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When you want to acquire your first road bike, it’s essential not to make a mistake in choosing the right size. After learning how to choose the size of your bike, today we offer you to discover how to measure the height of a bike saddle.
Why measure the height of a bike saddle?
To be properly positioned on your road bike, it is necessary to properly adjust the height of your saddle. Indeed, an incorrect saddle height – whether it’s too high or too low – can eventually cause pain or even injuries. On the other hand, a correctly adjusted saddle height will ensure you have a better pedal stroke.
To determine the correct saddle height, there are several methods. The saddle height is measured from the bottom bracket axis to the dip in the saddle, keeping the tape measure along the seat post and the crank arm.
How to adjust the height of a bike saddle?
The most well-known method involves measuring the height of your inseam and multiplying this value by 0.885. The result will give you the theoretical height at which you should set your saddle. However, this value can and should be adjusted based on your riding style as it may not suit everyone.
Indeed, a higher saddle will provide more power to the cyclist, while a slightly lower saddle should be preferred for better comfort and increased maneuverability.
The simplest method – but also the least accurate – is to get on your bike and place your heel on the pedal axis. Then, lower the pedal to the bottom dead center, ensuring that the crank arm is aligned with the seat tube. For the saddle to be correctly adjusted, your leg should be fully extended and your knee should not bend. However, several factors can affect this measurement, such as the shoes you use or the length of the crank arms.
The third and final method (known as the Holmes method) is the most accurate – as it takes into account your pedaling style – but it requires some equipment and a bit of help. Place your bike on a home trainer and get on it. Start pedaling and ask a friend to film you for a minute. Then, watch the recording and pause it when your pedal is at the bottom dead center. Overlay a half-square on the image to measure the angle of your knee: if the measurement is greater than 35°, raise the saddle; if it is less than 25°, lower the saddle. According to Holmes, the knee angle should be between 25° and 35°.
How to adjust the setback of the saddle?
Once your saddle height is adjusted, you now need to adjust the saddle setback, which is another crucial criterion.
To do this, get on your bike and position your crank arms horizontally while leaning against a wall or on a home trainer. Use a plumb line and let it drop from the side of your knee. The line should align with the pedal axis. If it falls behind the pedal axis, you need to move the saddle forward; if it falls in front of the pedal, you need to move the saddle backward.
How to adjust the saddle tilt?
Finally, to perfect the saddle adjustment, you now need to adjust the saddle tilt. Theoretically, the saddle should be set horizontally. However, in some cases, and for some cyclists, it may be preferable to adjust the tilt slightly downwards or upwards. Nonetheless, if you make this adjustment, you might feel like you are sliding forward or backward on the saddle.
For leisure road cycling, it can be helpful to slightly tilt the nose of the saddle forward. This will reduce the pressure on the perineum (which can be very painful) and shift more weight to the rear of the saddle at the pelvis level. This is also valid for women.
In time trials and triathlons, on the other hand, the nose of the saddle can be slightly tilted upwards to ensure better stability for the cyclist and thus prevent sliding forward when the arms are on the aero bars.
What to do if I feel discomfort on my bike despite the adjustments?
If, despite these adjustments, unusual pain persists over the kilometers, we recommend opting for a comprehensive bike fitting to obtain adjustments made by a professional, thus achieving the perfect position on your bike.
Now that you know how to measure the height of a bike saddle, how about discovering how to adjust the height of your bike’s handlebars? And finally, do you know how to measure your bike?
