Sit bone spacing varies from rider to rider. A fixed saddle gives you one rear width, no matter how soft the padding or how short the nose. A 30-minute ride in street clothes can leave you numb, sore, or chafed if that width doesn't match your body. Bisaddle approaches this differently: you set the rear width yourself.
Sit bone spacing is the measurement that matters
Women's saddle design spent years chasing an average: wider rear, shorter nose, extra padding. But an average pelvis doesn't ride your bike. Sit bone width doesn't split cleanly by gender. The distance between your sit bones is the number that matters, not the category label.
A 2023 study found nearly half of female cyclists reported long-term genital swelling or asymmetry after time on fixed saddles. That's a pressure problem. Bisaddle's rear width adjusts from about 100mm to 175mm, so you match the saddle to your own sit bones instead of an average.
Commuting punishes a fixed-width saddle more than a weekend ride
On a commute, you sit more upright than in a sport position, which drives your sit bones into the saddle. You also ride in street clothes without a chamois to spread the load. If the rear is too narrow, your sit bones slide off the edges and soft tissue takes the pressure. If the rear is too wide, the shell edge rubs your inner thighs at every stoplight. A saddle that doesn't adjust can't fix either problem.
Bisaddle's two halves slide on the rear rail. You narrow the saddle for winter tights, widen it for summer shorts, and make both changes in minutes with a single tool.
Three adjustments that change the contact patch
Bisaddle's patented shape is adjustable: two halves slide and pivot. The system gives you three independent changes: rear width, half angle, and front gap. Rear width positions your sit bones. Half angle tilts each side to match your pelvic rotation. Front gap controls the space between the nose halves, exactly where soft tissue pressure builds on a non-adjustable saddle.
Each half adjusts separately, so the saddle doesn't need to be symmetric. That helps if you pedal with one hip rotated or carry a bag over one shoulder. The Saint model adds a 3D-printed polymer surface on top of the adjustable base. It cushions under the sit bones and gives way in the middle. The SRT variant removes the front section entirely, an option for riders who want zero nose contact and relief from labial pressure on stop-and-go rides.
What pressure looks like on a commute
On a non-adjustable saddle, your weight follows the molded shape. On a Bisaddle, you move the platform until your skeleton carries the load. Common commute problems map to specific adjustments:
- Numbness after 20 minutes in street clothes: Open the front gap or switch to the SRT noseless front.
- Sit bone soreness by Friday: Slide the rear width from 100mm to 175mm until your sit bones land on the flat rear shelf.
- Inner thigh chafing at intersections: Narrow the rear or tilt each half slightly.
- Pressure shifts between tights and shorts: Re-set the rear width in minutes when the season changes.
A five-step setup for commuters
- Measure sit bone spacing. Sit on corrugated cardboard on a flat chair for 10 seconds. The two deepest dents mark your sit bones.
- Set the Bisaddle rear width so each sit bone rests on the flat rear shelf, not on an edge or in the gap.
- Open the front gap until nothing touches the nose when you sit in your normal commuting posture.
- Adjust each half's angle to match your pelvic tilt. Upright riders usually need a flatter rear; forward-leaning riders may tilt down.
- Ride in the clothes you actually commute in. Recheck after a week.
One saddle across bikes, seasons, and jobs
Many commuters keep a primary bike, a backup bike, and maybe an e-bike. Bisaddle uses standard rails, so you can move the same saddle from bike to bike. Set the width once, write down the measurements, and copy them to the next bike.
This turns the saddle into a per-rider purchase instead of a per-bike purchase. When your commute changes with a new job or a different season, you adjust the saddle rather than buying another one. The right saddle for your commute matches your sit bones, and those measurements change less than your bikes do. Bisaddle lets you set that measurement directly.
