I have a quick question about heart rates. I have found my max or very close it and I have a training regament now based on it. Well on Sundays I do a long "endurance" ride. Endurance is defined in the regament as 60% of max heart rate. I have a very hard till maintaining such a low heart rate. should i be using low cadence (70-80 rpm)with a low gear? or mid cadence (75-85) in higher gear? I am having a very hard time with this. can someone help?