2017 Specialized Sirrus Sport vs 2019 Trek FX Sport
The L is the Trek FX Sport size closest to your M Specialized Sirrus 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 Trek FX Sport
Compared with the Specialized Sirrus Sport in M, the Trek FX Sport in L places the top of the head tube 11 mm higher and 7 mm further forward, relative to the bottom bracket.
- Frame stack
- +11 mm
- Higher front end
- Frame reach
- +7 mm
- Longer frame reach
- Wheelbase
- −1 mm
- About the same
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- −7 mm
- Shorter: livelier
The two frames
Only the Specialized Sirrus Sport is drawn. The Trek FX Sport numbers we have for size L are missing the seat angle.
Geometry side by side
| Measurement | Specialized Sirrus Sport M | Trek FX Sport L | Difference |
|---|---|---|---|
| Reach | 402mm | 409 | +7 mm |
| Stack | 600mm | 611 | +11 mm |
| Head tube angle | 71.5° | 71.5° | ±0.0° |
| Seat tube angle | 73.5° | not listed | |
| Effective top tube | 580mm | 590 | +10 mm |
| Chainstay length | 445mm | 438 | −7 mm |
| Wheelbase | 1073mm | 1072 | −1 mm |
| BB drop | 70mm | 65 | −5 mm |
| BB height | 281mm | 285 | +4 mm |
| Standover | 786mm | 781 | −5 mm |
| Seat tube length | 485mm | 508 | +23 mm |
| Fork length | 410mm | not listed | |
| Head tube length | 165mm | 185 | +20 mm |
Differences are the Trek FX Sport minus the Specialized Sirrus Sport. Full charts: 2017 Specialized Sirrus Sport, 2019 Trek FX Sport.
Where each sits in its class
Specialized Sirrus SportTrek 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 SportSport | Trek FX Sport4 |
|---|---|---|
| Derailleur | microSHIFT R9, Shimano Alivio | Shimano Tiagra, Shimano RD-4700 Tiagra |
| Chain | KMC X9 | KMC X10 |
| Crankset | FSA Vero | Shimano R460 |
| Bottom bracket | Specialized BB-7420STw/Bolts | not listed |
| Tire | Specialized Nimbus Reflect | Bontrager AW1 Hard-Case Lite |
| Brake | Shimano Acera M315 | Shimano MT201 |
| Saddle | Specialized Canopy Sport | 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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