Join Date: Oct 2013
Location: Manchester, UK
Bikes: Madone 6.5 and Cannondale Synapse.
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Gonna have a look at putting this on the mechanics forum.
Basically however, 42mph downhill on my Madone 6.5. Due to short rake or trail, the Madone is prone to the Death Wobble more so than most bikes, my Madone is a 2009/2010 model.
Having read a lot of articles I think people will find a write up by Dave Moulton on shimmy will explain it very well. Bottom line, it's a design issue with geometry but also the rider influences the effects.