2027 Trek Fuel LX 9.8 Gen 7 vs 2026 Forbidden Heathen Framekit
The S4 is the Forbidden Heathen Framekit size closest to your XXL Trek Fuel LX 9.8 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 Forbidden Heathen Framekit
Compared with the Trek Fuel LX 9.8 Gen 7 in XXL, the Forbidden Heathen Framekit in S4 places the top of the head tube 26 mm lower and 23 mm further back, relative to the bottom bracket. Its wheelbase is 70 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −26 mm
- Lower front end
- Frame reach
- −23 mm
- Shorter frame reach
- Wheelbase
- −70 mm
- Shorter: quicker to change direction
- Head angle
- +0.5°
- Steeper: sharper steering
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
Only the Trek Fuel LX 9.8 Gen 7 is drawn. The Forbidden Heathen Framekit numbers we have for size S4 are missing the chainstay length.
Geometry side by side
| Measurement | Trek Fuel LX 9.8 Gen 7 XXL | Forbidden Heathen Framekit S4 | Difference |
|---|---|---|---|
| Reach | 518 | 495 | −23 mm |
| Stack | 674 | 648 | −26 mm |
| Head tube angle | 63.5° | 64 | +0.5° |
| Seat tube angle | 75.4° | 76 | +0.6° |
| Effective top tube | 684 | 657 | −27 mm |
| Chainstay length | 452 | not listed | |
| Wheelbase | 1341 | 1270.6 | −70 mm |
| BB drop | 27 | not listed | |
| BB height | 346 | 311 | −35 mm |
| Standover | 773 | 764 | −9 mm |
| Seat tube length | 475 | 470 | −5 mm |
| Head tube length | 155 | 120 | −35 mm |
| Fork length | not listed | 541 |
Differences are the Forbidden Heathen Framekit minus the Trek Fuel LX 9.8 Gen 7. Full charts: 2027 Trek Fuel LX 9.8 Gen 7, 2026 Forbidden Heathen Framekit.
Where each sits in its class
Trek Fuel LX 9.8 Gen 7Forbidden Heathen Framekit
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 LX 9.8 Gen 79.8 Eagle 90 Gen 7 | Forbidden Heathen Framekit |
|---|---|---|
| Fork | RockShox ZEB B1 Ultimate | not listed |
| Rear shock | RockShox Vivid D1 Ultimate | not listed |
| Derailleur | SRAM Eagle 90 Transmission | not listed |
| Cassette | SRAM GX Eagle Transmission | not listed |
| Chain | SRAM GX Eagle | not listed |
| Crankset | SRAM Eagle 90 Transmission | not listed |
| Bottom bracket | SRAM DUB | not listed |
| Wheelset | Bontrager Line Comp 30 | not listed |
| Tire | Maxxis Minion DHR II | not listed |
| Brake | SRAM Maven 4-piston Bronze | not listed |
| Rotor | SRAM HS2 | not listed |
| Handlebar | Race Face Turbine | not listed |
| Grips | Trek Line Elite | not listed |
| Seatpost | Bontrager Line Dropper | not listed |
| Saddle | Trek Verse | not listed |
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