The Fundamentals of Filming Your Pedal Stroke

If you're using remote fitting services or AI analysis tools, your video quality is the most crucial variable. A few simple shooting techniques can elevate your footage from amateur clips to professional-grade data.

1. Camera Stability is Non-Negotiable

Motion analysis software measures subtle joint angles, which can be thrown off by the slightest camera shake.

• Use a Tripod: Always use a tripod or prop your camera on a rock-solid surface (e.g., a stack of books or a chair) to eliminate camera movement.
• Avoid Zooming: Set your distance correctly and avoid using digital zoom, which degrades quality and introduces potential distortion.

2. Positioning: The Right Angle for the Job

Analysis requires two primary views, each with specific setup requirements:

A. Side View (Lateral Analysis)

This view assesses saddle height, fore/aft position, and overall reach.

• Camera Height: Place the lens level with the center of the crank axle (the middle of the pedal stroke). This height minimizes distortion that affects hip, knee, and ankle angles.
• Camera Distance: Position the camera approximately 3 to 4 meters (10-13 feet) away from the bike to achieve a 'flatter' image, which provides true geometric measurements.

B. Front View (Frontal Analysis)

This view is critical for checking knee tracking (lateral movement) and foot stability.

• Camera Height: The lens should be level with the center of the knee joint or slightly lower at the crank axle.
• Camera Distance: Place the camera directly in front of the bike, centered on the front wheel, at least 3 meters away.

3. Optimizing the Environment

• Lighting: Ensure the room is brightly and evenly lit. Avoid strong spotlights or shadows. Never film with a window or bright light source behind the rider (backlighting).
• Clothing: Wear snug, contrasting cycling kit. Loose shorts or baggy jerseys obscure the hip and knee joints, making AI detection difficult.
• Frame Rate: Record at a minimum of 21 frames per second (fps). This high frame rate allows the analysis software to capture smooth motion and accurate maximum/minimum angle points during the fast pedal stroke.
• Duration: Record a continuous shot of at least 45 seconds to ensure the rider is pedaling consistently and capture multiple full pedal cycles.