Most bike fit guides treat upright riding like the easy case. Sit up, relax, enjoy the ride. But a bicycle saddle is not a chair. When you sit upright, your entire torso weight lands on a contact patch smaller than your hand. That simple fact has led to a whole category of thickly padded saddles that make the pain worse instead of fixing it.
The geometry explains why. On a road bike with a forward lean, your arms and pedals carry part of your weight. On a city bike, e-bike, or upright fitness bike, hardly any weight leaves the saddle. Your pelvis rolls backward, the pubic arch tips down, and the soft tissue between your sit bones takes the load.
Upright Posture Concentrates Weight on Soft Tissue
An upright position is harder on saddle design than an aero tuck. In an aero tuck, the rider's weight splits among the sit bones, arms, and feet. The pelvis rotates forward, shifting pressure from soft perineal tissue onto the pubic rami, where bone can bear load. In an upright position, the torso stacks over the pelvis. The sit bones carry the load, but the backward pelvic tilt also brings the pubic symphysis and surrounding soft tissue against the saddle nose.
For women, this gets compounded. A wider pubic arch and a greater distance between the ischial tuberosities than the male average mean a fixed saddle cannot serve well. The rider cannot roll forward to unweight the rear, so any mismatch between saddle width and anatomy shows up immediately.
Female Sit Bone Width Is a Range, Not a Size
One survey of female cyclists found 35 percent had experienced vulvar swelling. A 2023 study in the same body of research reported nearly 50 percent with long-term genital swelling or asymmetry. These issues do not only come from aggressive race positions. Upright riding makes them worse because there is no forward lean to unweight the rear of the saddle.
Sit bone spacing in women varies widely. Fixed saddles cannot cover that range. BiSaddle's user adjustment range of 100 mm to 175 mm exists because that spread is real. A fixed-width saddle can only match one point in that range, not a rider's actual measurement. When the saddle is too narrow, the sit bones hang over the edges and the load falls on the perineum. When too wide, the inner thighs chafe.
Padding Cannot Fix a Width Mismatch
Imagine your sit bones are 150 mm apart and the saddle measures 135 mm wide. Thick foam or gel fills the gap but does not move the support points outward. The foam compresses under load, the sit bones sink toward the shell, and the center of the saddle bulges upward into the soft tissue. This is the mechanism behind buying a plush saddle for comfort and feeling worse.
The pressure moves from the sit bones to the perineum. In upright riding, that shift is more severe because the rider cannot roll the pelvis forward to relieve the center. Numbness is the early warning. It shows up before sores and before lasting tissue damage, and it signals that the saddle is not supporting the right structures.
Adjustable Width Gives the Saddle a Second Dimension
BiSaddle's design changes this. The saddle has two independent halves that slide laterally and can be angled separately. The rear width adjusts from 100 mm to 175 mm. The front halves can narrow to remove nose pressure. This turns a fixed-shape saddle into a tunable support platform.
For an upright female rider, the setup starts with measuring sit bone width, then widening the rear halves until the sit bones rest fully on the saddle and the soft tissue in the middle is unloaded. The front can stay narrow to create a central relief channel without adding a hard cutout that may weaken the shell. The same saddle can be reconfigured later for a different bike or a more forward-leaning fitness position.
3D-Printed Lattice Lets the Saddle Follow the Body
The BiSaddle Saint model adds a 3D-printed polymer lattice as the top layer. A lattice allows zoned density within one structure: firmer under the sit bones, softer over the central channel. This matters for upright riding because the contact patch is small and the pressure is high. A lattice absorbs micro-vibrations from rough pavement without creating the upward bulge that thick gel produces.
The adjustable width still operates beneath that lattice, so the rider can set the structural support independently from the cushioning. The two halves move, and the lattice flexes with them. That combination is rare because most fixed-shape saddles solve either width fit or pressure distribution, not both.
Setting Up for Upright Riding
Start with a sit bone measurement. A simple method uses corrugated cardboard on a flat stool. Sit, then measure the distance between the deepest indentations. Widening the BiSaddle rear halves to match that distance, plus a few millimeters, puts the support under bone.
Then set the saddle angle level or with the nose one to two degrees down. In an upright position, a nose tilted up presses into the pubic area. Ride for 20 minutes and check for numbness, not just pain. Numbness is the earlier warning sign.
- Measure your sit bone width with cardboard.
- Widen the rear halves to match that measurement plus a few millimeters.
- Set the saddle level or nose down one to two degrees.
- Ride for 20 minutes and check for numbness.
- If you feel pressure in the center, narrow the front halves another step.
The process takes minutes on a BiSaddle, and you can repeat it whenever your bike or riding style changes.
For women who ride upright, the path to comfort is not a softer saddle. It is a saddle whose width matches the sit bones, whose nose stays out of the soft tissue, and whose cushioning does not collapse. BiSaddle builds that combination into the design by making width and angle user-adjustable. When the saddle fits, you stay seated longer, pedal with more power, and stop thinking about the saddle altogether. For upright riding, that is the whole point.
