Van Rysel D100 - No resistance on SIM mode

Bugs and Support
1

Hi all - I’m creating separated thread for the resistance issue in Van Rysel D100 smart trainer, as Zwift Click connection issues with Van Rysel D100 - this thread was about Zwift Cog and Click integration with that trainer, but more and more comments were about other issue, with the same trainer, but with normal cassettes.

Discussion about this issue was also going on on subreddit r/zwift (sorry can’t use links, but you can search for it)

Issue Summary

The Van Rysel D100 smart trainer is experiencing resistance control problems in Zwift’s simulation mode.

Device Details

  • Trainer Model: Van Rysel D100 (Standard version, not the new “Zwift Edition”)
  • Current Firmware: 0.106 (from other threads it looks like this issue appeared with 0.104)
  • Connection Type: Direct to Zwift, bluetooth + external cadence sensor
  • Affected Mode: Simulation (SIM) mode only

Problem Description

The trainer fails to simulate resistance changes during free rides in Zwift. ERG mode for workouts functions normally, but SIM mode essentially provides no resistance, and no resistance changes.

Technical Analysis

Timing Correlation
The issue emerged approximately one month ago, coinciding with a software update that resolved Zwift Cog and Click compatibility issues. After that there was another software update for the trainer to 0.106 version, that hasn’t fixed the issue. Since then no updates

Behavior Pattern

  • No resistance changes in Zwift’s simulation mode
  • ERG mode functions correctly
  • Resistance simulation works properly in other applications

Working Theory
The problem may be related to virtual shifting implementation. The consistently low resistance suggests the system might be defaulting to the highest virtual cog position. This could be due to Zwift treating the standard D100 and D100 Zwift edition as the same device.

Important Notes

  • Users with the standard D100 should avoid updating to firmware version 0.106
  • The issue appears to be a software interaction problem between Zwift and the trainer rather than hardware-related
  • The problem affects only standard D100 units using regular cassettes
2

Just hopping on this to say I have exactly the same issue, as do many other users going by the Zwift subreddit thread.

1 Like
3

@CDN_Superfunkomatic how is the situation in yours D100? I assume you still have the same issue?

4

same issue

1 Like
5

Still only works in ERG mode on workouts. I haven’t seen any firmware updates and no updates from Decathlon support either. And the issue is only in Zwift, other riding platforms work just fine.

1 Like
6

Ehh

I have written to:

  • Local Decathlon support - they replied that they thought that new firmware resolved all of the issues of D100 (I think they were aware only about D100 Zwift Edition issues). They told me that they will try to contact manufacturer, plus said that I can ofc return trainer (cool but because it’s January there is literally no trainers available in their shops)

  • Decathlon France - it was the contact that was in OneLap app, no reply whatsoever from them, great support :smiling_face_with_tear:

  • Zwift Support - they rather think that it’s just my issue and troubleshooting focuses on user error rather than issue on their side. I mean I get it, I was working on tech support long time ago, but I have provided everything in the first message to prove that this is not a single case ehhh.

And the funniest thing from that is that this is only affecting Zwift, other apps are working fine in SIM mode, so I don’t know, kind of looks like more Zwift issue than Van Rysel/Decathlon.

7

Do you have an external cadence sensor?

8

I have, and it’s also stated in the first message of this thread