey Bruno I'm in San Diego and I have a bike that speed wobbles above 35 mph. It doesn't do it all the time....it takes something to get it going like a gust of wind then it starts wobbling away. I am pretty sure that it is the top tube because I can reduce it in half by touching the tube with my knees. All the other components are tuned and working well.