2027 Trek Fuel EX Carbon Gen 7 vs 2025 YT Jeffsy CORE
The XXL is the YT Jeffsy CORE size closest to your XXL Trek Fuel EX Carbon Gen 7. 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 YT Jeffsy CORE
Compared with the Trek Fuel EX Carbon Gen 7 in XXL, the YT Jeffsy CORE in XXL places the top of the head tube 23 mm lower and 15 mm further back, relative to the bottom bracket. Its wheelbase is 41 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −23 mm
- Lower front end
- Frame reach
- −15 mm
- Shorter frame reach
- Wheelbase
- −41 mm
- Shorter: quicker to change direction
- Head angle
- +0.5°
- Steeper: sharper steering
- Chainstays
- −10 mm
- Shorter: livelier
The two frames
Trek Fuel EX Carbon Gen 7, XXLYT Jeffsy CORE, XXLDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Trek Fuel EX Carbon Gen 7 XXL | YT Jeffsy CORE XXL | Difference |
|---|---|---|---|
| Reach | 530 | 515 | −15 mm |
| Stack | 665 | 642 | −23 mm |
| Head tube angle | 64.5° | 65 | +0.5° |
| Seat tube angle | 76.4° | 77.2 | +0.8° |
| Effective top tube | 680 | not listed | |
| Chainstay length | 452 | 442 | −10 mm |
| Wheelbase | 1330 | 1289 | −41 mm |
| BB drop | 35 | 33 | −2 mm |
| BB height | 339 | not listed | |
| Standover | 764 | not listed | |
| Seat tube length | 475 | not listed | |
| Head tube length | 155 | not listed |
Differences are the YT Jeffsy CORE minus the Trek Fuel EX Carbon Gen 7. Full charts: 2027 Trek Fuel EX Carbon Gen 7, 2025 YT Jeffsy CORE.
Where each sits in its class
Trek Fuel EX Carbon Gen 7YT Jeffsy CORE
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 | Trek Fuel EX Carbon Gen 7Carbon Gen 7 | YT Jeffsy CORECORE 1 |
|---|---|---|
| Rear shock | Fox Float Factory | Marzocchi Bomber Air |
| Fork | not listed | Marzocchi Bomber Z1 |
| Shifter | not listed | Shimano Deore |
| Derailleur | not listed | Shimano Deore |
| Cassette | not listed | Shimano Deore M6100 |
| Crankset | not listed | Shimano Deore M512 |
| Bottom bracket | not listed | Shimano MT501 |
| Wheelset | not listed | Sun Ringlé SR329 Trail Comp |
| Tire | not listed | Maxxis Minion DHF, Maxxis Minion DHR II DD |
| Brake | not listed | SRAM DB8 Stealth |
| Handlebar | not listed | YT Handlebar 35 |
| Stem | not listed | YT Stem 35 |
| Grips | not listed | ODI Elite Motion V2.1 |
| Headset | not listed | Cane Creek Series 10 |
| Seatpost | not listed | YT Seatpost |
| Saddle | not listed | YT Custom Design |
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