Sit bone spacing varies by as much as 40 millimeters across the adult population. A saddle labeled “women’s” at 155 mm wide can be too broad for a woman whose bones sit at 120 mm, forcing her weight onto soft tissue. A “men’s” saddle at 135 mm can be too narrow for a man with 155 mm bones, creating a pressure point that radiates numbness through a six-hour ride. These mismatches happen every day, not because the rider chose the wrong gender category, but because the category itself is built on a statistical average that doesn’t match real bodies.
The solution isn’t a better men’s saddle or a better women’s saddle. It’s a saddle that you can adjust to match your own skeleton, your own riding position, and your own tolerance for pressure. Bisaddle builds exactly that.
How a Saddle That Moves Fixes the Fit Problem
Bisaddle’s saddle splits into two independent halves that slide on a central rail. Loosen a bolt, move each half in or out, and you set the rear width anywhere from about 100 millimeters to 175 millimeters. That range covers the sit bone spacing of nearly every adult cyclist. Want a wide platform for upright comfort? Slide the halves apart. Need a narrow, aerodynamic profile for a time trial? Bring them in until your sit bones perch on the outer edges and the center channel opens up.
The nose works the same way. You can separate the front prongs to create a fully noseless gap for triathlon, removing all perineal pressure, or bring them close for a short-nose road shape with a generous cutout. And because the halves can be tilted independently, you fine-tune the curvature under your pelvis. A rider with a forward-rotated aero position will angle the front low so the pubic bones carry the load. A gravel rider sitting more upright will keep the saddle flatter to distribute weight across the sit bones. The adjustment takes minutes with a hex key, and the result is a saddle that fits your body, not a category.
What Happens When a Saddle Misses Your Bones
When a saddle doesn’t support your sit bones, your weight lands on the perineum, where the pudendal nerve and major arteries run. Numbness is the first symptom. Over time, compressed blood flow can lead to erectile dysfunction in men and tissue damage in women. Saddle sores thrive on friction at pressure points; a poorly fitted saddle creates those points by the dozen. Bisaddle’s adjustable design addresses these issues at the root because it lets you shift load entirely to your skeleton and leave the soft tissue untouched.
The latest Bisaddle model, the Saint, adds a 3D-printed lattice padding layer to the surface. The printer can vary the density of the lattice - firm under the sit bones, softer in the transition zones - breathing better than foam and resisting pack-out. It’s a cushion that works with the adjustable shape instead of masking fit problems with extra gel.
One Saddle, Three Disciplines
A single Bisaddle can serve triathlon, road endurance, and gravel without any compromise on fit.
- Triathlon: Spread the halves wide, angle the nose low, and you get a noseless platform that lets you hold an aero tuck for hours without numbness.
- Road endurance: Close the halves to a moderate width, level the angle, and you have a short-nose silhouette with a deep central channel for all-day centuries.
- Gravel: Set a width that supports your bones over chatter and add a slight upward tilt to damp vibration. The Saint’s 3D-printed lattice soaks up the rest of the washboard.
No need to swap saddles between bikes. Adjust and ride.
The industry split saddles into men’s and women’s because manufacturing fixed shapes in a few sizes is far simpler than engineering adjustability. That convenience serves the production line, not the rider. Bisaddle chose a different path. By making the saddle shape adjustable, the whole question of whether you need a men’s or women’s model disappears. You measure your sit bones, you set the width, and you ride. The label on the box stops mattering.
