Saddle Height Calculator (Hamley)

What is the Hamley Method?

The Hamley method is an alternative approach to saddle height calculation that aims for approximately 25-30 degrees of knee flexion at the bottom of the pedal stroke. This formula is based on biomechanical research and is favored by many professional bike fitters.

Like the LeMond method, this measurement is taken from the center of the bottom bracket to the top of the saddle, following the seat tube angle.

Hamley vs. LeMond: What's the Difference?

The primary difference between these two methods is the resulting saddle height:

• LeMond Method: Multiplies inseam by 0.883, generally resulting in a slightly lower, more conservative saddle height.
• Hamley Method: Multiplies inseam by 1.09, typically producing a higher saddle position with more leg extension.

The Hamley method often results in a saddle height approximately 2-3 cm higher than the LeMond method for the same rider. Neither is inherently "correct" – they are starting points that may suit different riding styles and biomechanics.

How to Measure Your Inseam

Do not use your pant leg length (inseam). Cycling inseam is measured from the floor to your pubic bone.

1. Stand barefoot on a hard floor with your back against a wall.
2. Place a hardback book (or a level) between your legs, with the spine facing up.
3. Pull the book up firmly into your crotch, mimicking the pressure of sitting on a saddle.
4. Mark the top of the book on the wall (or have a friend measure).
5. Measure the distance from the floor to the top of the book.

Which Method Should You Use?

Both methods are valid starting points. Consider these factors:

• LeMond Method: Better for riders who prefer a more upright position, have flexibility limitations, or experience knee pain with higher saddle positions.
• Hamley Method: Often preferred by racers and riders seeking maximum power output and efficiency, or those with good flexibility.
• Try Both: Calculate your height using both methods and test ride at each position. Your ideal height may fall somewhere in between.

Fine Tuning Your Fit

The Hamley method is a starting point. You may need to adjust by ± 5-10mm based on:

• Cleat Position: Cleats positioned further back may require a slightly lower saddle.
• Pedal/Shoe Stack Height: Thicker soles or pedals might require adjustments.
• Flexibility: Riders with tight hamstrings often prefer a slightly lower saddle.
• Crank Length: Shorter cranks (e.g., 165mm vs 172.5mm) require raising your saddle to compensate.
• Riding Style: Time trialists and track riders often prefer higher positions, while climbers and endurance riders may prefer slightly lower.