2026 Surly Preamble Flat Bar vs 2026 Trek Boone
The 49 is the Trek Boone 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 Trek Boone
Compared with the Surly Preamble Flat Bar in XS, the Trek Boone in 49 places the top of the head tube 17 mm higher and 23 mm further forward, relative to the bottom bracket. Its wheelbase is 14 mm longer, which can contribute to stability at speed.
- Frame stack
- +17 mm
- Higher front end
- Frame reach
- +23 mm
- Longer frame reach
- Wheelbase
- +14 mm
- Longer: steadier at speed
- Head angle
- +1.0°
- Steeper: sharper steering
- Chainstays
- +5 mm
- Longer: more planted
The two frames
Only the Surly Preamble Flat Bar is drawn. The Trek Boone numbers we have for size 49 are missing the seat angle.
Geometry side by side
| Measurement | Surly Preamble Flat Bar XS | Trek Boone 49 | Difference |
|---|---|---|---|
| Reach | 352 | 375 | +23 mm |
| Stack | 517 | 534 | +17 mm |
| Head tube angle | 70 | 71.0° | +1.0° |
| Seat tube angle | 74 | not listed | |
| Effective top tube | 500 | 518 | +18 mm |
| Chainstay length | 420 | 425 | +5 mm |
| Wheelbase | 987 | 1001 | +14 mm |
| BB drop | 54 | 70 | +16 mm |
| Standover | 722 | 747 | +25 mm |
| Seat tube length | 410 | 476 | +66 mm |
| Fork length | 380 | not listed | |
| Head tube length | 120 | 110 | −10 mm |
Differences are the Trek Boone minus the Surly Preamble Flat Bar. Full charts: 2026 Surly Preamble Flat Bar, 2026 Trek Boone.
Where each sits in its class
Surly Preamble Flat BarTrek Boone
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 | Trek Boone |
|---|---|---|
| Frame | Surly Preamble | not listed |
| Shifter | microSHIFT Acolyte Xpress | not listed |
| Derailleur | microSHIFT RD-M5185M | not listed |
| Chain | KMC Z8.3 | not listed |
| Tire | Kenda Kwik Tendril | not listed |
| Brake | Avid BB5 | not listed |
| Saddle | Selle Italia X | not listed |
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