2015 Specialized Fatboy Pro vs 2015 Trek Farley
The XL is the Trek Farley size closest to your XL Specialized Fatboy Pro. 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 Farley
Compared with the Specialized Fatboy Pro in XL, the Trek Farley in XL places the top of the head tube 16 mm lower and 3 mm further back, relative to the bottom bracket. Its wheelbase is 13 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −16 mm
- Lower front end
- Frame reach
- −3 mm
- Shorter frame reach
- Wheelbase
- −13 mm
- Shorter: quicker to change direction
- Head angle
- −0.5°
- Slacker: calmer steering
- Chainstays
- −15 mm
- Shorter: livelier
The two frames
Only the Specialized Fatboy Pro is drawn. The Trek Farley numbers we have for size XL are missing the seat angle.
Geometry side by side
| Measurement | Specialized Fatboy Pro XL | Trek Farley XL | Difference |
|---|---|---|---|
| Reach | 458mm | 455 | −3 mm |
| Stack | 629mm | 613 | −16 mm |
| Head tube angle | 70.5° | 70.0° | −0.5° |
| Seat tube angle | 73° | not listed | |
| Effective top tube | 650mm | 643 | −7 mm |
| Chainstay length | 455mm | 440 | −15 mm |
| Wheelbase | 1154mm | 1141 | −13 mm |
| BB drop | 60mm | 55 | −5 mm |
| BB height | 315mm | 313 | −2 mm |
| Standover | 849mm | 832 | −17 mm |
| Seat tube length | 533mm | 521 | −12 mm |
| Head tube length | 150mm | 120 | −30 mm |
Differences are the Trek Farley minus the Specialized Fatboy Pro. Full charts: 2015 Specialized Fatboy Pro, 2015 Trek Farley.
Where each sits in its class
Specialized Fatboy ProTrek Farley
Each bike is ranked against the other fat 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 Fatboy ProPro | Trek Farley6 |
|---|---|---|
| Fork | RockShox Bluto RL | not listed |
| Shifter | SRAM X01 | Shimano Deore |
| Derailleur | SRAM X01 | SRAM X-5, Shimano Deore XT |
| Cassette | SRAM X1 | Shimano HG50 |
| Chain | KMC X11L | KMC X10 |
| Crankset | Race Face Next SL | not listed |
| Pedals | Specialized Bennies | not listed |
| Tire | Specialized Ground Control Fat | Bontrager Hodag |
| Hub | Specialized Hi Lo | not listed |
| Rim | Specialized Fatboy SL | Sun Ringlé Mulefüt |
| Brake | Shimano XT | Avid DB 1 |
| Grips | Specialized Contour | not listed |
| Dropper post | Specialized Command Post BlackLite | not listed |
| Frame | not listed | Trek Alpha Platinum |
| Headset | not listed | FSA IS2 |
| Saddle | not listed | Bontrager Evoke 2 |
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