I read somewhere that to measure heart rate, you substract your age from 220. 220 is apparently the upper treshold. Since I started recording my HR at the end of every ride, I have never been over 165. To me that is my max according to the rule of 220 - age=max heart rate.
Here is my source, http://www.webmd.com/content/tools/1...heart_rate.htm

To the OP, the rates you posted are within your capability.