Hi
Sorry for my Bad english
I use to doing race in category D that my level
I am about 190 watts but since yesterday i cant do race any more in that category but in C or more
I don t understand why because in all thé races im not in the best zwifter who are more than 200watts
I try to find an explanation. Inl th Help of Zwift
but no solutions
Have you an idea about that ?
Thanks a lot
It means you exceeded the W/kg threshold for C category, which is 2.63W/kg for zFTP, or 3.2W/kg for zMAP. You can find the data for this on the right side of your feed on the Zwift website (https://my.zwift.com/)
The category boundaries are described on this page:
https://support.zwift.com/en_us/pace-group-category-enforcement-rkhtvQuqT
Thanks Paul
I looked my data
Zftp =190
Zmap=208
It will be more intelligent to classify in relation with
Thé result of thé races
May be im gonna increase my weight or not register while 90 days in view to Come back to D instead of C
Otherwise i will never win a race😄
Very true that results should matter. They’ve done some work on that but we don’t know if or when that might happen.
Changing your weight probably won’t downgrade you but it might result in being disqualified.
I believe you don’t need to do anything re your weight. Your zFTP and zMAP are too similar. Your race average was 192w and that took you to a zFTP of 190 and cat C.
I think you are a racer who rides an even pace/power and doesn’t really push your short term (4-6 minute) power. As such your race category power curve is too flat.
Try putting out a maximum 5 or 6 minute effort at, hopefully, around 225w.
There is a chance that will raise your zMAP but reduce your zFTP and possibly take you back to category D honestly.
Thanks Ian
I ll try your solution
Hi @Franck_junior welcome to Forums. thanks for share your concern with us. It’s Juan from Zwift.
In addition to the excellent suggestions our community members have given you. I would like to share with you best practices for keeping your category accurate.
→The more activities you do with regular maximum effort, the more accurate the values will be.
→Do not forget to keep your trainer firmware updated and calibrated to get accurate power readings
→Set correctly your height and weight, please avoid constant changes.
→Avoid sharing your account with someone else.
Ride On.
Bonjour Juan L
Avant de vous répondre j ai d’abord fait 2 courses en catégorie C pour tester et ma conclusion
est la même : je n ai absolument pas le niveau pour courir dans cette catégorie
je le prouve :
3 dernières courses en catégorie D de plus de 15 KMS
19 KMS =12 sur 27 à 1m 41s du 1er
15,7 KMS = 13 sur 52 à 2m 11s du 1er
25 KMS = 95 / 266 à 4 m 47 s du 1er
Donc je suis bien loin des meilleurs de cette catégorie
Cet après midi j ai testé 2 tiny race en C et j ai fini 2 fois dernier / impossible de suivre le rhyhme dès le départ
Pouvez vous me dire quel est l’intérêt ?
je pense que vos algorithmes sont mauvais ou pas adaptés
Les courses de vélo ce n’est pas du judo, le classement UCI d’un
cycliste n est pas par rapport à son poids vitesse.
De plus ayant payé un abonnement je ne comprends pas comment on peut de façon arbitraire m’imposer une catégorie et de ce fait m’interdire
de disputer une course qui correspond pourtant à mon niveau réel , en sachant qu il y a très peu de course libre et de toute façon personne ne s’y 'inscrit
En conclusion vos conseils ne me servent à rien , ce que je veux c’est pourvoir disputer des courses de
mon niveau en CATEGORIE D et m’entrainer comme j en ai envie.
riDe on
If you post screenshots of your power data from your Zwift feed, I might be able to give you more advice about whether you have been categorized incorrectly. As Ian mentioned, the difference between your 5 minute and 20 minute power is too small. This also results in having a higher zFTP value. Go set a 5 minute PR and zFTP will almost certainly go down. It’s possible that could move you to D. Do a ride where you warm up and then ride 5 minutes as hard as you can.
Here’s an example of the data that would be needed if you want more precise feedback:
5 sec335 w4.79 w/kg
12/04/2024 12:49:22
15 sec318 w4.54 w/kg
12/04/2024 12:49:22
30 sec260 w3.71 w/kg
12/04/2024 12:43:39
1 min236 w3.37 w/kg
12/04/2024 12:43:39
3 min213 w3.04 w/kg
12/04/2024 12:43:39
5 min207 w2.94 w/kg
17/04/2024 12:53:40
12 min203 w2.9 w/kg
12/04/2024 12:43:39
15 min200 w2.86 w/kg
12/04/2024 12:43:39
20 min199 w2.84 w/kg
12/04/2024 12:43:39
30 min193 w2.76 w/kg
12/04/2024 12:43:39
40 min174 w2.49 w/kg
28/02/2024 12:52:52
OK this shows that your zFTP is 2.7W/kg. The limit for D category is 2.63W/kg. So your zFTP would need to be 5W lower to to go back to D. Since you have a very small difference between 5min and 20min power, this confirms the advice that Ian and I gave you. Do a 5 min max effort and then check what happens to your zFTP. There is a possibility this may change your category.
