2025 Trek FX Sport SL vs 2023 Specialized Sirrus 1.0
The XXS is the Specialized Sirrus 1.0 size closest to your XS Trek FX Sport SL. 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 Specialized Sirrus 1.0
Compared with the Trek FX Sport SL in XS, the Specialized Sirrus 1.0 in XXS places the top of the head tube 7 mm lower and 10 mm further back, relative to the bottom bracket. Its wheelbase is 11 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −7 mm
- Lower front end
- Frame reach
- −10 mm
- Shorter frame reach
- Wheelbase
- −11 mm
- Shorter: quicker to change direction
- Head angle
- −0.5°
- Slacker: calmer steering
- Chainstays
- −2 mm
- About the same
The two frames
We can't draw these frames yet. The Trek FX Sport SL numbers we have for size XS are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek FX Sport SL XS | Specialized Sirrus 1.0 XXS | Difference |
|---|---|---|---|
| Reach | 383 | 373mm | −10 mm |
| Stack | 543 | 536mm | −7 mm |
| Head tube angle | 70.0° | 69.5° | −0.5° |
| Effective top tube | 528 | not listed | |
| Chainstay length | 442 | 440mm | −2 mm |
| Wheelbase | 1047 | 1036mm | −11 mm |
| BB drop | 65 | not listed | |
| BB height | 285 | not listed | |
| Standover | 708 | 692mm | −16 mm |
| Seat tube length | 356 | 360mm | +4 mm |
| Head tube length | 115 | 121mm | +6 mm |
| Seat tube angle | not listed | 73.5° | |
| Fork length | not listed | 395mm |
Differences are the Specialized Sirrus 1.0 minus the Trek FX Sport SL. Full charts: 2025 Trek FX Sport SL, 2023 Specialized Sirrus 1.0.
Where each sits in its class
Trek FX Sport SLSpecialized Sirrus 1.0
Each bike is ranked against the other commuter 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 Sport SL | Specialized Sirrus 1.01.0 |
|---|---|---|
| Shifter | not listed | Shimano EF500 |
| Derailleur | not listed | Shimano Tourney FD-TY710-2, Shimano Altus |
| Cassette | not listed | Shimano HG200 |
| Chain | not listed | KMC X8 |
| Tire | not listed | Specialized Roadsport |
| Saddle | not listed | Specialized Bridge Sport |
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