Specialized Stumpjumper vs Trek Fuel EX
Choosing between the Specialized Stumpjumper and the Trek Fuel EX? This compares the 2026 Specialized Stumpjumper 15 with the 2026 Trek Fuel EX 9.8 Gen 7, size by size, from the geometry Specialized and Trek publish. Pick any size to compare it in the full tool.
The M is the Trek Fuel EX 9.8 Gen 7 size closest to your S3 Specialized Stumpjumper 15. 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 Gen 7
Compared with the Specialized Stumpjumper 15 in S3, the Trek Fuel EX 9.8 Gen 7 in M places the top of the head tube 6 mm lower and 15 mm further forward, relative to the bottom bracket. Its wheelbase is 8 mm longer, which can contribute to stability at speed.
- Frame stack
- −6 mm
- Lower front end
- Frame reach
- +15 mm
- Longer frame reach
- Wheelbase
- +8 mm
- Longer: steadier at speed
- Head angle
- +0.5°
- Steeper: sharper steering
- Chainstays
- +2 mm
- About the same
Which Trek Fuel EX 9.8 Gen 7 size matches your Specialized Stumpjumper 15
For each Specialized Stumpjumper 15 size, the Trek Fuel EX 9.8 Gen 7 size with the closest frame stack and reach. Stack and reach show how far off it is: the Trek Fuel EX 9.8 Gen 7 minus the Specialized Stumpjumper 15. A geometry match, not a fit recommendation.
| Specialized Stumpjumper 15 size | Closest size | Stack | Reach |
|---|---|---|---|
| S1 | S | −1 mm | +31 mm |
| S2 | S | −11 mm | +11 mm |
| S3 | M | −6 mm | +15 mm |
| S4 | L | −6 mm | +15 mm |
| S5 | XL | −7 mm | +15 mm |
| S6 | XXL | −6 mm | +5 mm |
The two frames
Specialized Stumpjumper 15, S3Trek Fuel EX 9.8 Gen 7, MDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Stumpjumper 15 S3 | Trek Fuel EX 9.8 Gen 7 M | Difference |
|---|---|---|---|
| Reach | 445 | 460 | +15 mm |
| Stack | 630 | 624 | −6 mm |
| Head tube angle | 64 | 64.5° | +0.5° |
| Seat tube angle | 76.5 | 78.3° | +1.8° |
| Effective top tube | 596 | 583 | −13 mm |
| Chainstay length | 435 | 437 | +2 mm |
| Wheelbase | 1217 | 1225 | +8 mm |
| BB drop | 35 | 35 | ±0 mm |
| BB height | 340 | 339 | −1 mm |
| Standover | 745 | 742 | −3 mm |
| Seat tube length | 405 | 400 | −5 mm |
| Fork length | not listed | not listed | |
| Head tube length | 110 | 110 | ±0 mm |
Differences are the Trek Fuel EX 9.8 Gen 7 minus the Specialized Stumpjumper 15. Full charts: 2026 Specialized Stumpjumper 15, 2026 Trek Fuel EX 9.8 Gen 7.
Where each sits in its class
Specialized Stumpjumper 15Trek Fuel EX 9.8 Gen 7
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 15S-Works | Trek Fuel EX 9.8 Gen 79.8 Eagle 90 Gen 7 |
|---|---|---|
| Frame | Specialized FACT 11m | Trek Fuel EX |
| Fork | Fox 36 Float Factory | RockShox Lyrik Ultimate |
| Rear shock | Fox Float X Factory | RockShox Deluxe Ultimate |
| Shifter | Shimano XTR M9250 | SRAM Eagle 90 Transmission |
| Derailleur | Shimano XTR Di2 | SRAM Eagle 90 Transmission |
| Cassette | Shimano XTR | SRAM GX Eagle Transmission |
| Chain | Shimano XTR | not listed |
| Crankset | Shimano XTR | SRAM Eagle 90 Transmission |
| Chainring | Shimano XTR | SRAM Eagle 90 Transmission |
| Bottom bracket | Shimano BB93 | not listed |
| Wheelset | Roval Traverse SL II | Bontrager Line Comp 30 |
| Tire | Specialized Butcher, Specialized Eliminator | Maxxis Minion DHR II |
| Hub | Industry Nine Hydra 2 | not listed |
| Brake | Shimano XTR | SRAM Maven Bronze |
| Rotor | Shimano XTR | not listed |
| Handlebar | Race Face Era Carbon | Race Face ERA |
| Stem | Race Face Turbine R | Bontrager Elite |
| Grips | Deity Lockjaw | Trek Line Elite |
| Dropper post | Fox Transfer NEO Factory | Bontrager Line |
| Saddle | Specialized S-Works Power | Bontrager Verse |