2026 Trek Fuel EX 9.9 Gen 7 vs 2025 YT Jeffsy CORE
The YT Jeffsy CORE size closest to your L is the XL. Compare the XL instead
What changes on the YT Jeffsy CORE
Compared with the Trek Fuel EX 9.9 Gen 7 in L, the YT Jeffsy CORE in L places the top of the head tube 11 mm lower and 10 mm further back, relative to the bottom bracket. Its wheelbase is 24 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −11 mm
- Lower front end
- Frame reach
- −10 mm
- Shorter frame reach
- Wheelbase
- −24 mm
- Shorter: quicker to change direction
- Head angle
- +0.5°
- Steeper: sharper steering
- Chainstays
- −5 mm
- Shorter: livelier
The two frames
Trek Fuel EX 9.9 Gen 7, LYT Jeffsy CORE, LDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Trek Fuel EX 9.9 Gen 7 L | YT Jeffsy CORE L | Difference |
|---|---|---|---|
| Reach | 485 | 475 | −10 mm |
| Stack | 638 | 627 | −11 mm |
| Head tube angle | 64.5° | 65 | +0.5° |
| Seat tube angle | 77.4° | 77.2 | −0.2° |
| Effective top tube | 617 | not listed | |
| Chainstay length | 442 | 437 | −5 mm |
| Wheelbase | 1262 | 1238 | −24 mm |
| BB drop | 35 | 33 | −2 mm |
| BB height | 339 | not listed | |
| Standover | 749 | not listed | |
| Seat tube length | 420 | not listed | |
| Head tube length | 125 | not listed |
Differences are the YT Jeffsy CORE minus the Trek Fuel EX 9.9 Gen 7. Full charts: 2026 Trek Fuel EX 9.9 Gen 7, 2025 YT Jeffsy CORE.
Where each sits in its class
Trek Fuel EX 9.9 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 9.9 Gen 79.9 X0 AXS Gen 7 | YT Jeffsy CORECORE 1 |
|---|---|---|
| Fork | RockShox Lyrik Ultimate | Marzocchi Bomber Z1 |
| Rear shock | RockShox Deluxe RC2T Ultimate | Marzocchi Bomber Air |
| Shifter | SRAM Pod Controller | Shimano Deore |
| Derailleur | SRAM X0 Eagle AXS | Shimano Deore |
| Cassette | SRAM X0 Eagle Transmission | Shimano Deore M6100 |
| Chain | SRAM X0 Eagle | not listed |
| Crankset | SRAM X0 Eagle | Shimano Deore M512 |
| Battery | SRAM AXS | not listed |
| Wheelset | Bontrager Line Pro 30 | Sun Ringlé SR329 Trail Comp |
| Tire | Maxxis Minion DHF | Maxxis Minion DHF, Maxxis Minion DHR II DD |
| Brake | SRAM Maven | SRAM DB8 Stealth |
| Rotor | SRAM HS2 | not listed |
| Handlebar | Race Face ERA | YT Handlebar 35 |
| Stem | Race Face Turbine | YT Stem 35 |
| Grips | Trek Line Elite | ODI Elite Motion V2.1 |
| Seatpost | RockShox Reverb AXS | YT Seatpost |
| Saddle | Trek Verse | YT Custom Design |
| Bottom bracket | not listed | Shimano MT501 |
| Headset | not listed | Cane Creek Series 10 |
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