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I found it is called speed wobble. It can come from loose headset, loose spokes, bad tire, misaligned wheel, too-high saddle (http://www.roadbikerider.com/advanced-skills/speed-wobble), geometry and physiology might be the problem (http://cyclingtips.com.au/2011/03/speed-wobble-when-the-bike-shakes-its-head/). One way to avoid it is to hold the top tube in ...


If you would like to change to the FC-M660 cranks you are going to have to purchase a new hollowtech ii compatible bottom bracket and change everything. The octalink is a cartridge bottom bracket and the hollowtech ii is an external bearing bottom bracket. The cranks aren't compatible between the two interfaces. You can get away without a crank bolt as this ...

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