Suspension analysis

The design and kinematics of the rear suspension have a strong impact on your bike performance. Kinematics can affect how efficient your bike pedals, how well your bike absorbs bumps and big impacts, and how your bike handles with braking.

From XC, Enduro or Downhill, we all have different riding styles and we all ride on different types of terrain. Not every bike are optimized for your style. To get the most of your bike it is crucial to match the kinematics with your riding style.

Here you can request my technical knowledge to analyse rear suspension designs and to help  finding the kinematics that fits you.


My name is André, from Portugal, and since the late 90's I have a passion for mountain-bikes, suspensions and physics. 


I created the YouTube channel "andrextr" as an hobby to freely share my passion and knowledge about MTB suspension. During this time I collaborated with some bike manufacturers as an external R&D consultant and as a trainer. I also collaborated with technical reviews for a main MTB online magazine. 

Here, I provide tailored technical services for riders and companies. 

Have fun! 



Are you spending a fortune on a new mountain-bike? Are you not sure if it has a progressive linkage or good pedaling efficiency?

Do you want to know whether your bike will work well with a coil shock or an air shock?

Or are you a Local Bike Shop owner who wants to provide more added value to customers?


Don't worry, let me help you!


Basic bike analysis

25 €  (approx. 27$ USD)

Request any full-suspension bike.
You will get a two-page PDF file containing:

- Analysis of pedal efficiency (Anti-Squat);

- Analysis of progressivity (Leverage Ratio);

- Comment about suitability to coil or air shocks;

- Comment about suitability to your riding style;

- Explanation of concepts with a easy-to-understand and practical language.


For multiple bikes: 10% discount

Jumping Mountain Biker

Advanced bike analysis

40 €  (approx. 45$ USD)

Request any full-suspension bike.

You will get a four-page PDF file containing:


- Analysis of pedal efficiency (Anti-Squat)

- Analysis of progressivity (Leverage Ratio)

- Analysis of braking (Anti-rise)

- Analysis of axle-path, kickback and chain-growth

- 5 graphs for anti-squat, anti-rise, chain-growth, axle path and leverage ratio

- Comment about suitability to coil or air shocks.

- Comment about suitability to your riding style and terrain

- Explanation of concepts with a easy-to-understand and practical language

For multiple bikes: 10% discount

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Training & consultancy

Ask for a quote

Do you own a Local Bike Shop?

I can offer tailored online courses to your staff, using real examples of bikes you sell. Trained employees can bring value by offering better guidance to customers. 

Are you a bike manufacturer?

I can offer consultancy services for suspension design and kinematics optimization.

Do you want to promote your bike?

I can make independent bike analysis videos on my youtube channel.

- and more...


Frequently asked questions

How can I request a bike analysis?

1. Fulfill the contact form with the pretended bike (brand, model and year). You can add comments about your riding style (optional). 2. I will first check the feasibility of the request. 3. If feasible, you will receive a confirmation e-mail accepting the request with payment details (PayPal). After payment you will receive the analysis report (1-3 working days). 4. If for any reason the request is not feasible, I will let you know in the confirmation mail and you won't pay, obviously. Quality and accuracy are key!

Can I request multiple bikes?

Yes, I can make an analysis comparing multiple bikes. Send me all the pretended bikes models in the form. You will receive the confirmation email with a 10% discount for multiple bikes.

Payment methods

Currently I am only accepting payments with PayPal or


Although I only accept services that I know I can complete them successfully, if for any reason I cannot complete the job or if you have fair reasons to be unsatisfied with the quality of the service, I will get the service done again, refund partially or refund totally.

Can I request analysis videos?

You will receive the analysis in a PDF format. Videos take considerably more time to prepare (at least a full working day), and it is not feasible to answer all requests with videos. However if you are a company that wants to promote a bike with an independent analysis video, please contact me.

I have a Local Bike Shop. How can you add value to my business?

Customers really value when retailers offer them expert advice and are more likely to shop with you and become loyal if you offer a better experience than your competitors.
I can provide an online tailored training about most important topics in suspension kinematics to you and to your employees. With easy to understand language and with real examples of bikes you sell. With this knowledge you can impress your customers and offer better advice in selecting a bike that mets their riding style. For instance, depending on customer, you can advice for a linear or for a progressive linkage, or even a digressive one!

Are you going to make more YouTube videos?

Yes, I really enjoy to make videos and I want to make more. But lets be honest here, I am not sponsored and some of these videos took +100 hours to prepare. Without support this is simply not sustainable at long-term.Instead of asking for crowdfunding or donations (which I don't feel comfortable with), I decided to instead monetize my services and knowledge. It's a win-win scenario: 1) You receive a tailored and detailed answer to your question; 2) I get support and motivation to do more videos and; 3) more new quality videos will bring more potential customers to the site. It's a sustainable circle!

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FOX Service Center Iberia

At FOX Service Center we seek for excellence in service and, to ensure it, we rely on the experience from the best technicians.

The training is a fundamental tool to acquire the skills, and the cooperation with André has proven to be crucial for the knowledge update by our technicians team.


Brandon Turman,

Vital MTB

André's breadth of suspension knowledge and analysis skills have been an excellent compliment to our mountain bike reviews. Only with hard numbers can you get the most clear and informed picture of bike performance.


MBR Magazine

"Send Andre your bike details and he'll get back to you with all of the info"

Read more here



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