2026 Surly Preamble Flat Bar vs 2025 Trek Crockett Disc Frameset
The 50 is the Trek Crockett Disc Frameset size closest to your S 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 Crockett Disc Frameset
Compared with the Surly Preamble Flat Bar in S, the Trek Crockett Disc Frameset in 50 places the top of the head tube at about the same height and 6 mm further back, relative to the bottom bracket. Its wheelbase is 12 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −1 mm
- About the same height
- Frame reach
- −6 mm
- Shorter frame reach
- Wheelbase
- −12 mm
- Shorter: quicker to change direction
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- +5 mm
- Longer: more planted
The two frames
Only the Surly Preamble Flat Bar is drawn. The Trek Crockett Disc Frameset numbers we have for size 50 are missing the seat angle.
Geometry side by side
| Measurement | Surly Preamble Flat Bar S | Trek Crockett Disc Frameset 50 | Difference |
|---|---|---|---|
| Reach | 381 | 375 | −6 mm |
| Stack | 535 | 534 | −1 mm |
| Head tube angle | 71 | 71.0° | ±0.0° |
| Seat tube angle | 73 | not listed | |
| Effective top tube | 545 | 518 | −27 mm |
| Chainstay length | 420 | 425 | +5 mm |
| Wheelbase | 1013 | 1001 | −12 mm |
| BB drop | 54 | 70 | +16 mm |
| Standover | 776 | 747 | −29 mm |
| Seat tube length | 505 | 476 | −29 mm |
| Fork length | 380 | not listed | |
| Head tube length | 135 | 110 | −25 mm |
Differences are the Trek Crockett Disc Frameset minus the Surly Preamble Flat Bar. Full charts: 2026 Surly Preamble Flat Bar, 2025 Trek Crockett Disc Frameset.
Where each sits in its class
Surly Preamble Flat BarTrek Crockett Disc Frameset
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 Crockett Disc FramesetCrockett Disc Frameset |
|---|---|---|
| Frame | Surly Preamble | Trek Alpha |
| 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 |
| Fork | not listed | Trek Cross |
Know what is on every bike.
Add your bike to Quiver. Keep its parts, setup, and service history together, then share your build.
Explore the app
