2025 Forbidden Dreadnought Tier vs 2026 Propain Tyee 6.1 AL Trail Base
The XL is the Propain Tyee 6.1 AL Trail Base size closest to your S4 Forbidden Dreadnought Tier. 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 Propain Tyee 6.1 AL Trail Base
Compared with the Forbidden Dreadnought Tier in S4, the Propain Tyee 6.1 AL Trail Base in XL places the top of the head tube 15 mm lower and 9 mm further forward, relative to the bottom bracket. Its wheelbase is 38 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- −15 mm
- Lower front end
- Frame reach
- +9 mm
- Longer frame reach
- Wheelbase
- −38 mm
- Shorter: quicker to change direction
- Head angle
- +1.1°
- Steeper: sharper steering
- Chainstays
- −29 mm
- Shorter: livelier
The two frames
Forbidden Dreadnought Tier, S4Propain Tyee 6.1 AL Trail Base, XLDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Forbidden Dreadnought Tier S4 | Propain Tyee 6.1 AL Trail Base XL | Difference |
|---|---|---|---|
| Reach | 491 | 500mm | +9 mm |
| Stack | 659 | 644mm | −15 mm |
| Head tube angle | 63.1 | 64.2 | +1.1° |
| Seat tube angle | 77.1 | 77 | −0.1° |
| Effective top tube | 641 | 649mm | +8 mm |
| Chainstay length | 475 | 446mm | −29 mm |
| Wheelbase | 1330.0 | 1292mm | −38 mm |
| BB drop | -19.6 | not listed | |
| BB height | 341 | 342mm | +1 mm |
| Standover | 780 | not listed | |
| Seat tube length | 470 | 480mm | +10 mm |
| Head tube length | 135 | not listed |
Differences are the Propain Tyee 6.1 AL Trail Base minus the Forbidden Dreadnought Tier. Full charts: 2025 Forbidden Dreadnought Tier, 2026 Propain Tyee 6.1 AL Trail Base.
Where each sits in its class
Forbidden Dreadnought TierPropain Tyee 6.1 AL Trail Base
Each bike is ranked against the other enduro 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 | Forbidden Dreadnought TierTier 1 | Propain Tyee 6.1 AL Trail BaseBase |
|---|---|---|
| Frame | Forbidden Dreadnought V2 | Propain Tyee 6.1 AL Trail |
| Fork | RockShox ZEB Ultimate | 160mm travel aluminum |
| Rear shock | RockShox Vivid Ultimate | 130mm travel |
| Shifter | SRAM Pod Rocker Controller | not listed |
| Derailleur | SRAM X0 Eagle Transmission | not listed |
| Cassette | SRAM X0 Eagle Transmission | not listed |
| Chain | SRAM X0 Eagle Transmission | not listed |
| Crankset | SRAM X0 Eagle | not listed |
| Chainring | SRAM X0 Eagle | not listed |
| Bottom bracket | SRAM DUB | not listed |
| Wheelset | crankbrothers Synthesis 11 | 700C/29" wheels |
| Tire | Maxxis Assegai, Maxxis Forekaster | 2.4" width |
| Brake | SRAM Maven Ultimate | not listed |
| Rotor | SRAM HS2 | not listed |
| Handlebar | Burgtec Ride Wide Enduro | not listed |
| Stem | OneUp Components Forged | not listed |
| Grips | Forbidden lock-on | not listed |
| Headset | Cane Creek Hellbender 70 | not listed |
| Dropper post | OneUp Components Dropper | not listed |
| Seatpost | OneUp Components Setback | not listed |
| Saddle | fizik Terra Alpaca X5 | not listed |
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