2017 Specialized Sirrus Sport Carbon vs 2019 Trek FX Sport
The Trek FX Sport size closest to your M is the M. Compare the M instead
What changes on the Trek FX Sport
Compared with the Specialized Sirrus Sport Carbon in M, the Trek FX Sport in XS places the top of the head tube 58 mm lower and 15 mm further back, relative to the bottom bracket. Its wheelbase is 15 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −58 mm
- Lower front end
- Frame reach
- −15 mm
- Shorter frame reach
- Wheelbase
- −15 mm
- Shorter: quicker to change direction
- Head angle
- −1.5°
- Slacker: calmer steering
- Chainstays
- +3 mm
- Longer: more planted
The two frames
Only the Specialized Sirrus Sport Carbon is drawn. The Trek FX Sport numbers we have for size XS are missing the seat angle.
Geometry side by side
| Measurement | Specialized Sirrus Sport Carbon M | Trek FX Sport XS | Difference |
|---|---|---|---|
| Reach | 403mm | 388 | −15 mm |
| Stack | 591mm | 533 | −58 mm |
| Head tube angle | 71.5° | 70.0° | −1.5° |
| Seat tube angle | 73.5° | not listed | |
| Effective top tube | 578mm | 531 | −47 mm |
| Chainstay length | 435mm | 438 | +3 mm |
| Wheelbase | 1060mm | 1045 | −15 mm |
| BB drop | 70mm | 65 | −5 mm |
| BB height | 275mm | 285 | +10 mm |
| Standover | 784.6mm | 684 | −101 mm |
| Seat tube length | 485mm | 356 | −129 mm |
| Fork length | 398mm | not listed | |
| Head tube length | 165mm | 110 | −55 mm |
Differences are the Trek FX Sport minus the Specialized Sirrus Sport Carbon. Full charts: 2017 Specialized Sirrus Sport Carbon, 2019 Trek FX Sport.
Where each sits in its class
Specialized Sirrus Sport CarbonTrek 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 Sport CarbonSport Carbon | Trek FX Sport4 |
|---|---|---|
| Derailleur | microSHIFT R9, Shimano Alivio | Shimano Tiagra, Shimano RD-4700 Tiagra |
| Chain | SRAM PC-971 | KMC X10 |
| Crankset | FSA Vero | Shimano R460 |
| Bottom bracket | Specialized BB-7420STw/Bolts | not listed |
| Tire | Specialized Espoir Sport Reflect | Bontrager AW1 Hard-Case Lite |
| Brake | Shimano Acera M315 | Shimano MT201 |
| Stem | Specialized Flowset | not listed |
| Saddle | Specialized Canopy Comp | Bontrager H1 |
| Frame | not listed | Trek Alpha |
| Fork | not listed | Trek FX |
| Shifter | not listed | Shimano Tiagra |
| Cassette | not listed | Shimano Tiagra |
| Handlebar | not listed | Bontrager Satellite Plus IsoZone |
| Seatpost | not listed | Bontrager SSR |
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