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How much will your raining zones change if you use 168 vs 170? That's around 1% difference (2/170) so why don't you start with 168 and go from there.

Having trained with power and HR, my experience has been that HR varies so much that worrying about 2bpm will not assist you in any way.

A drink of coffee before a ride, poor sleep, changes in hydration, etc. will all change your bpm more than 2, so best to pick one and move on.
 
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