# Free Online  Bike Fitting

AI-powered bike fit analysis via webcam, video or photo. Detect causes of cycling pain (knee, back, neck) and get saddle height, setback and handlebar recommendations.

[Start free bike fit](/content/en/evaluation/index.html) [How it works](/content/en#fonctionnement/index.html)

**11,908** analyses completed  **4.8/5** (2068 reviews)

## Cycling pain? You're not alone

### Knee pain cycling

Cause #1: incorrect saddle height. Our bike fit analysis detects this issue.

### Back pain cycling

Often caused by wrong handlebar position or saddle setback.

### Hand numbness

Too much weight on the front? Your back angle and stem length need checking.

In 80% of cases, it's a **bike fit problem**.

## 3 steps, 5 minutes

No appointment or special equipment needed

01

### Questionnaire

Tell us about your practice: road, MTB, gravel? Any pain, your goals.

02

### Capture

Live webcam, video upload, or a simple photo — choose your method. Our AI analyzes your angles in seconds.

03

### Adjustments

Saddle height, setback, handlebars... Get detailed recommendations with numbers.

## How to capture properly

Follow these tips for accurate analysis

1

### Side view

Position the camera perpendicular to your bike at saddle height. The right side (chainring visible) works best.

2

### Good lighting

Use natural light or uniform lighting. Avoid backlighting and harsh shadows.

3

### Fitted clothing

Wear close-fitting clothes (cycling shorts, jersey) for accurate joint detection.

4

### Proper distance

The entire bike and cyclist should be visible with some margin around.

5

### Pedal position

For analysis, place the pedal at bottom dead center (6 o'clock). That's where knee extension is measured.

6

### Stable support

Use a turbo trainer if possible. Otherwise, lean against a wall or have someone help.

## The angles that matter

Our analysis measures the 4 key angles for optimal position. Every degree counts for your comfort and power.

Knee extension

140-150°  
At bottom of pedal stroke

Hip angle  
55-70°  
Pelvis opening

Back angle  
35-50°  
Depends on your practice

Arm angle  
150-165°  
Slightly bent

## Scientific methodology

Our angle ranges are based on scientific literature and professional bike fitting practices

### Knee extension (140-150°)

Measured at bottom dead center, this angle determines optimal saddle height. The Holmes method recommends 25-35° flexion from full extension.

Too low = knee pain, too high = pelvis rocking

### Hip angle (55-70°)

The minimum opening between thigh and torso at top dead center. This angle affects comfort and power output.

Too closed = iliac artery compression, breathing limitations

### Back inclination (35-50°)

The angle between back and horizontal varies by riding style: 40-50° for endurance, 30-45° for road performance.

Lower angles are more aero but more demanding

### Arm angle (150-165°)

Slightly bent arms (~20° flexion) absorb vibrations and keep shoulders relaxed.

Straight arms = neck tension, hand numbness

### References

- Holmes JC, Pruitt AL, Whalen NJ. (1994). Lower extremity overuse in bicycling. Clinics in Sports Medicine.  
- Millour G, et al. (2020). Comparison of static and dynamic methods based on knee kinematics.  
- Bini RR, et al. (2011). Effects of saddle height on pedal force effectiveness.  
- Ferrer-Roca V, et al. (2014). Saddle height effects on pedal forces and kinematics.

These are general reference values. Professional analysis is recommended for complex cases.

## For all cyclists

Road, MTB, Gravel, Triathlon, City, Indoor trainer

## Why is it free?

No reason to pay for a bike fit in 2026

### AI + Human expertise

Our AI was developed and supervised by cycling enthusiasts and biomechanics experts. Angle ranges are based on scientific literature.

### Zero infrastructure costs

Analysis runs 100% on your device. With no servers to maintain, we have no hosting costs, allowing us to offer professional-grade analysis for free.

### Personalized questionnaire

Before video analysis, our detailed questionnaire (riding style, pain points, goals, body type) tailors recommendations to YOUR profile, not generic values.

Same analysis, same precision, $0. Technology makes bike fitting accessible to everyone.

## Frequently asked questions

### Is it really free?

Yes, 100% free. No account to create, no credit card. Your data stays on your device.

### What do I need?

A computer or phone, and your bike. Use live webcam, upload a video, or take a simple photo from the side (right side). Ideally on an indoor trainer.

### Is it as reliable as a pro bikefitter?

It's an excellent first analysis. For complex issues or persistent pain, a professional is still recommended. MyBikeFitting gives you a solid foundation.

### What type of bike does it work with?

Road, MTB, gravel, city, triathlon... The analysis works with all bike types.

## Why I created MyBikeFitting

After months of knee pain on every ride, I searched for solutions. Appointments with bikefitters were expensive and hard to get.

I spent hours on YouTube learning how to adjust my saddle. Trial, error, trial... Until I found the right position.

Today, this experience is automated. AI does in 5 minutes what took me weeks.

Elouan  
Cyclist & Creator of MyBikeFitting

## Ready for your next ride?

5 minutes to optimize your position.

Hours of extra comfort on the bike.

[Start free analysis](/content/en/evaluation/index.html)