# Climbing on non-smart trainer

**URL:** <https://forums.zwift.com/t/climbing-on-non-smart-trainer/98253>\
**Category:** General Discussion\
**Created:** [August 28, 2019, 8:28am UTC](https://forums.zwift.com/t/climbing-on-non-smart-trainer/98253 "2019-08-28T08:28:33Z")\
**Posts on this page:** 1\
**Showing post:** 14

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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:** [May 2, 2020, 11:35am UTC](https://forums.zwift.com/t/climbing-on-non-smart-trainer/98253/14 "2020-05-02T11:35:41Z")

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> [@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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