Saddle ergonomics

Saddle measuringThe bicycle saddle must fit like a shoe.
Because every person is built individually, a well developed system is needed to solve ergonomic problems as they occur in the moment or as they arise because of e.g. the distance between the sit-bones or, the angle of the back when cycling. Body Scanning CRM allows an application specific setting to adjust saddle ergonomics.

Anatomy and purpose influence the saddle adjustmentAnatomy and purpose

Not only the distance between the sit bones is an is important factor in finding the correct measurements of the bicycle saddle measurements. The angle of the back is also crucial, which can vary according to bicycle type and its purpose.

Pressure distribution in the area of the sit-bones Muscle structures at the pelvisPressure distribution on the saddle

Each cyclist has an individual seating position. This position is will result in different pressure distributions of the sit bone area on the saddle. These pressure distributions merge concentrically in front on the pubic bone. This changes the form as well as the seating and the pressure.

Muscle structures at the pelvisMuscle structure determines the saddle choice

The complex construction of the pelvis is supported by various muscle structures. There are muscle attachments on the inside of the sit bones. If the surface of the saddle is too soft, the saddle padding will deform and allow the sit bones to sink in too deeply. This causes friction between the saddle and the muscle attachments on the inside of the sit bones, eventually leading to irritation. For this reason a soft saddle is not the best choice for those who cycle frequently.

Saddle with a convex shape compresses the sensitive tissue between the sit bones. This can be prevented with ergonomic saddles.Ergonomic saddles prevent tissue compression

A bicycle saddle with a convex shape compresses the sensitive tissue between the sit bones. The compression that you feel can also be measured. An ergonomic saddle shape reduces this tissue compression, resulting in more comfort.

Anatomic differences of the male and female pelvisSex-specific frame design

The illustration on the left shows the rear view of the male and female pelvises. We see the female pubic bone has a shallower angle in relation to the sit bones. By leaning forward it touches the front of the saddle sooner. As a result women are more inclined to sit upright while riding.
Body Scanning CRM Bike takes this difference into account.

The assumption that women require a shorter bicycle frame because they have longer legs and a shorter upper body is wrong. After millions of measurements with body Scanning CRM, it is a proven fact that women are more inclined to sit upright because of the different angle of the pubic bone, not because of the presumably shorter upper body. A special frame design for women makes perfect sense – however, the reason for this is the shape of the pubic bone.

Some facts: Pressure measurement at the saddle

Pressure distribution of different saddle formsThe first illustration shows the degree of tissue compression between the front of the saddle and pubic bone. Red indicates very high pressure, blue very low pressure (pressure equals force per surface unit).

The second illustration shows the pressure reaction of a saddle with a gap in the middle. The areas of high pressure occur on either side of the gap.

The third illustration shows a step saddle from SQ-lab. The red area of high pressure is directly under the sit bones. The force is transferred to the cyclist’s body via the bone, without compressing the sensitive tissue. Discomfort and numbness are minimized. In return, the strain on the periosteum of the sit bones is higher.

Source of the information are research results of the SQ-lab.