The Sit Bones, “Sitz Bones” Sitting Bones or Ischial Tuberosity
The Sit Bones Measurement
Sit Bones and Cycling Position
How Often do You Stop Pedaling?
Industry Sit Bone Research
- Ischial Bone Study (sit bone width): Selle found a wide variation of sit bone widths from their 240 participants and subsequently created 3 saddle widths based on the averages in the study. The width was measured at the 90 degree spine angle and they created another device (seen above with the teal gel pad) to assign a saddle based on sit bone width. The most interesting part of this study was this precious gem mentioned in their research, “Ischial (sit bone) distance varies according to riding position due to the v-shape pelvic anatomy. In the more inclined spine angle, the distance will become shorter as the contact points move from the seat bones toward the pubic bones.” Result: if you ride with a 90 degree spine angle, then the sit bone measurement may be somewhat accurate (more on this later). If you ride in any other position(most cyclists) it’s likely that the contact point will move forward away from your sit bones, which, they do not mention, renders sit bone measurement (in the 90 degree form) for most enthusiast and competitive cyclists completely irrelevant.
- Gender and Shape Study: Although this does not connect specifically with sit bone measurement, it does impact our point about spine angle. 66 participants were tested using specific pressure mapping with 64 different sensors at the 30, 45, and 60 degree angle.
- Selle assumed that the pelvic position on the 60 and 90-degree would have the same result. This is likely debatable depending on the rider but certainly, individual preference and riding style will impact saddle comfort. Therefore, when considering an incredibly sensitive decision such as the saddle, why make a conclusion without doing the testing? Selle already invested the money so it would have been helpful to test and rule it out.
- The differences between male and female average and maximum pressure was minimal at the 60 and 45 degree angle but at the 30 degree angle it was significant, which they concluded was due to the anatomical differences between male and female. Considering that Selle’s line of the Scientia is based on the upright rider vs. the road, gravel, cross, mountain, tri…etc. rider, they clearly avoided the area where there is significant sensitivity and variance among males and females. We are not inside the board room of intricate decisions of the Selle Royal juggernaut, but if they found significantly reduced pressure and gender differences at a higher spine angle, it makes sense that they would potentially avoid saddle selection that would disprove the sit bone width method.