# ERG Mode and Tacx Flux S, Power2Max, controlling with lower wattage **URL:** \ **Category:** Equipment\ **Created:** [December 16, 2018, 3:39pm UTC](https://www.trainerroad.com/forum/t/erg-mode-and-tacx-flux-s-power2max-controlling-with-lower-wattage/8012 "2018-12-16T15:39:57Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Martin\_Peinsipp](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/martin_peinsipp/32/6681_2.png) [@Martin\_Peinsipp](https://www.trainerroad.com/forum/u/Martin_Peinsipp)\ **Post date:** [December 16, 2018, 3:39pm UTC](https://www.trainerroad.com/forum/t/erg-mode-and-tacx-flux-s-power2max-controlling-with-lower-wattage/8012/1 "2018-12-16T15:39:57Z")
Hello! **I am using the following equipment:** - TACX Flux S, - Power2Max Powermeter - Win 10-Laptop with an Ant±Dongle and an USB extension-cable (Dongle is placed right next to the trainer). - Most of the workouts I am doing with the smaller ring in front (34) and about 23-25-27-30 at the back. I have the following issue: During a SST-Training the software seems to have a problem, when the wattage is dropping from, for example, 190 watt (sst-intervall) to a cool-down-part with about 85 watt. The wattage drops, but it only drops to about 110/120 watt. Now, when I am switching from ERG-Mode to RESISTANCE-Mode and back to ERG-Mode manually, everything is fine. Now the software addresses the 85 watt and the trainer can “hold” them. From my point of view it is not related to the “wattage-floor” of the trainer, because if I am switching between the modes manually, everything is fine. All the time my cadence is between 85 and 95. Today I did another test (same gear-set: front 34, rear 27): - Warm up for 5 minutes with 85 watt (85 cadence): Everything is fine, the software addresses the wattage and the trainer can hold the 85 watt. - 10 Minutes intervall with 195 watt (85 cadence): Everything is fine - 5 Minutes cool-down with 85 watt (85 cadence): Now it happens, the wattage drops only to about 120 watt. Now shifted from 27 to 30 (rear), the wattage decreased a little bit to about 105 watt. But the wattage did not decrease to the 85 watt. → Now I switched to RESTIANCE-Mode and back to ERG-Mode manually. The everything was fine, the software addressed 85 watt and the trainer did id as well. Right after this, I did similar tests with Zwift. And I did not have any issues like this with Zwift. For me it looks like, that trainerroad (in combination with the TACX FLUX S) has an ERG-Issue. Do you have any ideas, what I can do (it is a pain to switch permanently the mode during a SST-Training _g_). Best regards Martin ---
**Author:** ![lebowskii98](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/lebowskii98/32/6686_2.png) [@lebowskii98](https://www.trainerroad.com/forum/u/lebowskii98)\ **Post date:** [December 16, 2018, 4:08pm UTC](https://www.trainerroad.com/forum/t/erg-mode-and-tacx-flux-s-power2max-controlling-with-lower-wattage/8012/2 "2018-12-16T16:08:32Z")
I feel your pain. I bought the Tacx Flux on offer not so long ago. One if my gripes was the high wattage floor. I guess the S is a newer version so it’s strange the wattage floor changes between intervals. Mine was around 120-130 in the middle of the block. Always had to change down. ---
**Author:** ![Martin\_Peinsipp](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/martin_peinsipp/32/6681_2.png) [@Martin\_Peinsipp](https://www.trainerroad.com/forum/u/Martin_Peinsipp)\ **Post date:** [December 16, 2018, 5:35pm UTC](https://www.trainerroad.com/forum/t/erg-mode-and-tacx-flux-s-power2max-controlling-with-lower-wattage/8012/3 "2018-12-16T17:35:15Z")
Hello! Well, I think it is not related to the wattage-floor, because at the beginning of a workout the 85 watts are hold perfectly. And during a workout, if I switch between the modes manually, the 85 watt are held perfectly as well. It is only an issue, if I do not switch manually. Maybe it is related to the wattage-floor in combination with the temperature of the device (because mostly the issue occurs after a time-period and never at the beginning of a workout). BUT on the other hand, the question is, why does this not happen with Zwift? Best regards Martin ---
**Author:** ![dmytrovasylyev](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/dmytrovasylyev/32/53544_2.png) [@dmytrovasylyev](https://www.trainerroad.com/forum/u/dmytrovasylyev)\ **Post date:** [May 28, 2020, 5:46pm UTC](https://www.trainerroad.com/forum/t/erg-mode-and-tacx-flux-s-power2max-controlling-with-lower-wattage/8012/4 "2020-05-28T17:46:16Z")
have you solved the issue? ---
**Author:** ![caleidoscopic](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/caleidoscopic/32/12893_2.png) [@caleidoscopic](https://www.trainerroad.com/forum/u/caleidoscopic)\ **Post date:** [November 6, 2020, 12:07pm UTC](https://www.trainerroad.com/forum/t/erg-mode-and-tacx-flux-s-power2max-controlling-with-lower-wattage/8012/5 "2020-11-06T12:07:47Z")
Hi! I’m new with TR and I’ve been looking for information on this subject I have the Tacx Flux S and the 4iiii crank and I have the same feeling I have used ERG with Zwift and The Sufferfest and it had not happened to me The rest interval never gets you down to the marked area Any suggestions? ---
**Author:** ![caleidoscopic](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/caleidoscopic/32/12893_2.png) [@caleidoscopic](https://www.trainerroad.com/forum/u/caleidoscopic)\ **Post date:** [November 7, 2020, 8:46am UTC](https://www.trainerroad.com/forum/t/erg-mode-and-tacx-flux-s-power2max-controlling-with-lower-wattage/8012/6 "2020-11-07T08:46:10Z")
I answer to myself I have already read several forum posts and blog articles about this. I am clear about the advantages and limitations of the ERG and the roller. And this also clarifies many things > **[Garmin Tacx Indoor Bike Trainers](https://www.garmin.com/en-US/c/sports-fitness/indoor-trainers/)** > > Garmn Tacx offers a variety of high-quality bike trainers including a basic trainer, a fully interactive smart trainer, bike rollers, and much more.