The key points in 30 seconds
- Your sit bones are the two bones you should be sitting on. Slight tenderness when getting back into riding is common; sharp or lasting pain is not.
- The most common causes: a saddle of the wrong width, padding that's too soft or compressed, a poorly adjusted saddle, or too long a ride all at once.
- The right method: measure your sit bone width, choose the saddle width that matches your position, then adjust the saddle one setting at a time.
You get off the bike and it's the two bones at the bottom of your backside that are complaining? You're not alone. Sit bone pain is one of the most common complaints among recreational cyclists, especially after a break, a new bike or a longer ride than usual. The good news: in most cases, it comes down to a few adjustments and your choice of saddle. Here's how to find what's wrong.
Sit bones: the bones built to carry your weight
Your sit bones (ischial tuberosities) are two bony bumps at the base of your pelvis. Sit on a hard chair and slide your hands under your buttocks: those are the two points you feel. On a bike, they should carry most of your weight. The more sensitive area between them should get only light pressure.
That's the whole point of a good saddle: firmly supporting the sit bones without sinking, while leaving the central area alone.
Normal or not? Telling the difference
At the start of the season or after several weeks off the bike, sit bone tenderness during the first rides is common: your body is getting used to the pressure again. It usually eases ride after ride if you build up the duration gradually.
On the other hand, pain that sets in within the first few tens of minutes, gets worse from one ride to the next or forces you to keep standing on the pedals is not a stage you have to go through. It almost always points to an equipment or setup problem.
The 5 most common causes
- A saddle that's too narrow. Your sit bones overhang the seat and press on the edges. Your weight then shifts toward the center and the sensitive area.
- A saddle that's too wide for your position. In a leaned-forward position, a very wide seat rubs your inner thighs and makes you shift around constantly.
- Padding that's too soft or compressed. Your bones sink down to the saddle's rigid base, and the foam pushes up between them. The comfort of the first fifteen minutes comes at a price later.
- A poorly adjusted saddle. Too high, it makes your pelvis rock with every pedal stroke. Nose tilted too far up or down, it shifts pressure forward or makes you slide.
- Too much, too soon, or without protection. A ride much longer than usual, or pants with a thick seam under your backside, is enough to trigger the pain.
Measure your sit bone width in 5 minutes
This is the most useful measurement before choosing a saddle. You'll need a piece of corrugated cardboard, a ruler and a pencil.
- Place the cardboard on a hard chair or step.
- Sit on it, feet on the floor, then lean your upper body slightly forward, as on your bike.
- Stay there for about thirty seconds, then stand up: two impressions appear.
- Circle them in pencil and measure the distance between their centers, in millimeters.
This measurement isn't yet the saddle width you need: the more upright you sit, the wider the area your pelvis rests on. Saddle maker SQlab therefore recommends adding 10 to 40 mm depending on your position (source in French). As a guide:
| Your position | Examples | Add to your measurement |
|---|---|---|
| Very leaned forward | Performance road | + 10 to 20 mm |
| Intermediate | Leisure road, gravel, MTB | + 20 to 30 mm |
| Upright | City, hybrid, e-bike | + 30 to 40 mm |
Example: a 120 mm sit bone width and a touring position on a road bike gives a saddle about 140 to 150 mm wide.
Adjust your saddle to relieve your sit bones
Before changing saddles, check these three settings. Change only one at a time and keep it for two or three rides before judging.
- Height. With your heel on the pedal at the bottom of the stroke, your leg should be almost straight. When pedaling normally, your knee stays slightly bent. If your hips rock from side to side, the saddle is too high.
- Tilt. Place a spirit level (or your phone's level app) on the saddle: start with a flat seat, then adjust by 1 to 2 degrees at most if needed.
- Setback. A saddle too far forward makes you slide toward the nose, one too far back makes you pull on your arms. Measure from the bottom bracket axle and note the value before changing anything.
A commonly used guide for height: at the bottom of the pedal stroke, your knee stays bent at about 25 to 35°. If you're still unsure, a bike shop can check your whole position.
Which saddle should you choose when your sit bones hurt?
Keep three criteria in mind, in this order:
- The right width, calculated with the method above. This is the criterion that matters most.
- Firm support under the sit bones, that doesn't crush down to the base after an hour.
- A relieved central area (channel or cutout), so pressure stays on the bones and not between them.
That's exactly what saddles with 3D-printed padding aim to do. Their structure is made of hundreds of cells that each deform independently: they mold to your sit bones without collapsing, where traditional foam compresses as a single block.
Our pick
R-3D Saddle – 150 mm
3D-printed padding, central channel open along the full length, short nose, 250 × 150 mm and 270 g. Fits standard seatposts (7 mm round rails). A 150 mm width matches, according to the calculation above, a sit bone width of about 110 to 130 mm in a road or gravel position.
60-day trial · Free shipping from $59 (US) / A$85 (AU)
Discover the R-3D saddleDo you ride sitting very upright, in town or on an e-bike, with wide sit bones? A wider, suspended seat like the Elite Comfort+ Saddle better suits that position.
Finally, don't forget what you're wearing: padding between you and the saddle makes a big difference on long rides. We cover this in Should you wear underwear under cycling shorts?
When to seek medical advice
See a doctor or physical therapist if the pain persists for several days off the bike, if it comes with swelling or numbness that doesn't go away after stopping, or if it radiates down your thigh. A saddle or an adjustment doesn't replace that assessment.
Frequently asked questions
How long does it take to get used to a new saddle?
Usually two to three rides, sticking to your usual durations. If the pain increases instead of decreasing, check the width or the setup again.
Is a wider saddle always more comfortable?
No. It must match your sit bone width and your position. Too wide in a leaned-forward position, it rubs your inner thighs.
Does gel fix sit bone pain?
Not necessarily. Gel or foam that's too soft lets your bones sink and shifts pressure toward the center. Support matters more than softness.
Should I stand on the pedals for relief?
Standing up from time to time helps restore circulation. But if you have to do it every ten minutes, it's the saddle or its setup that needs looking at.