2026 Forbidden Reya Tier vs 2026 Transition Sentinel Alloy
The XL is the Transition Sentinel Alloy size closest to your S4 Forbidden Reya 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 Transition Sentinel Alloy
Compared with the Forbidden Reya Tier in S4, the Transition Sentinel Alloy in XL places the top of the head tube 3 mm higher and 10 mm further forward, relative to the bottom bracket. Its wheelbase is 17 mm longer, which can contribute to stability at speed.
- Frame stack
- +3 mm
- Higher front end
- Frame reach
- +10 mm
- Longer frame reach
- Wheelbase
- +17 mm
- Longer: steadier at speed
- Head angle
- −1.0°
- 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 Forbidden Reya Tier numbers we have for size S4 are missing the chainstay length. The numbers below still compare.
Geometry side by side
| Measurement | Forbidden Reya Tier S4 | Transition Sentinel Alloy XL | Difference |
|---|---|---|---|
| Reach | 495 | 505 | +10 mm |
| Stack | 639 | 642 | +3 mm |
| Head tube angle | 65.0 | 64.0 | −1.0° |
| Seat tube angle | 75.2 | 73.0 | −2.2° |
| Effective top tube | 642 | 632 | −10 mm |
| Wheelbase | 1285 | 1302 | +17 mm |
| BB height | 331 | not listed | |
| Standover | 721 | 705 | −16 mm |
| Seat tube length | 470 | 460 | −10 mm |
| Fork length | 541 | not listed | |
| Head tube length | 135 | 130 | −5 mm |
| Chainstay length | not listed | 448 | |
| BB drop | not listed | 25 |
Differences are the Transition Sentinel Alloy minus the Forbidden Reya Tier. Full charts: 2026 Forbidden Reya Tier, 2026 Transition Sentinel Alloy.
Where each sits in its class
Forbidden Reya TierTransition Sentinel Alloy
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 | Forbidden Reya TierTier 1 | Transition Sentinel AlloyAlloy Eagle 70 |
|---|---|---|
| Frame | Forbidden Reya | Transition Sentinel |
| Fork | Fox 34 Factory | RockShox Psylo |
| Rear shock | Fox Float Factory | RockShox Super Deluxe Base |
| Shifter | SRAM Pod Rocker Controller | SRAM Eagle 70 Transmission |
| Derailleur | SRAM XX XX SL | SRAM Eagle 70 Transmission |
| Cassette | SRAM XX SL Eagle Transmission | SRAM Eagle 70 Transmission |
| Chain | SRAM XX SL | SRAM Eagle 70 Transmission |
| Crankset | SRAM XX SL | SRAM Eagle 70 Transmission |
| Chainring | SRAM 32T | SRAM Eagle 70 Transmission |
| Bottom bracket | SRAM DUB | not listed |
| Battery | SRAM AXS EP Powerpack | not listed |
| Tire | Maxxis Rekon Race | Maxxis Assegai, Maxxis Minion DHR II DD |
| Hub | DT Swiss 240 SPLINE, DT Swiss 240 SPLINE Ratchet EXP | not listed |
| Rim | DT Swiss 1500 | not listed |
| Brake | SRAM Motive Ultimate | SRAM Maven Base |
| Rotor | SRAM HS2 | SRAM CenterLine |
| Handlebar | OneUp Components Carbon | Race Face Chester |
| Stem | BikeYoke Barkeeper Stem | Race Face Aeffect |
| Headset | Cane Creek 40 | FSA No 57E |
| Dropper post | OneUp Components V3 Dropper Post | SDG Tellis Dropper |
| Saddle | fizik Terra Ridon X1 | SDG Bel Air 3 |
| Wheelset | not listed | WTB ST |
| Grips | not listed | ODI Elite Flow |
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