Originally Posted by
SylvainG
He did say. He said he used the 220-age formula. For me this is really bogus. My MHR is 18 bpm higher than the value found by that formula.
Yes, I missed that. And I agree with you - it's a bogus formula - meaningless.
So we have no idea whether the OP is topping out at Z4 or something else.
OP -just keep riding, don't worry about whether or not you are in Z4 or Z5.