2027 Trek Fuel EX Gen 7 vs 2025 YT Jeffsy CORE
The XXL is the YT Jeffsy CORE size closest to your XL Trek Fuel EX 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 Gen 7 in XL, the YT Jeffsy CORE in XXL places the top of the head tube 9 mm lower and 5 mm further forward, relative to the bottom bracket. Its wheelbase is 9 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −9 mm
- Lower front end
- Frame reach
- +5 mm
- Longer frame reach
- Wheelbase
- −9 mm
- Shorter: quicker to change direction
- Head angle
- +0.5°
- Steeper: sharper steering
- Chainstays
- −5 mm
- Shorter: livelier
The two frames
Trek Fuel EX Gen 7, XLYT Jeffsy CORE, XXLDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Trek Fuel EX Gen 7 XL | YT Jeffsy CORE XXL | Difference |
|---|---|---|---|
| Reach | 510 | 515 | +5 mm |
| Stack | 651 | 642 | −9 mm |
| Head tube angle | 64.5° | 65 | +0.5° |
| Seat tube angle | 76.9° | 77.2 | +0.3° |
| Effective top tube | 651 | not listed | |
| Chainstay length | 447 | 442 | −5 mm |
| Wheelbase | 1298 | 1289 | −9 mm |
| BB drop | 35 | 33 | −2 mm |
| BB height | 339 | not listed | |
| Standover | 758 | not listed | |
| Seat tube length | 455 | not listed | |
| Head tube length | 140 | not listed |
Differences are the YT Jeffsy CORE minus the Trek Fuel EX Gen 7. Full charts: 2027 Trek Fuel EX Gen 7, 2025 YT Jeffsy CORE.
Where each sits in its class
Trek Fuel EX 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 Gen 75 Gen 7 | YT Jeffsy CORECORE 1 |
|---|---|---|
| Frame | Trek Alpha NEXT Platinum | not listed |
| Fork | RockShox Recon | Marzocchi Bomber Z1 |
| Rear shock | RockShox Deluxe Select | Marzocchi Bomber Air |
| Shifter | Shimano Deore M6200 | Shimano Deore |
| Derailleur | Shimano Deore M6200 | Shimano Deore |
| Cassette | Shimano Deore M6200 | Shimano Deore M6100 |
| Chain | Shimano Deore M6100 | not listed |
| Crankset | Shimano Deore MT520 | Shimano Deore M512 |
| Bottom bracket | Shimano MT501 | Shimano MT501 |
| Wheelset | Bontrager Line TLR 30 | Sun Ringlé SR329 Trail Comp |
| Tire | Bontrager Gunnison Elite XR | Maxxis Minion DHF, Maxxis Minion DHR II DD |
| Hub | Shimano TC500 | not listed |
| Rim | Bontrager Line TLR 30 | not listed |
| Brake | Shimano MT200/MT201 | SRAM DB8 Stealth |
| Rotor | Shimano SM-RT10 | not listed |
| Handlebar | Bontrager Comp | YT Handlebar 35 |
| Stem | Bontrager Comp | YT Stem 35 |
| Grips | Trek Line | ODI Elite Motion V2.1 |
| Headset | FSA Orbit | Cane Creek Series 10 |
| Dropper post | TranzX JD-YSI | not listed |
| Seatpost | TranzX JD-YSI34 | YT Seatpost |
| Saddle | Bontrager Verse | YT Custom Design |
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