2021 Specialized Sirrus 2.0 vs 2021 Trek FX Sport
The S is the Trek FX Sport size closest to your XXS Specialized Sirrus 2.0. 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 FX Sport
Compared with the Specialized Sirrus 2.0 in XXS, the Trek FX Sport in S places the top of the head tube 22 mm higher and 22 mm further forward, relative to the bottom bracket. Its wheelbase is 20 mm longer, which can contribute to stability at speed.
- Frame stack
- +22 mm
- Higher front end
- Frame reach
- +22 mm
- Longer frame reach
- Wheelbase
- +20 mm
- Longer: steadier at speed
- Head angle
- +1.0°
- Steeper: sharper steering
- Chainstays
- −2 mm
- About the same
The two frames
Only the Specialized Sirrus 2.0 is drawn. The Trek FX Sport numbers we have for size S are missing the seat angle.
Geometry side by side
| Measurement | Specialized Sirrus 2.0 XXS | Trek FX Sport S | Difference |
|---|---|---|---|
| Reach | 373mm | 395 | +22 mm |
| Stack | 536mm | 558 | +22 mm |
| Head tube angle | 69.5° | 70.5° | +1.0° |
| Seat tube angle | 73.5° | not listed | |
| Chainstay length | 440mm | 438 | −2 mm |
| Wheelbase | 1036mm | 1056 | +20 mm |
| Standover | 692mm | 712 | +20 mm |
| Seat tube length | 360mm | 406 | +46 mm |
| Fork length | 395mm | not listed | |
| Head tube length | 121mm | 135 | +14 mm |
| Effective top tube | not listed | 550 | |
| BB drop | not listed | 65 | |
| BB height | not listed | 285 |
Differences are the Trek FX Sport minus the Specialized Sirrus 2.0. Full charts: 2021 Specialized Sirrus 2.0, 2021 Trek FX Sport.
Where each sits in its class
Specialized Sirrus 2.0Trek FX Sport
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 | Specialized Sirrus 2.02.0 | Trek FX Sport5 |
|---|---|---|
| Shifter | Shimano Acera | Shimano Tiagra 4700 |
| Derailleur | Shimano Tourney FD-TY710, Shimano Acera | Shimano Tiagra 4700 |
| Cassette | Shimano Altus | Shimano Tiagra HG-500 |
| Chain | KMC X8 | KMC X10 |
| Crankset | Shimano Tourney | Shimano Tiagra 4700 |
| Tire | Specialized RoadSport Reflect | Bontrager R1 Hard-Case Lite |
| Brake | Promax F1 | Shimano MT201 |
| Saddle | Specialized Bridge Sport | Bontrager Montrose |
| Frame | not listed | Trek OCLV |
| Fork | not listed | Trek FX |
| Bottom bracket | not listed | Shimano BB71 |
| Rim | not listed | Bontrager Affinity |
| Handlebar | not listed | Bontrager Satellite Plus IsoZone |
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