2027 Trek FX vs 2026 Surly Preamble Flat Bar
The M is the Surly Preamble Flat Bar size closest to your S Trek FX. 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 Surly Preamble Flat Bar
Compared with the Trek FX in S, the Surly Preamble Flat Bar in M places the top of the head tube at about the same height and 6 mm further forward, relative to the bottom bracket. Its wheelbase is 29 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −1 mm
- About the same height
- Frame reach
- +6 mm
- Longer frame reach
- Wheelbase
- −29 mm
- Shorter: quicker to change direction
- Head angle
- +1.5°
- Steeper: sharper steering
- Chainstays
- −12 mm
- Shorter: livelier
The two frames
We can't draw these frames yet. The Trek FX numbers we have for size S are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek FX S | Surly Preamble Flat Bar M | Difference |
|---|---|---|---|
| Reach | 385 | 391 | +6 mm |
| Stack | 568 | 567 | −1 mm |
| Head tube angle | 70.5° | 72 | +1.5° |
| Effective top tube | 543 | 570 | +27 mm |
| Chainstay length | 447 | 435 | −12 mm |
| Wheelbase | 1059 | 1030 | −29 mm |
| BB drop | 65 | 66 | +1 mm |
| BB height | 285 | not listed | |
| Standover | 715 | 826 | +111 mm |
| Seat tube length | 375 | 565 | +190 mm |
| Head tube length | 140 | 130 | −10 mm |
| Seat tube angle | not listed | 72.5 | |
| Fork length | not listed | 400 |
Differences are the Surly Preamble Flat Bar minus the Trek FX. Full charts: 2027 Trek FX, 2026 Surly Preamble Flat Bar.
Where each sits in its class
Trek FXSurly Preamble Flat Bar
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 | Trek FX2 | Surly Preamble Flat BarFlat Bar |
|---|---|---|
| Fork | Trek FX | not listed |
| Shifter | Shimano CUES U4000 | microSHIFT Acolyte Xpress |
| Derailleur | Shimano CUES U4000 | microSHIFT RD-M5185M |
| Cassette | Shimano LINKGLIDE LG300 | not listed |
| Tire | Bontrager H2 Comp | Kenda Kwik Tendril |
| Rotor | Tektro Wave | not listed |
| Frame | not listed | Surly Preamble |
| Chain | not listed | KMC Z8.3 |
| Brake | not listed | Avid BB5 |
| Saddle | not listed | Selle Italia X |
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