I have read quite a bit on heart rates since I bought my heart rate monitor. I did the 220-age deal and came up with 166 for my 54 year old body. Since I started riding in June, I saw my 166 max heart rate after a few rides and weeks later saw 169 and eventually saw 172. Today I was trying to stay up with the racers in the bike club and got dropped at 32mph but not before I was able to hit 176 max heart rate. Now for those of you who understand all the heart rate stuff, my question is Was 176 really my max heart rate all the time and I was just not in good enough shape to reach it til today? I feel great and did not know I had reached 176 til I looked at the info on the watch and then the computer. I am excited that I am able to get 176 max today.