2024 Trek FX Gen 3 vs 2026 Surly Preamble Flat Bar
The M is the Surly Preamble Flat Bar size closest to your M Trek FX Gen 3. 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 Gen 3 in M, the Surly Preamble Flat Bar in M places the top of the head tube 10 mm higher and 6 mm further back, relative to the bottom bracket. Its wheelbase is 30 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +10 mm
- Higher front end
- Frame reach
- −6 mm
- Shorter frame reach
- Wheelbase
- −30 mm
- Shorter: quicker to change direction
- Head angle
- +0.5°
- Steeper: sharper steering
- Chainstays
- −15 mm
- Shorter: livelier
The two frames
We can't draw these frames yet. The Trek FX Gen 3 numbers we have for size M are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek FX Gen 3 M | Surly Preamble Flat Bar M | Difference |
|---|---|---|---|
| Reach | 397 | 391 | −6 mm |
| Stack | 557 | 567 | +10 mm |
| Head tube angle | 71.5° | 72 | +0.5° |
| Effective top tube | 557 | 570 | +13 mm |
| Chainstay length | 450 | 435 | −15 mm |
| Wheelbase | 1060 | 1030 | −30 mm |
| BB drop | 65 | 66 | +1 mm |
| BB height | 296 | not listed | |
| Standover | 738 | 826 | +88 mm |
| Seat tube length | 445 | 565 | +120 mm |
| Head tube length | not listed | 130 | |
| Seat tube angle | not listed | 72.5 | |
| Fork length | not listed | 400 |
Differences are the Surly Preamble Flat Bar minus the Trek FX Gen 3. Full charts: 2024 Trek FX Gen 3, 2026 Surly Preamble Flat Bar.
Where each sits in its class
Trek FX Gen 3Surly 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 FX Gen 31 Gen 3 | Surly Preamble Flat BarFlat Bar |
|---|---|---|
| Frame | Trek Alpha Gold | Surly Preamble |
| Fork | Trek FX | not listed |
| Shifter | Shimano Altus EF500 | microSHIFT Acolyte Xpress |
| Derailleur | Shimano Tourney TY510, Shimano Acera M310 | microSHIFT RD-M5185M |
| Cassette | SunRace MFM300 | not listed |
| Chain | KMC Z7 | KMC Z8.3 |
| Bottom bracket | VP BC73 | not listed |
| Tire | Bontrager H2 | Kenda Kwik Tendril |
| Hub | Formula FM21, Formula FM31 | not listed |
| Rim | Bontrager Connection | not listed |
| Brake | not listed | Avid BB5 |
| Saddle | not listed | Selle Italia X |
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