Originally Posted by pcates

you're really over thinking your new toy

the 220- age is a guess at best, it's as likely to be wrong as it is right, but i don't think you can use resting HR to figure out heart rate zones as it's a pretty dynamic number whereas max is a bit more static, there is a sticky thread at the top of this section that will help determine your lactate threshold heart rate; which is more useful (and accurate) for determining your zones than using your max heart rate. I know there is a table in Joe Friel's Training bible that will give you your zones from your LTHR, you may be abe to find it online

hope that helps