Picture credit to Amy Robinson (2020) and Coyle et al. (1991) Many cyclists focus on pushing harder, but true efficiency comes from controlled, stable movement. A proper pedaling technique enhances power output, reduces fatigue, and prevents injury. 1. The Two-Phase Pedal Stroke Unlike the common four-phase breakdown, an efficient pedal stroke consists of two key phases: 🔹 Active Phase (1 o’clock – 5 o’clock): This is where the work happens. A stable foot-ankle (inclined downward 10–20°), relaxed core, and smooth pedal speed allow the rider to push the pedal forward-down in a motion that aligns with the most effective force direction—tangential to the chainring. 🔹 Recovery Phase (5 o’clock – 1 o’clock): The leg returns to the top passively, retrieving only its own weight with no engagement with the pedal. Trying to "pull up" is inefficient and disrupts pedaling smoothness. 2. Foot-Ankle Position: The Key to Power Transfer A stable foot-ankle is essential for consistent force application. Keeping the ankle fixed and slightly downward (10–20°) optimizes the force direction, ensuring energy is applied efficiently without unnecessary movement. 3. Common Mistakes & How to Fix Them❌ Hammering the pedals → ✅ Maintain a controlled, steady application of force without sudden bursts. ❌ Dropping the heel → ✅ Keep the foot-ankle stable at the correct angle to optimize power transfer. ❌ Uneven crank rotation speed → ✅ Focus on a smooth cadence to avoid inefficiencies and excessive muscle fatigue. 4. The Role of Cadence & Bike Fit
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From a medical standpoint, crank length primarily impacts the hip and knee joints. At top dead center (TDC), the hip reaches maximum flexion, and we need to generate significant force. However, working hard at a joint's extreme range isn't ideal. Shorter cranks reduce hip strain at TDC, promoting better comfort and longevity.
From a performance perspective, shorter cranks engage the quads and glutes earlier and support a more aerodynamic position. The trade-off? Slightly reduced torque, requiring a higher cadence to maintain power. Recently, more athletes have been diagnosed with Flow-Limited Iliac Artery (FLIA)—a condition restricting blood flow to the leg, causing sharp pain and power loss. Extreme aerodynamic positioning is a suspected contributor. High-profile cyclists like Joe Dombrowski, Fabio Aru, Annemiek Van Vleuten, and Carlotta Fondriest have all been affected. Shorter cranks might not be a universal solution, but they can help reduce joint strain and potentially lower FLIA risk—something worth considering for both comfort and performance. SHORTER CRANKS ARE BETTER❤️ |
AuthorMassimo Monticelli, osteopath intrigued by manual therapies with passion for cycling, biomechanics and bike fitting. Archives
November 2025
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