2021 Trek FX Sport vs 2023 Specialized Sirrus 1.0
The S is the Specialized Sirrus 1.0 size closest to your S Trek FX Sport. 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 in S, the Specialized Sirrus 1.0 in S places the top of the head tube 4 mm higher and about as far forward, relative to the bottom bracket. Its wheelbase is 5 mm longer, which can contribute to stability at speed.
- Frame stack
- +4 mm
- Higher front end
- Frame reach
- −2 mm
- About the same reach
- Wheelbase
- +5 mm
- Longer: steadier at speed
- 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 numbers we have for size S are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek FX Sport S | Specialized Sirrus 1.0 S | Difference |
|---|---|---|---|
| Reach | 395 | 393mm | −2 mm |
| Stack | 558 | 562mm | +4 mm |
| Head tube angle | 70.5° | 70° | −0.5° |
| Effective top tube | 550 | not listed | |
| Chainstay length | 438 | 440mm | +2 mm |
| Wheelbase | 1056 | 1061mm | +5 mm |
| BB drop | 65 | not listed | |
| BB height | 285 | not listed | |
| Standover | 712 | 745mm | +33 mm |
| Seat tube length | 406 | 440mm | +34 mm |
| Head tube length | 135 | 147mm | +12 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. Full charts: 2021 Trek FX Sport, 2023 Specialized Sirrus 1.0.
Where each sits in its class
Trek FX SportSpecialized 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 Sport5 | Specialized Sirrus 1.01.0 |
|---|---|---|
| Frame | Trek OCLV | not listed |
| Fork | Trek FX | not listed |
| Shifter | Shimano Tiagra 4700 | Shimano EF500 |
| Derailleur | Shimano Tiagra 4700 | Shimano Tourney FD-TY710-2, Shimano Altus |
| Cassette | Shimano Tiagra HG-500 | Shimano HG200 |
| Chain | KMC X10 | KMC X8 |
| Crankset | Shimano Tiagra 4700 | not listed |
| Bottom bracket | Shimano BB71 | not listed |
| Tire | Bontrager R1 Hard-Case Lite | Specialized Roadsport |
| Rim | Bontrager Affinity | not listed |
| Brake | Shimano MT201 | not listed |
| Handlebar | Bontrager Satellite Plus IsoZone | not listed |
| Saddle | Bontrager Montrose | Specialized Bridge Sport |
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