2015 Specialized Sirrus Expert Carbon Disc vs 2017 Trek FX Sport Women's
The 56 is the Trek FX Sport Women's size closest to your L Specialized Sirrus Expert 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 Expert Carbon Disc in L, the Trek FX Sport Women's in 56 places the top of the head tube 25 mm lower and 33 mm further back, relative to the bottom bracket. Its wheelbase is 62 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −25 mm
- Lower front end
- Frame reach
- −33 mm
- Shorter frame reach
- Wheelbase
- −62 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 Expert 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 Expert Carbon Disc L | Trek FX Sport Women's 56 | Difference |
|---|---|---|---|
| Reach | 410mm | 377 | −33 mm |
| Stack | 616mm | 591 | −25 mm |
| Head tube angle | 72° | 71.9° | −0.1° |
| Seat tube angle | 73° | not listed | |
| Effective top tube | 600mm | 554 | −46 mm |
| Chainstay length | 435mm | 420 | −15 mm |
| Wheelbase | 1070mm | 1008 | −62 mm |
| BB drop | 70mm | 78 | +8 mm |
| Standover | 822mm | 776 | −46 mm |
| Seat tube length | 530mm | 525 | −5 mm |
| Head tube length | 190mm | 175 | −15 mm |
| BB height | not listed | not listed |
Differences are the Trek FX Sport Women's minus the Specialized Sirrus Expert Carbon Disc. Full charts: 2015 Specialized Sirrus Expert Carbon Disc, 2017 Trek FX Sport Women's.
Where each sits in its class
Specialized Sirrus Expert 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 Expert Carbon DiscExpert Carbon Disc | Trek FX Sport Women's4 Women's |
|---|---|---|
| Frame | Specialized Sirrus FACT | Trek WSD FX Alpha Gold |
| Derailleur | Shimano 105 | Shimano Tiagra, Shimano Sora R350 |
| Cassette | Shimano 105 | Shimano Tiagra |
| Chain | KMC X-11 | KMC X10 |
| Crankset | FSA Gossamer | Shimano R460 |
| Wheelset | Specialized AXIS 2.0 | Formula TK31 |
| Tire | Specialized Espoir Sport Reflect | Bontrager AW1 Hard-Case Lite |
| Brake | Magura MTS | not listed |
| Seatpost | Specialized Pro Pave | Bontrager SSR |
| Saddle | Specialized Targa Comp | Bontrager H1 WSD |
| Fork | not listed | Bontrager Nebula |
| Shifter | not listed | Shimano Tiagra |
| 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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