Measuring your sit bones is easy and will help give you the perfect bike saddle fit. Here's how to do it...

Finding the ideal bike saddle is crucial for comfort and performance, particularly on longer rides where an ill-fitting saddle can cause significant discomfort. One of the most effective ways to ensure a proper fit is by measuring the width of your sit bones, the bony protrusions at the base of the pelvis that bear your weight when seated. Knowing this measurement helps cyclists select a saddle that provides adequate support, avoiding the common issues of saddles that are either too narrow or too wide. Sit bones, medically known as the Ischial Tuberosities, are the key points that a saddle must support to prevent pressure on soft tissues and muscles. A saddle that is too narrow leaves the sit bones unsupported, leading to discomfort, while a saddle that is too wide can cause the sit bones to rest on the edges of the saddle’s centre channel, where padding is minimal. Therefore, matching saddle width to sit bone width is essential for optimal comfort and injury prevention. Measuring sit bone width at home is straightforward and requires only a piece of corrugated cardboard. By sitting on the cardboard and marking the indentations left by the sit bones, riders can determine the distance between these points. This low-tech method closely replicates the results of professional pressure-mapping technology used by saddle manufacturers, making it a reliable and accessible option for most cyclists. It is important to ensure clothing does not interfere with the measurement and to use a firm chair for best results. Once the sit bone width is known, cyclists should select a saddle that is typically 15 to 20mm wider than this measurement to ensure proper support. Saddle positioning also plays a vital role in comfort; incorrect fore-aft placement or saddle tilt can cause the sit bones to rest in less supportive areas. Testing and adjusting saddle position after purchase can help fine-tune comfort, as demonstrated by the author’s personal experience comparing two different saddles with varying fits. Understanding sit bone width and its relationship to saddle fit offers cyclists a practical way to enhance their riding experience. This knowledge not only aids in choosing the right saddle but also informs adjustments to saddle setup, potentially reducing discomfort and improving performance. As saddle fit remains a highly individual aspect of cycling, this simple measurement technique provides a valuable starting point for riders seeking a more comfortable ride.