Is this proof of the cadence problem that others had? I was going at a very sedate steady pace as I was doing Alp d'Huez. You can see my speed was pretty regular at 8.8 KPH. Yet the cadence was all over the shop from 40 odd to 136. Not sure I could do 136 even if I tried LOL
Excuse the messy room !!
If you're not using a dedicated cadence sensor, but allowing the trainer to guess the cadence, then I understand that it is likely to be much less accurate when your speed is lower, such as on a long steep climb like d'Huez.
All it has to go on are the peaks and troughs of torque you are producing, to guess when each pedal revolution starts and ends.
Best bet is to get a Garmin magnetless cadence sensor for about £35 and fix it to your crank arm.
Edit: Pretty decent Watts to maintain up d'Huez! How much do you weigh? Most of us are a lot heavier than a typical climber, and it's asking a lot to lift 80 odd kg up such a steep climb. Nearer 70kg makes it a lot easier. Keep at it and not only will the power improve, but the power to weigh doubly so! :-)
P.S. Great knees! :-)
Geoff