Three fixed saddles this season. Two hundred miles of discomfort, and each one came with a label promising female-specific relief. That label told you nothing about the width of your pelvis.
Comfort comes from matching the shell to three numbers: your sit-bone width, your pelvic angle, and your riding position. A gender category cannot carry those numbers. Bisaddle does something a fixed shell cannot do. It changes shape.
Gender Categories Cannot Show the Spread
Bike shops have sorted saddles into men's and women's versions for decades. The sorting depends on an average, and the average is real. Women tend to have wider sit bones and benefit from a shorter nose. But the spread inside that category is wider than the difference between the categories.
A rider with 120 mm sit-bone spacing and a rider with 150 mm spacing both see a women's label. They need different rear widths. A fixed shell cannot serve both.
A 2023 survey of female cyclists put numbers on the cost. 35 percent reported vulvar swelling. Nearly 50 percent reported long-term genital swelling or asymmetry. Those injuries trace to saddles carrying weight on soft tissue instead of the ischial tuberosities and pubic rami.
Width Is a Measurement
Start with a gel imprint or pressure pad at your local shop. The number you get is the distance between your ischial tuberosities, in millimeters. That number is your saddle width target.
Bisaddle lets you hit that target directly. The rear section is two halves that slide apart or together. The documented range runs from 100 mm to 175 mm, which covers sit-bone spacings far beyond small, medium, and large. Each half moves independently, so you can add a few millimeters on one side if your pelvis is asymmetric.
When the two halves separate, the center opens into a channel. That channel removes material from the perineal zone, and because the width is set by you rather than by a mold, the cutout matches your anatomy instead of someone else's.
Nose Pressure Cuts Blood Flow
Roll your pelvis forward in an aero position and a traditional saddle nose presses into soft tissue. That pressure can compress the pudendal artery and nerve. Numbness is the first sign. Reduced blood flow is the mechanism.
Bisaddle's front section narrows until the nose effectively disappears. The left and right prongs separate, leaving a gap where a solid nose would be. Bisaddle also makes a fully noseless model called the SRT for riders who want zero forward pressure.
Each half tilts on its own. In an aero position, you can drop the front angle without changing the rear support. Your sit bones stay loaded. The soft tissue clears.
The Saint's 3D-Printed Lattice
The Bisaddle Saint pairs the adjustable shell with a 3D-printed polymer lattice. The lattice has open cells that compress under sit bones and stay firmer at the edges. It spreads vertical pressure over a bigger area than solid foam.
Solid foam forces a trade. Dense foam supports but creates hot spots. Soft foam lets the sit bones sink until the shell pushes back. A lattice varies density zone by zone without changing the shell shape.
Female anatomy benefits in the front. The pubic rami have little muscle coverage, so lower lattice density there reduces soft tissue pressure while the rear stays supportive.
A Six-Step Fit
- Measure your sit-bone width in millimeters.
- Loosen the rear width bolts and slide the halves to match that number.
- Narrow the front until it clears the labia and perineal tissue in your riding position.
- Set each half's angle so the rear supports bone and the front drops slightly.
- Ride for 20 minutes, then adjust 2 mm at a time.
- Recheck after two weeks. Your position shifts as you adapt.
The rails work with standard seatposts. Move the same Bisaddle from a road bike to a gravel bike and tweak width instead of buying another shell.
Where Fit Goes Next
Bisaddle's manual adjusters already pair with a shop pressure mat. A fitter can slide the halves while watching the left-right balance on screen. A future model with embedded sensors would close that loop in real time.
Fit becomes a process rather than a purchase. If you still feel numbness after trying several padded or cutout shells, measure your sit bones. Loosen the bolts. Adjust until the load sits on bone, not soft tissue.
