Using an optimized crank length can significantly improve comfort and performance.

Input your exact height to calculate a baseline crank length.
This gives the tool a starting point based on average human proportions.

Select the option that best reflects your proportions:

This adjusts the calculation up or down by several millimeters to match your unique biomechanics.

Choose between:

Your discipline affects crank preference:
performance riders benefit from slightly shorter cranks, while touring riders may prefer more leverage.

The tool instantly calculates:

A dynamic graph (canvas chart) highlights your ideal position on the 150–180mm scale.

Use the recommendation to:

For most riders, switching even 5mm can make a noticeable difference.

The Crank Length Selector is:

It gives riders confidence when choosing crank arms — no more guesswork.

• Cadence: Shorter cranks allow smoother, higher cadence.
• Knee Stress: Longer cranks increase knee flexion and can cause discomfort.
• Power Delivery: The right length improves biomechanics and reduces wasted energy.
• Fit & Handling: Riders with shorter/longer legs benefit from tailored crank arms.

• Short legs compared to torso
• Average proportions
• Long legs compared to torso

• Casual / Fitness / Urban riding
• E-bike commuter
• Performance / Road / MTB
• High cadence / Low torque spinning

• Optimal crank length
• Acceptable range
• Biomechanics-based reasoning

• Choose the correct crankset size
• Upgrade from your current length
• Improve knee comfort
• Match your e-bike’s geometry
• Optimize spinning cadence

• Niche but highly valuable
• Perfect for enthusiasts, bike fitters, and e-bike hobbyists
• Simple to use yet biomechanically meaningful
• Better than generic size charts