Hi there, I have a rather complicated question… at least I think it is. Typically I ride on routes with not all too much gradient changes. I ride based on my HR zones and have found the corresponding wattages that I need to ride.
However yesterday I rode on Alpe du Zwift (large gradients) and had to shift to the small front chain ring. I still rode based on HR but the corresponding wattage was significantly higher than expected (50-60 watts more). Do you have an explanation for this?
On large chain ring HR 125 at a cadence of 95-100 is round 190-200W, yesterday on small chain ring climbing Alpe du Zwift HR 123 at a cadence of 85-90 wattage shown was 240-260W. My FTP is set at 262W (corresponding HR should be around 152).
Trainer is a Tacx Vortex smart.
Any help would be appreciated