2015 Specialized Sirrus Pro Carbon Disc vs 2017 Trek FX Sport Women's
The 56 is the Trek FX Sport Women's size closest to your XL Specialized Sirrus Pro Carbon Disc. 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 Women's
Compared with the Specialized Sirrus Pro Carbon Disc in XL, the Trek FX Sport Women's in 56 places the top of the head tube 59 mm lower and 43 mm further back, relative to the bottom bracket. Its wheelbase is 83 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −59 mm
- Lower front end
- Frame reach
- −43 mm
- Shorter frame reach
- Wheelbase
- −83 mm
- Shorter: quicker to change direction
- Head angle
- −0.1°
- About the same head angle
- Chainstays
- −15 mm
- Shorter: livelier
The two frames
Only the Specialized Sirrus Pro Carbon Disc is drawn. The Trek FX Sport Women's numbers we have for size 56 are missing the seat angle.
Geometry side by side
| Measurement | Specialized Sirrus Pro Carbon Disc XL | Trek FX Sport Women's 56 | Difference |
|---|---|---|---|
| Reach | 420mm | 377 | −43 mm |
| Stack | 650mm | 591 | −59 mm |
| Head tube angle | 72° | 71.9° | −0.1° |
| Seat tube angle | 73° | not listed | |
| Effective top tube | 620mm | 554 | −66 mm |
| Chainstay length | 435mm | 420 | −15 mm |
| Wheelbase | 1091mm | 1008 | −83 mm |
| BB drop | 70mm | 78 | +8 mm |
| Standover | 861mm | 776 | −85 mm |
| Seat tube length | 570mm | 525 | −45 mm |
| Head tube length | 225mm | 175 | −50 mm |
| BB height | not listed | not listed |
Differences are the Trek FX Sport Women's minus the Specialized Sirrus Pro Carbon Disc. Full charts: 2015 Specialized Sirrus Pro Carbon Disc, 2017 Trek FX Sport Women's.
Where each sits in its class
Specialized Sirrus Pro Carbon DiscTrek FX Sport Women's
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 Pro Carbon DiscPro Carbon Disc | Trek FX Sport Women's4 Women's |
|---|---|---|
| Frame | Specialized Sirrus FACT | Trek WSD FX Alpha Gold |
| Shifter | SRAM SL X1 | Shimano Tiagra |
| Derailleur | SRAM X1 | Shimano Tiagra, Shimano Sora R350 |
| Cassette | SRAM XG-1180 | Shimano Tiagra |
| Chain | SRAM X1 | KMC X10 |
| Crankset | SRAM Force CX1 | Shimano R460 |
| Wheelset | Specialized AXIS 4.0 | Formula TK31 |
| Brake | Magura MTS | not listed |
| Seatpost | Specialized Pro Pave | Bontrager SSR |
| Saddle | Specialized Phenom Expert | Bontrager H1 WSD |
| Fork | not listed | Bontrager Nebula |
| Tire | not listed | Bontrager AW1 Hard-Case Lite |
| Hub | not listed | Formula TK-31, Formula TK-32 |
| Handlebar | not listed | Bontrager Satellite Plus IsoZone |
| Headset | not listed | VP Slimstak |
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