How to choose the right crank arm length: the trend towards shorter crank arms explained

Crank arm length is a crucial element in your bike setup, influencing both your comfort and your performance. In recent years, a notable trend towards adopting shorter crank arms has emerged, among both professional and amateur cyclists. But how do you determine the ideal length for you? This article explores the benefits of shorter crank arms and provides advice based on scientific data and recent news.

Current trends among the professionals

Well-known cyclists are now adopting shorter crank arms.
Tadej Pogačar was one of the first to light the fuse! A two-time Tour de France winner, he uses 165mm crank arms, despite being 1.76 m tall. This choice allows him to maintain a high cadence and reduce the strain on his joints, thereby improving his performance during intense races.

Even more extreme, over at Visma Lease a Bike, in 2025 Jonas Vingegaard is riding 150mm crank arms, and as for the rest of the team: not a single rider has anything longer than 165mm!

Why opt for shorter crank arms?

Reduced biomechanical strain

One of the main benefits of shorter crank arms is the reduction in strain on the joints, particularly the knees and hips. By reducing crank arm length, flexion angles are less pronounced, which can be beneficial for cyclists suffering from joint pain or with limited mobility. This setup also allows for smoother power transmission, particularly during prolonged efforts or in the time trial position.

Improved cadence and aerodynamics

Shorter crank arms encourage a higher pedalling cadence, thereby spreading the muscular load more efficiently and delaying fatigue. In addition, they allow a more aerodynamic riding position by reducing the height to which the knees rise during the pedal stroke, which is particularly advantageous for time trials or solo efforts.

How do you determine the right crank arm length?

The choice of your crank arm length must take several factors into account, in particular your morphology, your pedalling style and your cycling goals. A commonly used formula consists of multiplying your inseam length (in cm) by 0.216 to obtain an estimate of the crank arm length in millimetres. However, this theoretical approach must be adjusted according to your flexibility, your position on the bike and any specific biomechanical constraints.

0.216 x inseam = crank arm length

For the geekiest among you, variable-length crank arms have even been created, allowing the length to be varied from ride to ride in order to determine the one that suits you best. The brand appleman, for example, sells a crank arm whose length can range from 100 to 175, plenty to find what you're after!

Consulting a professional

The surest way to choose your crank arm length remains to call on a bikefitting professional. A personalised analysis will make it possible to assess the potential impact on your performance and your comfort, and to ensure that the change will be beneficial in the long term. In addition, an adaptation period is often necessary for your body to get used to the new setup.

Conclusion

The trend towards shorter crank arms is supported by biomechanical benefits and improvements in performance. However, the choice of the ideal length must be personalised, taking into account your morphology, your riding style and your goals. A consultation with a professional and an adaptation period are essential to optimise the benefits of this change.

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