# Cadence keep changing at very low speed

**URL:** <https://forums.zwift.com/t/cadence-keep-changing-at-very-low-speed/534385>\
**Category:** General Discussion\
**Created:** [February 5, 2021, 7:03am UTC](https://forums.zwift.com/t/cadence-keep-changing-at-very-low-speed/534385 "2021-02-05T07:03:48Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![David\_Strappazon](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/david_strappazon/32/413740_2.png) [@David\_Strappazon](https://forums.zwift.com/u/David_Strappazon)\
**Post date:** [February 5, 2021, 7:03am UTC](https://forums.zwift.com/t/cadence-keep-changing-at-very-low-speed/534385/1 "2021-02-05T07:03:48Z")

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Hi all,

I’m using a crappy mountain bike to ride in Zwift.  
I’ve noticed that when I’m at very low speed (like in uphill) and spinning like crazy, cadence is not detected. For exemple it will go from 55 to 32 in like 1s then go back to 45, then 28, etc…it keeps changing even if I’m keeping the same cadence.

It seems to disappear as soon as I reach 55-60 rpm.

Not a big deal but I’m wondering why. Any idea?

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**Author:** ![Steve\_Hammatt](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/steve_hammatt/32/210763_2.png) [@Steve\_Hammatt](https://forums.zwift.com/u/Steve_Hammatt)\
**Post date:** [February 5, 2021, 7:58am UTC](https://forums.zwift.com/t/cadence-keep-changing-at-very-low-speed/534385/2 "2021-02-05T07:58:14Z")

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What is your setup?

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**Author:** ![David\_Strappazon](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/david_strappazon/32/413740_2.png) [@David\_Strappazon](https://forums.zwift.com/u/David_Strappazon)\
**Post date:** [February 5, 2021, 8:11am UTC](https://forums.zwift.com/t/cadence-keep-changing-at-very-low-speed/534385/3 "2021-02-05T08:11:54Z")

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Hi,

A MTB on a Tax Flow Smart. Connexion to a Dell XPS over bluetooth (works very well).

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**Author:** ![Steve\_Hammatt](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/steve_hammatt/32/210763_2.png) [@Steve\_Hammatt](https://forums.zwift.com/u/Steve_Hammatt)\
**Post date:** [February 5, 2021, 8:20am UTC](https://forums.zwift.com/t/cadence-keep-changing-at-very-low-speed/534385/4 "2021-02-05T08:20:15Z")

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DC Rainmaker’s origjnal review of the Tacx Flow Smart called its cadence data “a dumpster fire”. I don’t know if it’s improved since his review, but it’s quite possible it’s just how it is. Some smart trainers, especially less expensive ones, just estimate cadence rather than actually measure it.

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**Author:** ![David\_Strappazon](https://sea2.discourse-cdn.com/gozwift/user_avatar/forums.zwift.com/david_strappazon/32/413740_2.png) [@David\_Strappazon](https://forums.zwift.com/u/David_Strappazon)\
**Post date:** [February 5, 2021, 8:32am UTC](https://forums.zwift.com/t/cadence-keep-changing-at-very-low-speed/534385/5 "2021-02-05T08:32:16Z")

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Yeah, that’s what I thought. Like I said it’s no big deal to me considering that at normal / average cadence it works very well but I was wondering.