I used to get the speed wobble going around 35+; it almost always had to do with my position. I read some short blog on the speed wobble and they recommended applying downward pressure to the bars, not necessarily gripping harder, just applying more weight to the bars. I tried it and it was very nicely reduced. Later on a 45+ downhill I noticed it came back and the aforementioned trick only worked mostly. I now run a 52mm front wheel and there is NO speed wobble no matter what I am doing with the bars or pressure... I appreciate that... just a thought. The previous wheels were Ksyrium Elite wheels...FWIW