How To Measure Sit Bones Saddle. You can try to mimic your position when you ride a bike but it’s not accurate enough. If my sit bones have a narrow width then i should look for a narrow saddle.
Sit on letterhead for 5 seconds. The saddle manufacturer says there are direct links between wrist and sit bone dimensions. If you are between two sizes, always round up.
A number of my clients have been to a retailer that had them sit on some contraption to measure their sit bone width and were then sold a saddle to match this only to still be unhappy with their saddle comfort.
Then you should ride a 155 if your sit bones measure out between 130mm and 160mm, and you ride a very aerodynamic, racing or triathlon position, you should ride a 143mm saddle. Put white letterhead (a4) format page on the paper towel. If a saddle is too narrow, your sit bones won’t be supporting your weight and you’ll feel like you are straddling a horizontal pipe because the sit bones will sitting on the slopes of the saddle not the flat area. Most shops will have a device to measure the distance between your sit bones without being intrusive: