2026 Surly Preamble Flat Bar vs 2026 Trek Boone
The 54 is the Trek Boone size closest to your M 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 M, the Trek Boone in 54 places the top of the head tube 5 mm lower and 8 mm further back, relative to the bottom bracket. Its wheelbase is 20 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −5 mm
- Lower front end
- Frame reach
- −8 mm
- Shorter frame reach
- Wheelbase
- −20 mm
- Shorter: quicker to change direction
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- −10 mm
- Shorter: livelier
The two frames
Only the Surly Preamble Flat Bar is drawn. The Trek Boone numbers we have for size 54 are missing the seat angle.
Geometry side by side
| Measurement | Surly Preamble Flat Bar M | Trek Boone 54 | Difference |
|---|---|---|---|
| Reach | 391 | 383 | −8 mm |
| Stack | 567 | 562 | −5 mm |
| Head tube angle | 72 | 72.0° | ±0.0° |
| Seat tube angle | 72.5 | not listed | |
| Effective top tube | 570 | 544 | −26 mm |
| Chainstay length | 435 | 425 | −10 mm |
| Wheelbase | 1030 | 1010 | −20 mm |
| BB drop | 66 | 68 | +2 mm |
| Standover | 826 | 779 | −47 mm |
| Seat tube length | 565 | 513 | −52 mm |
| Fork length | 400 | not listed | |
| Head tube length | 130 | 138 | +8 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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