jumped on the trainer last night to go through a spinervals 'aero basebuilder 1' dvd with a shiney new cadence meter and found that i'm way below the cadence i should be working at in order to keep my heart rate in the correct training level.
to get the correct cadence/bpm combination i found i had to go from the specified big ring/15 to small ring/21. to use the correct gear and maintain correct bpm my cadence drops from the required 90 to around 70 if that.
anyone got any advice?

