2027 Trek FX Sport SL vs 2026 Specialized Sirrus X 1.0
The XL is the Specialized Sirrus X 1.0 size closest to your XL 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 X 1.0
Compared with the Trek FX Sport SL in XL, the Specialized Sirrus X 1.0 in XL places the top of the head tube 15 mm lower and 4 mm further forward, relative to the bottom bracket. Its wheelbase is 14 mm longer, which can contribute to stability at speed.
- Frame stack
- −15 mm
- Lower front end
- Frame reach
- +4 mm
- Longer frame reach
- Wheelbase
- +14 mm
- Longer: steadier at speed
- Head angle
- −1.5°
- 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 XL are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek FX Sport SL XL | Specialized Sirrus X 1.0 XL | Difference |
|---|---|---|---|
| Reach | 410 | 414mm | +4 mm |
| Stack | 648 | 633mm | −15 mm |
| Head tube angle | 72.5° | 71° | −1.5° |
| Effective top tube | 613 | 602mm | −11 mm |
| Chainstay length | 442 | 440mm | −2 mm |
| Wheelbase | 1082 | 1096mm | +14 mm |
| BB drop | 65 | 70mm | +5 mm |
| BB height | 285 | 288mm | +3 mm |
| Standover | 848 | 837mm | −11 mm |
| Seat tube length | 559 | 530mm | −29 mm |
| Head tube length | 215 | 217mm | +2 mm |
| Seat tube angle | not listed | 73.5° | |
| Fork length | not listed | 395mm |
Differences are the Specialized Sirrus X 1.0 minus the Trek FX Sport SL. Full charts: 2027 Trek FX Sport SL, 2026 Specialized Sirrus X 1.0.
Where each sits in its class
Trek FX Sport SLSpecialized Sirrus X 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 SLSL 4 | Specialized Sirrus X 1.01.0 |
|---|---|---|
| Frame | Trek FX Sport | not listed |
| Fork | Carbon | not listed |
| Shifter | Shimano CUES U6000 | Shimano Altus SL-M315-7R |
| Derailleur | Shimano CUES U6000 GS | Shimano Acera |
| Cassette | Shimano CUES LG300 | microSHIFT CS-H074 |
| Chain | KMC Glide | KMC X8 |
| Crankset | Prowheel Alloy | Prowheel XXS |
| Chainring | Prowheel narrow-wide | not listed |
| Pedals | Bontrager City | not listed |
| Wheelset | Bontrager Paradigm | not listed |
| Tire | Bontrager GR1 Expert | Specialized Pathfinder Wirebead Fast Gravel |
| Hub | Formula CL-51, Formula CL-52 | not listed |
| Rim | Bontrager Paradigm | not listed |
| Brake | Shimano MT201 | Specialized Lee Chi |
| Rotor | Shimano SM-RT10 | not listed |
| Handlebar | Bontrager Satellite Plus IsoZone | not listed |
| Stem | Bontrager Elite | not listed |
| Grips | Bontrager Satellite IsoZone Plus | Specialized Neutralizer |
| Headset | Bontrager Expander Plug | not listed |
| Seatpost | Bontrager alloy | not listed |
| Saddle | Trek Verse | Specialized Bridge Sport |
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