What do we do about suspected cheats?

A couple of questions…
Firstly, What are the most obvious ways of identifying a cheat? I want to be sure before I accuse anyone.

Secondly, what do you do if you suspect someone of cheating?

A ‘B’ cat race I was in yesterday was won by someone (a 14 year old kid) weighing 36.3kg at 154cm giving him a BMI of 15.3 and was managing to 10w/kg for 15 seconds.

For reference Chris Froome’s BMI is 20.

Just feels a bit off to me.

I had a BMI of 18 and a sprint in the 15s.

It doesn’t sound that off.


He’s a kid. That is likely why his BMI is low. Trust me, my BMI has been much lower than that, and likely still is.

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OK. In which case ‘Chapeau!’

you can report suspicious riders here:

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much lower than 15? :face_with_raised_eyebrow:



I really find it difficult to believe a 14yr old kid only weighs 80lb !! that is a complete stick insect.

Depends a lot on whether they’ve had their growth spurt or not and their natural size. I don’t find it unusual at all.

i weighed 48kg, which is like 105lb, as a 21yo grown adult


At 55kg now, you’ve turned into a real fattie :smile:


I agree with you on this, at the moment it’s a bit fashionable on the races. I am in category A, it’s madness. We have juniors or U23 who arrive on races that are 36kg (for information it is the weight of an 11 year old child) who slam watts like 7w/kg on the flat and uphill… and allow themselves to win the race (with ranking on ZP) and that’s no problem for Zwift. (find the error) what’s next ?

U23 at 36kg seems a bit unusual.

Juniors not so sure.

Most U23 I knew were at least 55kg or so. 23yo at 65kg with my height but more muscular because he trained really hard.

We had another runner in this race, same category, same weight, but he was eliminated 3km from the finish… (DSQ) why did the other one pass? they had put us 20 seconds lol!

He too, for example, there is something wrong for me.


which makes a BMI of 14.5 or even a little less (we are borderline anorexia) after when you see his video it does not indicate anything good … it is still dangerous where he lies and it wouldn’t be the first and unfortunately there are plenty like him on ZP how do you want it to go? It’s always the same problem but during this time we are slapped with poor updates while there are much more important things to settle!! Now Zwift is no longer a game…

Please don’t post rider names.

Hi Gerrie what you do for the forum is great I have nothing to say (; but as soon as we tackle a troublesome subject (unfortunately it is often cheating voluntary or involuntary) it cringes especially for the moderators because this like this subject is not good for the image of zwift etc etc… so if there is a problem it must be reported to the outside by contacting the assistance report the incident etc etc … whereas we all know that it will never be taken into account. For the rest everything is fine I always enjoy riding on this application I can’t wait to try this new feature (Climb portals) (:

It is good that you report it, but there is ways to do it.

Accusing people on a public platform is not the correct way and against the forum rules.

I was nice to only remove the names. :sunglasses:

I don’t want to speculate about any person in particular, but it’s also possible that a very light U23 may be a junior who chafed at the game restrictions on kids. Since age groups aren’t used much for racing purposes, there’s no real down side to inflating your age. No different than adjusting your age on Facebook to get around the child controls.

With my apologies but there are really things to settle in priority. Good day to you (;

The subject of cheating is indeed a recurring theme on this forum. To address your queries directly:

  1. Identifying a cheat is not a straightforward task; there are limited methods at our disposal. These typically involve examining extreme power values, either in magnitude or consistency (it’s rare for anyone to sustain power without fluctuation). Beyond these parameters, we risk stepping into the territory of unfounded assumptions.
  2. Should you encounter suspicious power data, you have the option to report the individual using the companion app. If there’s a detectable anomaly, the platform will flag the user.

In the scenario you’ve mentioned, I urge you to tread carefully. Playing the detective and making assumptions about individuals’ heights and weights (especially when it involves minors) could lead to misjudgments. The reality is that many Zwift users have inaccuracies in their weight data, whether intentional or not. Where then do we draw the line in terms of labeling someone a ‘cheater’? Is it a discrepancy of a kilogram? Does it apply to all riders under 60 kg? Should we compare their profile picture to their weight in Zwift?

It’s a complex issue and can lean toward perverse if not handled tactfully. We have to accept that open racing on Zwift will always be somewhat susceptible to cheating. There will always be uncertainties, whether it’s weight doping, mechanical doping, or traditional doping. If you wish to mitigate these concerns as much as possible, I suggest participating in races that require weight verification and dual power sources. These races may be less frequent, but if fair competition is your top priority, they present the best solution.