Sit Bone Width: The Only Measurement That Matters
Your sit bones (ischial tuberosities) are the two bony points that bear most of your weight on a saddle. The distance between them determines your saddle width. Too narrow and you sit on soft tissue. Too wide and the edges chafe your thighs.
Most bike shops offer free sit bone measurement using a pressure mat. You can also measure at home by sitting on corrugated cardboard and measuring the distance between the two deepest impressions. Add 20–25mm to that number for your target saddle width.
- Narrow (<130mm sit bones): 130–143mm saddle width
- Medium (130–150mm): 143–155mm saddle width
- Wide (>150mm): 155–168mm saddle width
Flat vs. Curved vs. Channel
Flat saddles (PRO Stealth, Specialized Power) suit aggressive, rotated positions where you sit on the nose and pubic rami. Curved saddles (Fizik Antares) suit moderate positions and allow more movement fore/aft. Channel/cutout saddles relieve pressure on the perineum — almost every modern saddle now includes some form of pressure relief channel.
Quick Comparison
| Saddle | Shape | Widths | Weight | Rails | Price |
|---|---|---|---|---|---|
| Fizik Antares Versus Evo | Curved, channel | 140/150mm | 205g | Carbon | $280 / €260 |
| Specialized Power Pro Mirror | Flat, cutout | 143/155/168mm | 195g | Carbon | $350 / €330 |
| PRO Stealth Team | Flat, narrow | 142/152mm | 185g | Carbon | $230 / €210 |
| Selle Italia SLR Boost TM | Flat, Superflow | 130/145mm | 175g | Titanium | $200 / €185 |
| SQLab 612 Ergowave R | Stepped, channel | 130/140/150/160mm | 225g | CrMo / Carbon | $160 / €150 |
| Prologo Scratch M5 | Flat, narrow | 140mm | 195g | Titanium | $140 / €130 |
Editor’s Picks
Best Overall
Fizik Antares Versus Evo
$280 · 205g
Best for Wide Sit Bones
SQLab 612 Ergowave R
$160 · 4 widths
Best Premium
Specialized Power Pro Mirror
$350 · 3D-printed
Individual Reviews
Fizik Antares Versus Evo
The Antares is the most versatile saddle here. The moderate curve suits riders who move around on the saddle — sitting upright on long climbs and rolling forward on the flats. The central pressure relief channel runs the full length of the saddle, reducing perineal pressure in every position.
The 3D-printed Adaptive version adds zonal cushioning that conforms to your anatomy over the first few rides. At $280 for the standard version (or $400 for the 3D Adaptive), it’s priced in the mid-premium range. Two widths cover most riders. Carbon rails keep the weight at 205g.
Verdict: Best saddle for riders who don’t know what they want. The curved shape and full-length channel work for the widest range of positions and anatomies.
Specialized Power Pro Mirror
Specialized pioneered the short-nose flat saddle with the Power. The Pro Mirror version uses 3D-printed padding (Mirror technology) that provides zonal compliance — softer where you sit, firmer at the edges for support. The large central cutout eliminates soft tissue pressure entirely.
Three widths (143/155/168mm) cover almost all riders. Specialized dealers offer the Retul digital fitting system that recommends your width from a pressure scan. At $350 it’s expensive, but riders who fit the flat-saddle profile report zero numbness even on 5-hour rides.
Verdict: Best flat saddle. The 3D-printed Mirror padding is a genuine innovation. Worth the price if you ride in an aggressive position.
PRO Stealth Team
The Stealth is a race saddle — designed for aggressive positions with significant pelvic rotation. The flat profile, narrow nose, and minimal padding suit time trialists and crit racers. At 185g with carbon rails, it’s the lightest option here.
The trade-off: comfort on rides over 3 hours requires a well-fitted position. This is not a saddle for casual riders or those still dialing in their bike fit. But for racers who know their position, the Stealth is precise and stable.
Verdict: Best race saddle. Light, fast, stable. Not for everyone — you need to be fit to it, not the other way around.
Selle Italia SLR Boost TM
The SLR is the lightest saddle here at 175g with titanium rails. The Superflow cutout is aggressive — larger than the Fizik channel — and very effective at pressure relief. The Boost version is slightly shorter and wider than the classic SLR, suiting modern compact frames.
Two width options (130/145mm) limit it to narrow and medium sit bones. Wide riders should look elsewhere. The padding is firm by modern standards — you sit on the shell, not in the padding. This suits riders who prioritize power transfer and feedback.
Verdict: Lightest, most direct feel. Best for weight-conscious riders with narrow-to-medium sit bones who want an aggressive race saddle.
SQLab 612 Ergowave R
SQLab’s approach is different: the stepped rear provides a defined sitting area that keeps your sit bones in position, and four width options (130/140/150/160mm) cover more riders than any other brand. The Ergowave shape follows the natural curvature of the pelvis.
Riders switching from Specialized Power saddles to the 612 frequently report eliminated saddle sores within weeks. The central relief channel is deep and effective. At $160 for the CrMo version, it’s the best value performance saddle on this list.
Verdict: Best saddle for comfort-first riders. Four widths means you actually find the right fit. The stepped design prevents sliding forward on climbs.
Prologo Scratch M5
The budget race saddle. At $140, the Scratch M5 provides a flat, narrow profile with titanium rails and firm padding. The CPC (Connecting Points to the Cyclist) grip treatment on the cover reduces movement in the saddle during hard efforts.
Only one width (140mm) limits the audience to narrow sit bones. Comfort is adequate for 2–3 hour rides but drops off for longer events. Best as a race-day or trainer saddle where comfort over 4 hours isn’t the priority.
Verdict: Cheapest race saddle that doesn’t compromise on weight. Good option for indoor training or short, intense races.
Stop Chasing Saddles
If you’ve tried three or more saddles without finding comfort, the problem is almost certainly your bike fit, not the saddle. Saddle height, setback, and tilt by 1–2 degrees change pressure distribution more than any saddle swap. Get a professional bike fit before buying another saddle.
What We’d Buy
Best overall: Fizik Antares Versus Evo. Works for the widest range of positions and anatomies. The full-length channel is effective in every riding posture.
Best for wide sit bones: SQLab 612 Ergowave R. Four width options and the stepped design solve the fit problem that most saddles ignore. Best comfort-to-cost ratio.
Best premium: Specialized Power Pro Mirror. 3D-printed zonal cushioning is a real advancement. If your dealer has Retul fitting, the system nails your width on the first try.
Comfortable on the saddle? Now make those hours count.
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