You got fitted. The shop put you on a pad, measured the distance between your sit bones, and handed you a saddle in one fixed width. It felt fine on the hoods for about an hour. Then you dropped into the drops and the nose started pressing into soft tissue. Your pelvis rotated forward and moved the load. The saddle that fit your upright measurement no longer fit your riding position. Bisaddle built a saddle with two independent halves that slide and pivot, so rear width can move from 100 mm to 175 mm while the saddle stays clamped to the seatpost. The width can change because the fit requirement changed.
Fixed Widths Fight Male Pelvic Rotation
Most shops measure a male rider's sit bone width while he sits upright. That number applies to one posture only. On a road bike in the drops, the pelvis tips forward, the sit bones narrow, and the perineum takes more pressure. On a gravel climb, the pelvis rocks back and needs a wider platform. A fixed shell cannot cover both. It either compresses the perineum in the low position or spreads the sit bones too far when upright. Bisaddle's sliding halves let you change the rear width on the bike, so the same shell adapts to the position you are actually riding.
What a Urology Study Found About Penile Oxygen
One urology study measured penile oxygen pressure while cyclists sat on different saddles. A narrow, heavily padded saddle reduced penile oxygen by 82 percent. A wider noseless design limited the drop to about 20 percent. Those numbers are not subtle. Repeated oxygen loss can lead to nerve injury or erectile dysfunction in men who log long miles. The internal pudendal artery and pudendal nerve run through the perineum. When a saddle shell presses on that area for hours, the pressure compresses them. Bisaddle's split shell creates a central channel between the two halves. Moving the halves apart widens that channel and removes material from the exact area where the artery runs. You get the pressure-free center while keeping a supported rear.
Two Hot Spots, Two Independent Adjustments
Pressure mapping shows two consistent trouble zones on a male cyclist: the sit bones and the perineum. The sit bones should carry the body's weight. The perineum should carry none. A fixed saddle forces these two zones into one rigid shape. Support the sit bones and the perineum gets compressed. Widen the shell to reduce perineal pressure and the inner thighs chafe. Bisaddle separates the two. The rear width carries the sit bones. The central gap opens independently to take pressure off the perineum. You tune each zone separately, which is the part no fixed shell can replicate.
Bisaddle Men's Models Compared
Each model adjusts rear width from 100 mm to 175 mm. Prices across the line run from $249 to $349.
- Saint - Short nose, adjustable front gap, 3D-printed polymer foam lattice, carbon rail option around 320 g. Best for road endurance, gravel, and all-day riding.
- Hurricane - Short nose, adjustable front gap, high-density foam, chromoly rails around 360 g. Best for durable touring, commuting, and value fit.
- SRT - Noseless full central gap, high-density foam, chromoly or carbon rails in the 320 to 360 g range. Best for triathlon, time trial, and indoor training.
The Saint carries the 3D-printed lattice. It uses different densities in different zones, firmer under the sit bones and softer in the center. That variable density also damps high-frequency vibration from rough gravel better than a single foam sheet. The Hurricane pairs the same adjustable frame with high-density foam. It costs less and weighs a bit more. The SRT removes the nose entirely. For men who spend hours on aerobars, that front gap means zero contact with the pubic bone and the base of the penis.
Setting the Saddle for Three Disciplines
Road endurance
Measure your sit bone width in the riding position you use most. Set the Bisaddle rear width to that measurement, not wider. If the number is 135 mm, open the rear halves to 135 mm. Lower each half's inner edge by 1 to 2 degrees so the channel stays open without reducing sit bone support. Ride a 30-minute trainer session. Adjust in 2 mm steps if a hot spot appears.
Triathlon
Install the SRT or narrow the front gap on the Saint or Hurricane to about 10 mm. Rotate the saddle nose slightly downward, no more than 3 degrees from level. That lets your pubic rami carry weight instead of the soft tissue behind them. Set the rear width to your sit bone measurement plus 5 mm. The extra width keeps you stable when you are locked into the aero position for two hours or more.
Gravel
Choose the Saint for the 3D-printed lattice. It damps high-frequency vibration better than a single-density foam. Set the rear width 3 to 5 mm wider than your road setting because your pelvis sits more upright on loose climbs. Keep the central gap open. Washboard roads drive a closed shell straight into the perineum, and that damage builds over a five-hour gravel race.
Padding Is Not the Answer
A thick gel saddle feels soft in the showroom. Put a rider's full weight on it and the padding collapses. The sit bones sink. The center of the shell pushes upward. The channel you thought you had disappears. That is why the narrow, heavily padded saddle in the urology study performed worst. Bisaddle uses a firm base under its foam or lattice, so the width adjustment does the work. The central gap stays open because the structure does not collapse under body weight.
Adjusting a Bisaddle in 30 Minutes
- Measure your sit bone width with pressure paper or a piece of aluminum foil on a towel.
- Loosen the adjustment bolts under the shell.
- Slide each half to the measured width.
- Set both halves level.
- Tilt the inner edges down 1 to 2 degrees if you feel numbness.
- Test for 30 minutes on a trainer.
- Move the halves in 2 mm increments and repeat until pressure feels even under both sit bones.
The first proper setup takes less than an afternoon. After that, most changes are a one-minute tweak before a long ride.
What the SRT Does Differently
The SRT removes the saddle nose entirely rather than shortening it. In an aero tuck, a traditional saddle nose becomes a pressure point against the pubic bone and the base of the penis. Removing that piece eliminates the contact. Many male triathletes who try a noseless design find that the numbness they accepted as normal disappears on the first ride. The SRT keeps the same adjustable rear width. You can support your sit bones while the perineum stays completely open. A fixed noseless shell cannot do that because it must pick one rear width for every rider. The SRT lets you set the width you need.
Limits Worth Knowing Before You Buy
- The adjustable hardware adds weight. Carbon rail versions sit around 320 grams. Chromoly versions sit around 360 grams.
- The saddle costs between $249 and $349, which puts it in the premium category.
- The mechanism requires periodic bolt torque checks, especially after rough gravel rides.
- The saddle will not set itself. You must measure, adjust, and recheck, especially after changing riding positions.
Bisaddle's men's line starts from the same adjustable frame. The Saint, Hurricane, and SRT differ in padding, rail, and nose length. What they share matters more. The rear width moves to match your sit bones in the position you are actually riding, and the central gap opens to protect the perineum. For men whose saddle discomfort has become a normal part of riding, that adjustability changes the ride more than any extra padding ever could.
