2018 Specialized Stumpjumper ST Men's 27.5 vs 2020 Trek Fuel EX 9.8
The M is the Trek Fuel EX 9.8 size closest to your M Specialized Stumpjumper ST Men's 27.5. 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 Fuel EX 9.8
Compared with the Specialized Stumpjumper ST Men's 27.5 in M, the Trek Fuel EX 9.8 in M places the top of the head tube 15 mm higher and about as far forward, relative to the bottom bracket. Its wheelbase is 8 mm longer, which can contribute to stability at speed.
- Frame stack
- +15 mm
- Higher front end
- Frame reach
- +1 mm
- About the same reach
- Wheelbase
- +8 mm
- Longer: steadier at speed
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- +3 mm
- Longer: more planted
The two frames
Specialized Stumpjumper ST Men's 27.5, MTrek Fuel EX 9.8, MDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Stumpjumper ST Men's 27.5 M | Trek Fuel EX 9.8 M | Difference |
|---|---|---|---|
| Reach | 444mm | 445 | +1 mm |
| Stack | 590mm | 605 | +15 mm |
| Head tube angle | 66.5° | 66.5° | ±0.0° |
| Seat tube angle | 76° | 75.5° | −0.5° |
| Effective top tube | 591mm | 602 | +11 mm |
| Chainstay length | 432mm | 435 | +3 mm |
| Wheelbase | 1170mm | 1178 | +8 mm |
| BB drop | 28mm | 28 | ±0 mm |
| BB height | 325mm | 346 | +21 mm |
| Standover | 735mm | 747 | +12 mm |
| Seat tube length | 410mm | 420 | +10 mm |
| Fork length | 522mm | not listed | |
| Head tube length | 110mm | 100 | −10 mm |
Differences are the Trek Fuel EX 9.8 minus the Specialized Stumpjumper ST Men's 27.5. Full charts: 2018 Specialized Stumpjumper ST Men's 27.5, 2020 Trek Fuel EX 9.8.
Where each sits in its class
Specialized Stumpjumper ST Men's 27.5Trek Fuel EX 9.8
Each bike is ranked against the other trail 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 Stumpjumper ST Men's 27.5Men's S-Works 27.5 | Trek Fuel EX 9.89.8 |
|---|---|---|
| Fork | Fox FLOAT 34 Factory | Fox 36 Performance |
| Rear shock | Fox Float DPS Factory | Fox Float |
| Shifter | SRAM XX1 Eagle | Shimano XT |
| Derailleur | SRAM XX1 Eagle | Shimano XT |
| Cassette | SRAM X01 Eagle | Shimano XT |
| Chain | SRAM XX1 Eagle | Shimano XT M8100 |
| Crankset | SRAM XX1 Eagle | TruVativ Descendant |
| Tire | Specialized Butcher, Specialized Purgatory | Bontrager XR4 Team Issue, Michelin Wild AM |
| Hub | Roval Traverse | not listed |
| Rim | Roval Traverse SL 29 | not listed |
| Brake | SRAM Guide RSC | Shimano XT M8020, Shimano SLX M7120 |
| Stem | Syntace MegaForce 2 | Bontrager Line |
| Grips | Specialized Sip Grip | Bontrager XR Trail |
| Seatpost | Specialized Command Post IRcc | not listed |
| Saddle | Specialized Phenom Expert | Bontrager Arvada |
| Frame | not listed | Trek Fuel EX |
| Chainring | not listed | TruVativ Descendant |
| Bottom bracket | not listed | Shimano MT500 |
| Wheelset | not listed | Bontrager Line |
| Rotor | not listed | Shimano SM-RT66 |
| Handlebar | not listed | Bontrager Line |
| Headset | not listed | Bontrager Knock Block Integrated |
| Dropper post | not listed | Bontrager Line |
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