I’ve had this issue for a few months now, and my interactions with Zwift Support has been less than helpful, so I’m taking it to the forums to see if anyone else has had similar issues. I’m a ZPower “B” category racer (3.51 W/kg), with above average short term power (but nothing to write home about), but have an auto-category of “A”.
Before anyone responds with explanations regarding the additional Auto-Category thresholds, I understand them. A snip of my ‘fitness’ from my-zwift-com is below. I am 82kg, with my values below:
• zFTP: 312W (3.80 W/kg) – Easily below A threshold
• zMAP: 375W (4.57 W/kg) – Easily below A threshold
• CP (from intervals.icu): Varies between 274W (3.34 W/kg) and 294W (3.59 W/kg), depending on which model is used – Easily below A threshold
BUT… where it gets interesting is when I look at my peak power values within the above Zwift fitness data. Based on those listed W/kg, I can completely understand why it is saying I should be an A, as it has values that far exceed the A thresholds (12 min at 5.6, 20 min at 4.78, 30 min at 4.5, etc). HOWEVER, the weights associated with the 3 minute and over durations are incorrect!! The power values (watts) are correct, but my weight (as calculated by power / W/kg) drops from my 82 kg weight, and varies somewhere between 61 and 75 kg. I hate to say it, but it really makes me question the accuracy of the Zwift and/or AutoCat coding…
[My favorites above are my 1/3/23 race where I am somehow simultaneously 82 kg (5 sec) and 68 kg (5 min), and my 12/20/22 race where I am simultaneously 64 kg (20 min) and 66 kg (30 min)… huh?!?]
(For what it is worth, the ZPower results for the above races correctly capture my weight, and I record my races so it is easy to confirm my weight from those.)
So I post this in the hope that someone has seen this before and/or can provide some assistance in the matter. As I continue (and will continue) to race at my correct weight, racing as an A can be more than frustrating, especially anytime there is a sustained climb.
Appreciate any input. Thanks!