2026 Surly Preamble Flat Bar vs 2026 3T Primo
The S is the 3T Primo size closest to your XS Surly Preamble Flat Bar. We match frame stack and reach. This is a geometry comparison, not a fit recommendation; stem, spacers, handlebars and saddle setup also affect your riding position.
What changes on the 3T Primo
Compared with the Surly Preamble Flat Bar in XS, the 3T Primo in S places the top of the head tube at about the same height and 14 mm further forward, relative to the bottom bracket.
- Frame stack
- ±0 mm
- About the same height
- Frame reach
- +14 mm
- Longer frame reach
- Wheelbase
- n/a
- One of the bikes has no number for this
- Head angle
- −0.5°
- Slacker: calmer steering
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
Only the Surly Preamble Flat Bar is drawn. The 3T Primo numbers we have for size S are missing the chainstay length and wheelbase.
Geometry side by side
| Measurement | Surly Preamble Flat Bar XS | 3T Primo S | Difference |
|---|---|---|---|
| Reach | 352 | 366 | +14 mm |
| Stack | 517 | 517 | ±0 mm |
| Head tube angle | 70 | 69.5 | −0.5° |
| Seat tube angle | 74 | 72.5 | −1.5° |
| Effective top tube | 500 | 529 | +29 mm |
| Chainstay length | 420 | not listed | |
| Wheelbase | 987 | not listed | |
| BB drop | 54 | 70 | +16 mm |
| Standover | 722 | not listed | |
| Seat tube length | 410 | 463 | +53 mm |
| Fork length | 380 | not listed | |
| Head tube length | 120 | 101 | −19 mm |
Differences are the 3T Primo minus the Surly Preamble Flat Bar. Full charts: 2026 Surly Preamble Flat Bar, 2026 3T Primo.
Where each sits in its class
Surly Preamble Flat Bar3T Primo
Each bike is ranked against the other gravel bikes on Quiver, on frame geometry alone. Not your hand position or ride feel.
What each ships with
The stock build of each bike's first listed trim. Parts that match are dimmed.
| Part | Surly Preamble Flat BarFlat Bar | 3T PrimoGRX 1X12 |
|---|---|---|
| Frame | Surly Preamble | 3T Primo2 |
| Shifter | microSHIFT Acolyte Xpress | Shimano GRX RX610 |
| Derailleur | microSHIFT RD-M5185M | Shimano GRX RX822 SGS |
| Chain | KMC Z8.3 | not listed |
| Tire | Kenda Kwik Tendril | Pirelli Cinturato Adventure |
| Brake | Avid BB5 | Shimano GRX RX400 |
| Saddle | Selle Italia X | fizik Vento Argo X5 |
| Fork | not listed | 3T Fango Primo2 |
| Cassette | not listed | Shimano Deore M6100 |
| Crankset | not listed | Shimano GRX RX610 |
| Wheelset | not listed | Fulcrum Rapid Red 900 |
| Rotor | not listed | Shimano SM-RT64 |
| Handlebar | not listed | 3T Superergo PRO |
| Stem | not listed | 3T Apto |
| Seatpost | not listed | 3T Primo |
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