Callibrating zwift cog please help

Hello, I just got the Wahoo kickr with the Zwift cog. Im using a trek fx2 and everything works great except 2 strange things ive noticed.

  1. When in training mode, specifically the sprinting it has me go up to 250 or so watts. I get there, which seems overly difficult, then after a few seconds it gets so hard to pedel i cant even move standing up.
  2. I find i can average a little over 100 watts on a 20-30 mile ride. If i tried to get to 200+ its ridiculously difficult. Im not sure if that is me, my bike, or something with the calibration but i see people steady at 200+ 300+ watts i just dont see how thats possible the way mine is. Unfortunately i do not have a seperate watt computer to compare. Does this sound right or what can i do to verify or calibrate.

I have performed a spindown in the wahoo app, i do not see the option in the zwift app or companion but after reading the forums some, ill look further. Ill also play with turning off erg mode. I have the bike on the smaller front gear and gear 3 in the rear to line it up. Its a 9 gear rear cassette and i set that, I also have 700-35c tires and set that too.

Any help is greatly appreciated, thank you.

I have the same problem. How did you fix the problem?

Well, I did and I didn’t.

I first found a setting that only appears during a ride. It’s under Menu-> Settings ->Hardware->Trainer Difficulty and set it to the middle. Mine was already there.

The second thing I checked which I do not know if it made much of a difference was making sure my tire size was correct in the wahoo setup.

The last thing that made a huge difference was turning off ERG mode. I know this gets automatically turned on during workouts, it can be turned off on the icon menu in the bottom middle of the screen. So far I have left it on in workouts but off for all other rides. Recently someone told me I should turn it off on workouts as well, but I have not tried that yet.

The last thing I learned from use, which is probably the most important piece, is that there is some calculation Zwift does to determine how hard it will be to pedal. It might be more complicated than this but this is a good guide.

Cadence * X = Watts (where X is how hard it is to pedal.

So, in workouts when the workout wants you to be at a certain Watt, that number is going to be fairly constant, meaning Zwift is going to adjust the X based on your cadence. The slower you pedal the harder it gets ie. 20X=240 is going to be much harder to pedal than 80X=240, until 0*X can no longer equal the Watt and it appears to give up and give you a break. Although it is much more difficult on your physical ability to go faster it is easier to pedal once there, if you can do it. I found standing up is helpful in those most difficult moments.

I also learned not to beat myself up so much about not being able to keep the wattages and cadences of other people who have been cycling for a while and based on what I have found I seem to be right where I should be. I feel Zwift is accurately calculating the numbers. The only thing I can really do to verify that is get a bike computer and take it outside. To tell you the truth, for me, all that really matters is that I’m getting a good workout, and based on the puddle beneath me, I’d say I’m achieving my goal. I’ll see in Spring how much I have improved.

> A new cyclist typically averages around 70-90 RPM and 75-100 watts during a ride, with a good cadence range for beginners being between 70 and 90 RPM, depending on the terrain and ride duration; while power output (watts) will be lower compared to more experienced riders.
*> *
> Key points about new cyclists and cycling metrics:
*> *
> * Cadence (RPM):
*> *
> A beginner usually pedals at a slower cadence, around 60-85 RPM, while more experienced riders may aim for 80-100 RPM.
*> *
> * Power (Watts):
*> *
> New cyclists often average between 75-100 watts during a ride, with the power output increasing as they gain fitness.
*> *
> * Factors affecting power:
*> *
> Body weight, terrain, and training level all play a significant role in determining a cyclist’s power output.

1 Like

Thank you very much for the detailed information and feedback. Things that were question marks in my mind now have their answers.

ERG mode is never enabled unless you’re in a workout, so there is no on or off when doing free rides, group rides, races.

Trainer Difficulty defaults to 50% but that only matters in free rides, group rides, races. It has no effect in workouts. Trainer Difficulty scales gradients so it has no effect on flat roads. It only does anything when you are climbing or descending.