Wind power charge controller
First off, remember that voltage on a generator is often expressed as 'open circuit voltage.' While this generator is listed as a 120VDC unit, it's only rated for 65W total, which is only 0.64A @120V; any higher amperage draw will necessarily lower the back-EMF. However, you would still need your components to be rated for the 'static' 120V if you ever expect it to be generating power that you don't use (Unless you add a 'dump circuit' to expend any overvoltage before the back-emf damages your lower-rating device[s]).

Also, according to the specs in that eBay ad:

Power parameters:
50v 1000 RPM
100v 2000 RPM
150v  3000 RPM


So, if you keep it running @ or below 1K RPM spindle speed, your 60V buck-controller should be a le to handle it alright. ;)