# Fluctuations in speed

**URL:** <https://forums.zwift.com/t/fluctuations-in-speed/2701>\
**Category:** Archived: General Discussion\
**Created:** [November 23, 2017, 8:49pm UTC](https://forums.zwift.com/t/fluctuations-in-speed/2701 "2017-11-23T20:49:10Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Mark\_Dunford](https://avatars.discourse-cdn.com/v4/letter/m/e480ec/32.png) [@Mark\_Dunford](https://forums.zwift.com/u/Mark_Dunford)\
**Post date:** [November 23, 2017, 8:49pm UTC](https://forums.zwift.com/t/fluctuations-in-speed/2701/1 "2017-11-23T20:49:10Z")

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My speed keeps dropping to 4 or 5 kph despite how hard I’m working, I’m getting very frustrated.

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**Author:** ![Paul\_Allen](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/paul_allen/32/414916_2.png) [@Paul\_Allen](https://forums.zwift.com/u/Paul_Allen)\
**Post date:** [November 23, 2017, 8:53pm UTC](https://forums.zwift.com/t/fluctuations-in-speed/2701/2 "2017-11-23T20:53:44Z")

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Are you going up a virtual hill at that time and what is your W/KG at the time. More info is needed.

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**Author:** ![Paul\_Allen](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/paul_allen/32/414916_2.png) [@Paul\_Allen](https://forums.zwift.com/u/Paul_Allen)\
**Post date:** [November 23, 2017, 8:56pm UTC](https://forums.zwift.com/t/fluctuations-in-speed/2701/3 "2017-11-23T20:56:49Z")

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What devises are you using?  
Zwift determines your in game speed based on watts, weigh, virtual elevation changes, drafting and ingame bike used.

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**Author:** ![Mark\_Dunford](https://avatars.discourse-cdn.com/v4/letter/m/e480ec/32.png) [@Mark\_Dunford](https://forums.zwift.com/u/Mark_Dunford)\
**Post date:** [November 23, 2017, 10:13pm UTC](https://forums.zwift.com/t/fluctuations-in-speed/2701/4 "2017-11-23T22:13:08Z")

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Hi, thanks for the reply. I’m doing between 125 and 140 watts, my weight is set up at 100kg. I’m not drafting on anyone. As far as virtual elevation, I have a range to f up to 8 on my turbo trainer and normally work on 3 or 4. I’m not aware of the in game bike,&nbsp;

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**Author:** ![Paul\_Allen](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/paul_allen/32/414916_2.png) [@Paul\_Allen](https://forums.zwift.com/u/Paul_Allen)\
**Post date:** [November 23, 2017, 10:30pm UTC](https://forums.zwift.com/t/fluctuations-in-speed/2701/5 "2017-11-23T22:30:09Z")

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If you are going up a virtual hill within Zwift your speed will decreas and if you are going down a hill within Zwift your ingame speed will increase, don’t compare speeds within Zwift to any other apps or devises they don’t know about the virtual elevation changes

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<div class="post-metadata">

**Author:** ![Mark\_Dunford](https://avatars.discourse-cdn.com/v4/letter/m/e480ec/32.png) [@Mark\_Dunford](https://forums.zwift.com/u/Mark_Dunford)\
**Post date:** [November 23, 2017, 10:31pm UTC](https://forums.zwift.com/t/fluctuations-in-speed/2701/6 "2017-11-23T22:31:50Z")

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Ok, thanks, I’m concerned thought my speed is dropping tight down to as low as 4 kph and whatever I do I can’t speed up

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**Author:** ![Paul\_Allen](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/paul_allen/32/414916_2.png) [@Paul\_Allen](https://forums.zwift.com/u/Paul_Allen)\
**Post date:** [November 23, 2017, 10:39pm UTC](https://forums.zwift.com/t/fluctuations-in-speed/2701/7 "2017-11-23T22:39:38Z")

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Sounds normal if you are putting out those watts and you weight is entered correctly and we’re going up a hill within Zwift.