2018 Trek FX Sport vs 2020 Specialized Sirrus 1.0
The XXS is the Specialized Sirrus 1.0 size closest to your XS 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 XS, the Specialized Sirrus 1.0 in XXS places the top of the head tube 3 mm higher and 15 mm further back, relative to the bottom bracket. Its wheelbase is 9 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +3 mm
- Higher front end
- Frame reach
- −15 mm
- Shorter frame reach
- Wheelbase
- −9 mm
- Shorter: quicker to change direction
- 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 XS are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek FX Sport XS | Specialized Sirrus 1.0 XXS | Difference |
|---|---|---|---|
| Reach | 388 | 373mm | −15 mm |
| Stack | 533 | 536mm | +3 mm |
| Head tube angle | 70.0° | 69.5° | −0.5° |
| Effective top tube | 531 | not listed | |
| Chainstay length | 438 | 440mm | +2 mm |
| Wheelbase | 1045 | 1036mm | −9 mm |
| BB drop | 65 | not listed | |
| BB height | 285 | not listed | |
| Standover | 684 | 692mm | +8 mm |
| Seat tube length | 356 | 360mm | +4 mm |
| Head tube length | 110 | 121mm | +11 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: 2018 Trek FX Sport, 2020 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 Sport4 | Specialized Sirrus 1.01.0 |
|---|---|---|
| Frame | Trek Alpha | not listed |
| Fork | Trek FX | not listed |
| Shifter | Shimano Tiagra | Shimano EF500 |
| Derailleur | Shimano Tiagra, Shimano RD-4700 Tiagra | Shimano Tourney, Shimano Altus |
| Cassette | Shimano Tiagra | Shimano HG200 |
| Chain | KMC X10 | KMC X8 |
| Crankset | Shimano R460 | Shimano Tourney |
| Tire | Bontrager AW1 Hard-Case Lite | Specialized Roadsport |
| Brake | Shimano MT201 | not listed |
| Handlebar | Bontrager Satellite Plus IsoZone | not listed |
| Seatpost | Bontrager SSR | not listed |
| Saddle | Bontrager H1 | Specialized Bridge Sport |
Know what is on every bike.
Add your bike to Quiver. Keep its parts, setup, and service history together, then share your build.
Explore the app
