2027 Trek Check-OUT SL vs 2026 Forbidden Puritan Framekit
The S3 is the Forbidden Puritan Framekit size closest to your ML Trek Check-OUT SL. 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 Puritan Framekit
Compared with the Trek Check-OUT SL in ML, the Forbidden Puritan Framekit in S3 places the top of the head tube 13 mm lower and 15 mm further forward, relative to the bottom bracket. Its wheelbase is 26 mm longer, which can contribute to stability at speed.
- Frame stack
- −13 mm
- Lower front end
- Frame reach
- +15 mm
- Longer frame reach
- Wheelbase
- +26 mm
- Longer: steadier at speed
- Head angle
- −1.7°
- Slacker: calmer steering
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
We can't draw these frames yet. The Trek Check-OUT SL numbers we have for size ML are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Check-OUT SL ML | Forbidden Puritan Framekit S3 | Difference |
|---|---|---|---|
| Reach | 417 | 432 | +15 mm |
| Stack | 634 | 621 | −13 mm |
| Head tube angle | 69.4° | 67.75 | −1.7° |
| Effective top tube | 597 | 618 | +21 mm |
| Chainstay length | 442 | not listed | |
| Wheelbase | 1117 | 1143 | +26 mm |
| BB drop | 70 | 71 | +1 mm |
| Standover | 838 | 769 | −69 mm |
| Seat tube length | 520 | 520 | ±0 mm |
| Head tube length | 149 | 140 | −9 mm |
| Seat tube angle | not listed | 73.3 | |
| BB height | not listed | 293 | |
| Fork length | not listed | 460 |
Differences are the Forbidden Puritan Framekit minus the Trek Check-OUT SL. Full charts: 2027 Trek Check-OUT SL, 2026 Forbidden Puritan Framekit.
Where each sits in its class
Trek Check-OUT SLForbidden Puritan Framekit
Each bike is ranked against the other gravel 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 Check-OUT SLSL | Forbidden Puritan FramekitFramekit |
|---|---|---|
| Frame | Trek OCLV | Forbidden Puritan |
| Rear shock | RockShox SIDluxe 3P Ultimate | not listed |
| Fork | not listed | RockShox Rudy |
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