just another gosling
Join Date: Feb 2007
Location: Everett, WA
Bikes: CoMo Speedster 2003, Trek 5200, CAAD 9, Fred 2004
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You can't calculate the MHR that the zones are based on. There is no formula that works for everyone. You have to measure it. If you warm up on the bike with a pretty good effort for 1/2 hour, then attack a hill at least 10 minutes long going as hard as you dare, and then sprint out of the saddle for the last 200 yards at the top - you'll probably reach MHR, or close enough.
Be that as it may, you still may not be able to ride on the road in zone 1. I can't, and I know my MHR exactly. Too many hills everywhere. If the whole world were flat, maybe. So I do all my zone 1 workouts on the rollers or trainer. Or use a spin bike or exercise bike at the gym if you don't have rollers or trainer.