Originally Posted by
Drew Eckhardt
If you can ride in Zone 5 for an hour you're defining your zones wrong and if it wasn't physically painful they're way off.
I was responding to DDF's link which is a 6 zone system. So everything you said after this needs to be revised in that context.
I've also seen 7 zones-- 1 through 4 and then 5a, 5b, 5c-- for whatever it's worth.