When elite cyclist Sarah learned she was pregnant with her second child, she faced a dilemma familiar to many athletic mothers. Her first pregnancy had forced her off the bike entirely by the second trimester-not because her doctor advised against riding, but because the saddle that had served her through thousands of miles became unbearable. The pressure, the numbness, the inability to find a comfortable position-it all added up to frustration and eventually, surrender.
This story repeats itself countless times across the cycling world. Pregnant athletes are told to buy wider saddles, then told those saddles are too wide postpartum. They're advised to stand more frequently, to shift position constantly, to simply "listen to their bodies." But rarely is the fundamental problem addressed: the saddle itself is static, while the pregnant body is anything but.
What Actually Happens to Your Pelvis During Pregnancy
To understand why pregnancy creates such profound saddle challenges, we need to look at what's happening beneath the skin. The hormonal changes of pregnancy-specifically the release of relaxin-begin loosening the pelvic joints as early as the first trimester. This isn't a minor adjustment. The pubic symphysis, that cartilaginous joint at the front of the pelvis, can widen by 10 to 15 millimeters by the third trimester. Your sit bones, the ischial tuberosities that should bear your weight on the saddle, are literally moving apart.
At the same time, your center of gravity shifts forward as the uterus expands. This changes how you sit on the saddle, rotating your pelvis and redistributing weight toward the nose. A saddle that fit perfectly at 12 weeks may feel completely wrong at 28 weeks-not because you've lost fitness or become "uncomfortable on the bike," but because your skeletal structure has physically changed.
The perineal region also becomes more vascular and sensitive during pregnancy. The same pressure that might cause mild numbness in a non-pregnant rider can become genuinely problematic when blood flow to the pelvic region is already compromised by the growing uterus. Research on cycling and perineal pressure has shown that any saddle causing significant compression of the pudendal artery can reduce oxygen perfusion by over 80%. For a pregnant athlete, this isn't just about comfort-it's about maintaining healthy circulation for both mother and child.
Why the "Wider Saddle" Advice Falls Short
The conventional wisdom for pregnant cyclists has been simple: buy a wider saddle with more padding. This sounds reasonable. If your sit bones are spreading, give them more room. If your pelvic area is more sensitive, add cushioning.
But the biomechanics don't work that way. A wider saddle may support your sit bones during early pregnancy, but as your pelvis continues to widen, that same saddle begins pressing against the pubic rami and soft tissue. You're not being supported anymore-you're being compressed. The extra padding, rather than providing comfort, creates a hammock effect where your sit bones sink into the foam and the saddle's nose tilts upward into your perineum. This is precisely the pressure pattern that causes numbness, circulatory issues, and the very discomfort you were trying to avoid.
The problem is compounded by the fact that every pregnancy is different. Some women experience significant pelvic widening; others, minimal. Some carry forward; others carry low. A fixed saddle, no matter how thoughtfully designed, can only accommodate one anatomical configuration at a time. And pregnancy is a moving target.
The Adjustable Alternative: A Saddle That Changes With You
This is where the concept of an adjustable saddle becomes not merely convenient but medically relevant. A Bisaddle is designed with independent left and right halves-two separate platforms that can slide closer together or farther apart, with independent angle adjustment for each side. This offers something no fixed-geometry saddle can: the ability to track your changing anatomy in real time.
During early pregnancy, you set the Bisaddle to your pre-pregnancy sit bone width. As your pelvis widens, you gradually increase the gap between the halves, ensuring that your weight continues to be supported by your ischial tuberosities rather than transferred to soft tissue. The adjustment is incremental-a few millimeters every few weeks-so you can fine-tune the fit as your body changes.
The adjustable design also creates a customizable central relief channel. By separating the saddle halves, you create a gap that relieves perineal pressure. This is not a fixed cutout that may or may not align with your anatomy. It's a dynamic space that you can widen or narrow as needed. For the pregnant cyclist, this means maintaining a comfortable, healthy riding position throughout all three trimesters without purchasing multiple saddles.
The independent angle adjustment is equally valuable. As your center of gravity shifts forward, you may need to tilt the saddle slightly to maintain proper pelvic rotation and avoid excessive pressure on the pubic bone. A fixed saddle offers only a single tilt adjustment at the seatpost clamp, which cannot be altered as your body changes week by week. A Bisaddle allows for fine-tuning that accommodates your shifting biomechanics.
A Practical Guide for the Pregnant Cyclist
If you're considering a Bisaddle for pregnancy, the approach is straightforward. Follow these steps:
- Start with your baseline. Begin with the saddle set to your pre-pregnancy sit bone width, ideally measured through a professional bike fitting.
- Adjust incrementally. As pregnancy progresses, increase the width by roughly two to three millimeters every few weeks. Monitor for comfort-the goal is to maintain weight on your sit bones rather than allowing it to migrate to your perineum.
- Experiment with angle. Many riders find that a slight forward tilt helps maintain proper pelvic rotation as the belly grows. Small adjustments-a degree or two-can make a significant difference.
- Listen to your body. Pay attention to any numbness, tingling, or sharp pressure, and adjust accordingly. If something feels wrong, change the configuration.
It's also worth noting that your riding position may change. As your center of gravity shifts, you may find yourself sitting more upright, which changes the angle of your pelvis relative to the saddle. The adjustable design of a Bisaddle allows you to compensate for this by tilting the saddle halves independently, maintaining the support you need.
Beyond Pregnancy: The Long-Term Investment
One of the most compelling arguments for the Bisaddle is that it serves you across your entire athletic lifecycle, not just during pregnancy. The same saddle you use during pregnancy can be reconfigured for postpartum recovery, then for your normal training, and later for any future pregnancies. This is not a "maternity saddle" that gets relegated to a closet after use-it's a long-term investment in your riding comfort and health.
Postpartum recovery presents its own set of challenges. Your pelvic floor may be weakened and sensitive. Your sit bone spacing may have changed permanently. A saddle that was comfortable during the third trimester may now feel too wide, causing instability and chafing. With a Bisaddle, you can narrow the saddle back to your postpartum sit bone width and adjust the angle to accommodate any lingering lower back discomfort or changes in hip flexibility.
The Bigger Picture: Moving Beyond Static Design
The Bisaddle represents a broader shift in how we think about cycling equipment. For too long, the industry has treated the human body as a fixed, unchanging entity. You get measured once, you buy a saddle, and that's supposed to last you for years. But the body is dynamic. It changes with training, with age, with injury, with pregnancy, with recovery. Why shouldn't your equipment change with it?
For the pregnant cyclist who wants to maintain her training throughout pregnancy and return to riding postpartum, a Bisaddle is not a luxury. It's a practical tool for managing the most profound biomechanical changes her body will ever experience. It acknowledges that the female athlete is not a static entity but a dynamic, evolving system. And it offers a solution that evolves with her.
The next time you hear a pregnant cyclist say she had to give up riding because of saddle discomfort, consider this: the problem wasn't her body. It was the saddle. And there's a better way.
