Charging Batteries from DC Bike Generator
Please confirm how you are going to rotate the motor. And at what speed/rpm?
The motor is of quite high power &amp; you can get the desired voltage range by rotating it slowly also. My suggestion is to use a 24v battery or 2x12v as the nominal voltage is touching 30volts. I suggest to use a solar charge controller of 10A which supports both 12 &amp; 24 volts (can be used for multiple applications if not giving desired output). Be sure to check input voltage range before buying charge controller or try to add a LED voltmeter/rpm meter for input so that you can avoid over voltage. If you can share what is going to run in the battery, i can suggest better solution. How much watt is the load or how much current the load required?
Edit:  You can use dummy load (search online) so that over voltage can be avoided. Or hook up a LED with zinner diode &amp; some resistors so that light will glow if the voltage is exceeding charge controller's input range &amp; you can stop pedaling. Best option is to choose a charge controller which has auto shutdown feature for your ease &amp; project safety.