iPhone Screenshots


Fizik Spine Concept EVO app is your perfect fitting partner.

An evolution in saddle fitting. Since the introduction of Spine Concept in 2008—fi’zi:k in collaboration with pro cyclists and the University of Colorado have made extensive studies to better understand the biomechanics of cycling in relation to comfort and performance.

Introducing Spine Concept EVO an evolution in connectivity between rider and machine.
Specially designed to help riders find the right saddle for them. The app boasts a number of technical features that help you achieve this with ease of use.


Spine Flexibility and Pelvic Rotation are inextricably linked to saddle comfort — How flexible your spine is and by how many degrees your pelvis rotates determines which saddle and components fit you. Using the in-app rotation feature we can easily calculate your level of flexibility.


Your body weight and power output determine your saddle size: Regular or Large.
Simply perform the in-app calculations to reveal your suggested size.


Based on the results of the test, we will suggest a number of saddles which are perfectly matched for the rider, based on the input data.
For more information about Spine Concept EVO, including our extensive research studies

What's New

Version 2.7

What’s new:
-New Surface Choice feature. You can now choose the saddle surface you prefer: Solid, Versus Evo or Open.
-Updated product range. Discover the new Versus Evo and Open saddles

Ratings and Reviews


Nice idea but inconsistent

I was excited to see this app having always used the fizik arione saddle guessing that I was a snake. I know this is an app and not a spot on scientific test or measurement, so had an open mind. Did it first time, the beep went before I finished bending, repeated the test a Bit faster, bull! Repeated again snake and got another 30degrees of bend, snake, So repeated again, glitch! The app kept repeating the test on its own, not allowing me to get the results, constantly going to calculating, also the calibration tool stopped functioning showing me how much flex had happened. Looks like I will have to delete and re-download it to get it working again. Great idea. Will wait for the glitches to be fixed to get my actual result.

Smaller Platypus

Now I've read the instructions it works

After the epic failure of version 1, I was excited to find an update available today. Unfortunately version 2 is no better.

At least that's what I thought... it turns out I was using it wrong. Having read the instructions, I realised I was holding my phone the wrong way round. When you do it right, the app works just fine. Confirms my saddle choice, maybe I'll get a new one to celebrate.


Clever little app

You need to hold the phone with the screen facing away from your chest when you bend. Spent days holding it the wrong way round and like many thought it didn't work. Did confirm the saddle I already have. Good stuff.


Selle Royal SpA
41.9 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad and iPod touch.
English, Dutch, French, German, Italian, Japanese, Portuguese, Simplified Chinese, Spanish, Traditional Chinese
Age Rating
Rated 4+
© Selle Royal SPA


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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