2026 Trek Fuel LX 9.9 Gen 7 vs 2026 Forbidden Heathen Framekit
The S3 is the Forbidden Heathen Framekit size closest to your L Trek Fuel LX 9.9 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 9.9 Gen 7 in L, the Forbidden Heathen Framekit in S3 places the top of the head tube 8 mm lower and about as far forward, relative to the bottom bracket. Its wheelbase is 41 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −8 mm
- Lower front end
- Frame reach
- +2 mm
- About the same reach
- Wheelbase
- −41 mm
- Shorter: quicker to change direction
- Head angle
- +0.6°
- Steeper: sharper steering
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
Only the Trek Fuel LX 9.9 Gen 7 is drawn. The Forbidden Heathen Framekit numbers we have for size S3 are missing the chainstay length.
Geometry side by side
| Measurement | Trek Fuel LX 9.9 Gen 7 L | Forbidden Heathen Framekit S3 | Difference |
|---|---|---|---|
| Reach | 473 | 475 | +2 mm |
| Stack | 647 | 639 | −8 mm |
| Head tube angle | 63.4° | 64 | +0.6° |
| Seat tube angle | 76.4° | 76 | −0.4° |
| Effective top tube | 621 | 634 | +13 mm |
| Chainstay length | 442 | not listed | |
| Wheelbase | 1273 | 1232.2 | −41 mm |
| BB drop | 27 | not listed | |
| BB height | 347 | 311 | −36 mm |
| Standover | 759 | 740 | −19 mm |
| Seat tube length | 420 | 440 | +20 mm |
| Head tube length | 125 | 110 | −15 mm |
| Fork length | not listed | 541 |
Differences are the Forbidden Heathen Framekit minus the Trek Fuel LX 9.9 Gen 7. Full charts: 2026 Trek Fuel LX 9.9 Gen 7, 2026 Forbidden Heathen Framekit.
Where each sits in its class
Trek Fuel LX 9.9 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.
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