# Wahoo Kickr Core 2 & Zwift Cog resistance issue

**URL:** <https://forums.zwift.com/t/wahoo-kickr-core-2-zwift-cog-resistance-issue/668262>\
**Category:** Bugs and Support\
**Created:** [April 29, 2026, 3:50pm UTC](https://forums.zwift.com/t/wahoo-kickr-core-2-zwift-cog-resistance-issue/668262 "2026-04-29T15:50:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Niels\_van\_der\_Steen](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/niels_van_der_steen/32/489872_2.png) [@Niels\_van\_der\_Steen](https://forums.zwift.com/u/Niels_van_der_Steen)\
**Post date:** [April 29, 2026, 3:50pm UTC](https://forums.zwift.com/t/wahoo-kickr-core-2-zwift-cog-resistance-issue/668262/1 "2026-04-29T15:50:19Z")

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I have bought a new Wahoo Kickr Core 2, pre-installed with a Zwift Cog. However, in Zwift my power readings are not accurate at all. Let’s say I start in “Gear 5”, the wattage starts shortly at around 150watts and drops to like 110watts. When you go a into a higher gear, each time, the resistance at the start goes up quite a bit, and then comes down a lot. I can’t seem to get it to be steady.  
I tried looking up firmware updates, but it all seems up to date.  
Also, there doesn’t seem to be a spindown option in Zwift or in the Wahoo app for this Wahoo Kickr Core 2..  
Please help 😃

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**Author:** ![Paul\_Southworth](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/paul_southworth/32/538336_2.png) [@Paul\_Southworth](https://forums.zwift.com/u/Paul_Southworth)\
**Post date:** [April 29, 2026, 6:31pm UTC](https://forums.zwift.com/t/wahoo-kickr-core-2-zwift-cog-resistance-issue/668262/2 "2026-04-29T18:31:32Z")

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Factory spindown is the only manual calibration possible with a Core 2

> [@Zwift ride / Kicker low wattage](https://forums.zwift.com/t/zwift-ride-kicker-low-wattage/667986/4):
>
> You should talk to Wahoo support before doing any mechanical work on the trainer. Modern Kickr trainers only support auto-calibration and factory calibration. This is the factory calibration process if you need it: [https://support.wahoofitness.com/hc/en-us/articles/20511099871634-Factory-spindown-…](https://support.wahoofitness.com/hc/en-us/articles/20511099871634-Factory-spindown-KICKR-MOVE-CORE-SNAP-tsg)