2018 Specialized Fatboy vs 2020 Trek Farley 9.8
The XL is the Trek Farley 9.8 size closest to your XL Specialized Fatboy. 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 9.8
Compared with the Specialized Fatboy in XL, the Trek Farley 9.8 in XL places the top of the head tube 9 mm lower and 4 mm further back, relative to the bottom bracket. Its wheelbase is 12 mm longer, which can contribute to stability at speed.
- Frame stack
- −9 mm
- Lower front end
- Frame reach
- −4 mm
- Shorter frame reach
- Wheelbase
- +12 mm
- Longer: steadier at speed
- Head angle
- −1.5°
- Slacker: calmer steering
- Chainstays
- ±0 mm
- About the same
The two frames
Specialized Fatboy, XLTrek Farley 9.8, XLDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Fatboy XL | Trek Farley 9.8 XL | Difference |
|---|---|---|---|
| Reach | 458mm | 454 | −4 mm |
| Stack | 628mm | 619 | −9 mm |
| Head tube angle | 70.5° | 69.0° | −1.5° |
| Seat tube angle | 73° | 73.0° | ±0.0° |
| Effective top tube | 650mm | 644 | −6 mm |
| Chainstay length | 455mm | 455 | ±0 mm |
| Wheelbase | 1159mm | 1171 | +12 mm |
| BB drop | 60mm | 67 | +7 mm |
| BB height | 316mm | 321 | +5 mm |
| Standover | 840mm | 774 | −66 mm |
| Seat tube length | 533mm | 521 | −12 mm |
| Fork length | 467mm | not listed | |
| Head tube length | 150mm | 120 | −30 mm |
Differences are the Trek Farley 9.8 minus the Specialized Fatboy. Full charts: 2018 Specialized Fatboy, 2020 Trek Farley 9.8.
Where each sits in its class
Specialized FatboyTrek Farley 9.8
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 FatboyFatboy | Trek Farley 9.89.8 |
|---|---|---|
| Shifter | SRAM NX | SRAM GX Eagle |
| Derailleur | SRAM NX | SRAM GX Eagle |
| Cassette | SRAM NX | SRAM GX Eagle |
| Chain | KMC X-11 | SRAM GX Eagle |
| Crankset | Race Face Aeffect | TruVativ Stylo |
| Tire | Specialized Ground Control Fat | Bontrager Barbegazi |
| Hub | Specialized Stout Pro 150 | not listed |
| Rim | Specialized Stout XC 80 | not listed |
| Brake | SRAM Level T | SRAM Guide RS |
| Handlebar | Specialized Stout | not listed |
| Grips | Specialized Sip Grip | not listed |
| Saddle | Specialized Henge Comp | Bontrager Montrose Elite |
| Frame | not listed | Trek OCLV |
| Fork | not listed | Bontrager Haru Pro |
| Bottom bracket | not listed | SRAM DUB |
| Wheelset | not listed | Trek Wampa |
| Headset | not listed | FSA IS2 |
| Seatpost | not listed | Bontrager Line |
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