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Question

How the maximum speed is calculated in strava

A
Forum|alt.badge.img+2

Hi mates,

I try to manually calculate the max speed of a small segment and I don’t get the same value as show on strava.

I joined the GPX. (gpx.txt) or the JSON point bellow can be used to replicate it.

 

{ lat: 46.2873437, lon: 7.4867482, time: "2025-03-13T17:26:35Z" },
{ lat: 46.2873455, lon: 7.4867516, time: "2025-03-13T17:26:36Z" },
{ lat: 46.2873491, lon: 7.486762, time: "2025-03-13T17:26:37Z" },
{ lat: 46.2873544, lon: 7.4867875, time: "2025-03-13T17:26:38Z" },
{ lat: 46.2873642, lon: 7.4868367, time: "2025-03-13T17:26:39Z" },
{ lat: 46.2873739, lon: 7.4868956, time: "2025-03-13T17:26:40Z" },
{ lat: 46.2873885, lon: 7.4869504, time: "2025-03-13T17:26:41Z" },
{ lat: 46.2874045, lon: 7.4869974, time: "2025-03-13T17:26:42Z" },
{ lat: 46.2874034, lon: 7.4870324, time: "2025-03-13T17:26:43Z" },
{ lat: 46.2873929, lon: 7.487055, time: "2025-03-13T17:26:44Z" }

So in my test I get. Between two point (4 and 5) I have a distance of : 4.65 meters. in one second so 16.74km/h. The stava move show me a max speed of 14.3km/h

 

So I am calculating it wrong ? Or does Strava use some smoothing technics ?

Cheers

Alex

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3 replies

Jan_Mantau
Superuser
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  • Jan_Mantau
  • Superuser
  • 905 replies
  • March 21, 2025

I only get 3,9 meters between points 4 and 5 and with this 14.3 kph is correct:

 

Jana_S
1 person likes this
  • Jana_S
    Jana_S
A
Forum|alt.badge.img+2

Thank for the quick feedback. 

Sorry I meant between point 5 and 6 (I add the array index in my head my bad 🤣)

So :  4.65 meters →  16.74km/h


 

A
Forum|alt.badge.img+2

​@Jan_Mantau Thanks for the quick feedback ! 😀

Sorry I had the index array in the head.🤣 I mean from point 5 to 6 of the list. 

{ lat: 46.2873642, lon: 7.4868367, time: "2025-03-13T17:26:39Z" },
{ lat: 46.2873739, lon: 7.4868956, time: "2025-03-13T17:26:40Z" },

So 4.653 meter →  16.74km/h

 

A
1 person likes this
  • A
    AlexFlexCodex

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