thanks Paul
how do you calcul ztfp at 2,7 w/kg ?
is it an average of all the data time + w/fg?
thanks
A little over a year ago, Zwift said they calculate your weight as the average of what you weighed when you set your 3, 5, 12, and 20 minute PRs. I assume this is still true, but that is just an assumption. However your weight is stable across all your PRs, so in your case I’m pretty sure they think you were about 70kg at the time of your PRs.
For each of those PRs, I divide the Watts by the W/kg numbers you provided, and take the average of those weights, then I use that value to divide your zFTP and zMAP numbers to see how it compares to the Category Enforcement boundaries (linked above in this thread).
Today i raced on four tiny races.
Catégories were based on a average speed.
Its a criterion wich corresponds more to cycling than judo criterion.
I Hope Zwift will evolve in this direction for all the races.
that is zwift Bug saying Speed, it was base on V02 max and Zmap. @Franck_junior
Hello! Please explain what numbers justify the transfer to group B, my weight is 101 kg
Zwift ID294510
338 / 101 = 3,347 < 3,36
I can see in your zwiftpower profile that your weight recently changed from 100 to 101.
If you look a bit further down you can see the dates that your peak power numbers were set. Were any of these set when you weighed 100?
There is some sort of weight averaging used in the calculation, and if it’s calculating with your weight at 100.5kg you’re just over the threshold.
With the convoluted way zFTP is calculated, if you can do a 5 minute effort at about 400w it will lower your zFTP by a few watts and you’ll be back under the threshold and a C again.
Hello! Tom, thanks for the detailed answer. The mathematical meaning of your proposed calculation is clear to me, the algorithm for the proposal to improve power for 5 minutes is also clear, but there are details that are incomprehensible to me. In the race on July 8th with a current weight of 101 kg, I improved my times by 5 and 15 minutes at the same time and received a message about the change in FTP from 332 to 333. Based on the results of the race, the category was upgraded to B.
All the best results of 5, 15 seconds and 10, 20, 30, 40 minutes were achieved in June with a weight of 100 kg . After the race on June 26th I received a message that my FTP had changed from 323 to 332. Group C was unchanged.
Results earlier for 30 seconds, 1, 3 minutes in April and May and after for 5 and 15 minutes in July were achieved with a weight of 101 kg.
I’m trying to understand the mathematical logic of transferring to group B. I would be grateful for your thoughts on this topic.
Events are presented in chronological order:
25.04.2024 30 sec 679w 6.72 w/kg 101kg
25.04.2024 1 min 558w 5.52 w/kg 101kg
18.05.2024 3 min 433w 4.29 w/kg 101kg
15.06.2024 5 sec 814w 8.14 w/kg 100kg
16.06.2024 15 sec 756w 7.56 w/kg 100kg
23.06.2024 10 min 358w 3.58 w/kg 100kg FTP 323 to 332
23.06.2024 12 min 357w 3.57 w/kg 100kg FTP 323 to 332
23.06.2024 20 min 351w 3.51 w/kg 100kg FTP 323 to 332
23.06.2024 30 min 337w 3.37 w/kg 100kg FTP 323 to 332
23.06.2024 40 min 329w 3.29 w/kg 100kg FTP 323 to 332
08.07.2024 5 min 391w 3.87 w/kg 101kg FTP 332 to 333 Group C to В
08.07.2024 15 min 362w 3.58 w/kg 101kg FTP 332 to 333 Group C to В
zFTP 338w 338 / 101 = 3,347 < 3,36w/kg (Group C)
zMAP 381w 381 / 101 = 3,772 < 4,1w/kg (Group C)
VO2max 47.2
Based on the reasoning in my previous comment, this is what I get. Note that I cannot swear that this matches what Zwift are actually doing, it’s just based on the last information left in a staff comment on the forum to the best of my knowledge. Go forth and conquer a new 5 minute PR and see what happens.
I’m in a similar boat … weigh 66kg, my ftp is 210-220w (can’t remember exactly). I did my first race a few weeks ago in (recommended) Cat C. Came mid pack, it nearly killed me. I then got upgraded to Cat B, and can’t even finish the races! I hope a more nuanced approach goes live soon (Race Score?).
