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Cog Display


This app calculates the gear ratio that you are currently using based on your cadence and your speed. Since it is impossible to determine what chain ring you are using, the app will display all the estimated cogs. For instance if you have a double chain ring 34/50, it will display the estimated cog for the 34 chain ring on the left and the estimated cog for the 50 chain ring on the right. It wo...


Bug fix (1.0.4): On Edge 520, the display was very small. I believe it is now fixed with this version, but it is hard for me to test it since this bug does not appear in the Garmin simulator.</p><p>(1.1.0): Added support for Fenix 3 watch


  • Edge® 1000 Edge® 1000
  • Edge® 520 Edge® 520
  • Edge® 520 Plus Edge® 520 Plus
  • Edge® 820 Edge® 820
  • Edge® Explore 1000 Edge® Explore 1000
  • Edge® Explore 820 Edge® Explore 820
  • fēnix® 3 fēnix® 3
  • fēnix® 3 HR fēnix® 3 HR
平均評価: (30評価)

2018/06/18 | バージョン1.1.0-upd1

Très pratique. Fonctionne super bien !!!

2018/06/09 | バージョン1.1.0-upd1

Very good. Can you update to Garmin 1030?

2018/04/13 | バージョン1.1.0

Great app, keep up the great work!!

Hybrid Noob
2018/03/13 | バージョン1.1.0

Stumbled upon this and gave it a try on the trainer at first - all good and impressive but surely it can't cope with the gradient changes outside? How wrong I was! I'm incredibly impressed with the accuracy, having just returned from a ride over very varied terrain. Within a second or two the display was consistently showing the correct cog, whether I was powering along the flat or out of the saddle while climbing a steep 15% incline. It now has me wondering quite how it calculates the ratio so accurately, in spite of all the gradient changes, using only cadence and wheel speed??? :/ The one exception is, understandably, when you are spinning out going down a downhill. Of course that's a total non issue given the second you are putting out any meaningful power the display corrects almost instantly. All in all a wonderful little app. For someone who occasionally loses track of the gears and glances down at their cassette this is a nice quality of life addition - if gear display is good enough for Di2 this app is good enough for everyone else!

2018/03/16, Clement_Barthes

Hey Hybrid Noob, thanks for the kudos! To answer your question, it calculates the ratio using error minimization. Instead of coding IF LESS THAN but MORE THAN etc... you can compute the error between the measured ratio and the ideal ratio of each cog/chainring pair. Once you've computed all the errors, you rank them and display the lowest one...Tada!!! This approach always give great results . You can check out my code if you click on the source code link, it's very simple if you code a little bit.

Álvaro Carreras Espallardo
2017/10/14 | バージョン1.1.0

Una aplicación indispensable, me encanta ya que no tengo que mirar atrás para ver en qué corona voy. Gracias a esta aplicación me he aprendido de memoria los piñones que tengo.

Paumier Jean-Michel
2017/10/06 | バージョン1.1.0

Presque parfaite... manque juste deux petites choses : le 12ème pignon et pouvoir visualiser le graphique dans Garmin connect. Merci

2017/10/03 | バージョン1.1.0

Fantastic. It works perfectly. Simply and clear. Thank you so much.

Peter Schneiderhan
2017/09/04 | バージョン1.1.0

I miss the Setting for my 1x12 Speed Chainrings

Nico G
2017/08/08 | バージョン1.1.0

Super application ! Fonctionne vraiment bien et rapidement. Un plus serai de pouvoir avoir l'historique des valeurs / log dans l'activité Garmin Connect Merci !

2017/08/02 | バージョン1.1.0

Bravo et le fait de proposer le code source c'est un super exemple. Reste plus qu'à connecter ça avec un Di et on a une boite auto :)

2017/07/25 | バージョン1.1.0

de la balle , hyper réactif , que du bonheur plus besoin de regarder la roue arrière.....

Alberto Vitali
2017/07/20 | バージョン1.1.0

It works very well. I use it on MTB with Eagle 12V, It's possible to add the 12th cog? Thanks!

Antonio Lopes
2017/07/14 | バージョン1.1.0


2017/06/30 | バージョン1.1.0

Very good. I would prefer to see only the active rear cog number (1-10), and much bigger. Once on the trail it is hard to read the small numbers. Good work, thanks!

Θανασης Τολιας
2017/05/27 | バージョン1.0.4

nice but don't work....

2017/05/28, Clement_Barthes

Well it does work for everyone else so there must be a solution to your problem. What's wrong with it?

2017/04/15 | バージョン1.0.4

J'étais un peu septique au début au téléchargement et puis après 3 secondes d'utilisation bluffé marche..... génial quand on voit que pour avoir un capteur certe avec plus d'info mais chez shimano pour le DI2 c'est 80€ génial

2017/04/01 | バージョン1.0.4

Increíble! Aunque me gustaría recomendar una mejora estética en el sentido de que el título de la cuadrícula y el dato ofrecido deberían estar separados, así como aumentar el grueso de la fuente.

Olivier Janssens
2017/03/26 | バージョン1.0.4

Bluffant ! Apporte vraiment une information supplémentaire et intéressante sur le Edge. On passe une vitesse et en moins de 2 secondes le nouveau braquet est affiché à l'écran. Fini de devoir baisser la tête pour regarder sa cassette. Je recommande vivement. Bravo et merci au concepteur pour ce partage.

2017/03/12 | バージョン1.0.4

The app work well, I have the only problem that I can succeed to save my chainring and cog. I modify them but every time I connect garmin 520 i found the stock entries.

2017/03/15, Clement_Barthes

Hi Nico, Sorry about this, that's an issue to address to Garmin actually. I suggest that you use always the same device when you sync your Garmin. For instance, if you use only your phone, you can change the settings on your phone in the Garmin app. If each computer and each phone that you use has the correct settings then it should fix the problem.

Mark Richards
2017/03/04 | バージョン1.0.4

The app worked very well on my Edge 520 (running v10). The label and numbers didn't quite have the same spacing in a five-row page as the built-in data fields but it was close enough. The update to v11 appeared a few days ago and after loading that, something broke with this data field. I deleted and reinstalled it and the issue persists. The small ring field shows only 000 while the large ring field is displaying a number with a decimal place.

2017/03/06, Clement_Barthes

Hi, Sorry about this, I suspect your settings got screwed up. Can you try to reset your gear teeth etc?

2017/02/26 | バージョン1.0.4

Genius! Accurate and responds very quickly to gear change.

2017/02/26 | バージョン1.0.4

All is OK with my edge 1000, 50X34 11 v 11-28 La première appli du genre qui fonctionne !! Thank you

2017/02/25 | バージョン1.0.4

Très sceptique lors de l'installation, j'ai été bluffé lorsque j'ai testé cette application lors de ma sortie du jour. Lors du changement de pignon, 2 secondes suffisent pour que mon Garmin affiche le bon rapport. De plus, chaque fois que j'ai contrôlé le le pignon par rapport à ce qu'affichait mon Garmin, c'était juste! Bravo à son développeur et surtout merci!

Charley Donovan
2017/02/24 | バージョン1.0.4

Works great on my Edge 1000. Didn't need to count the teeth on each cog of my Dura Ace cassette. Shimano publishes that information: Simply click on your cassette and then on "Detailed Product Page" where it lists each "Sprocket Size." Shimano shows detailed cog information for Dura Ace and 105 but, oddly enough, not Ultegra. Possibly the cogs for Ultegra are the same as for Dura Ace (although there's no Dura Ace 11-32)?

2017/02/21 | バージョン1.0.4

So far I have not found any problems with the Edge 1000, works perfectly and is very visible in any size of field.