# Discrepancy between my wahoo bolt and Zwift Kickr data

**URL:** <https://forums.zwift.com/t/discrepancy-between-my-wahoo-bolt-and-zwift-kickr-data/507906>\
**Category:** Feedback\
**Created:** [September 24, 2020, 2:47pm UTC](https://forums.zwift.com/t/discrepancy-between-my-wahoo-bolt-and-zwift-kickr-data/507906 "2020-09-24T14:47:59Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Mike\_Rowe1](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/mike_rowe1/32/530428_2.png) [@Mike\_Rowe1](https://forums.zwift.com/u/Mike_Rowe1)\
**Post date:** [September 24, 2020, 2:49pm UTC](https://forums.zwift.com/t/discrepancy-between-my-wahoo-bolt-and-zwift-kickr-data/507906/2 "2020-09-24T14:49:12Z")

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Hi @Suyash_Kumar, the Wahoo Bolt doesn’t know about the virtual world of zwift, going up and down hills, drafting, etc. Just ignore the Bolt. Check out the post below for more explanation.

> [@How Does Zwift Determine My Speed?](https://forums.zwift.com/t/how-does-zwift-determine-my-speed/427729):
>
> How Does Zwift Determine My Speed? For Wheel-on Classic Trainers: Zwift takes the wheel speed broadcast by your speed sensor and the power curve (see example below) of the trainer you select on the Pairing Screen and converts that to virtual watts, also known as “zPower”. Your in-game speed is de…

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