2025 Transition Scout Alloy vs 2026 Transition Sentinel Alloy
The S is the Transition Sentinel Alloy size closest to your XS Transition Scout Alloy. 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 Transition Scout Alloy in XS, the Transition Sentinel Alloy in S places the top of the head tube 38 mm higher and 20 mm further forward, relative to the bottom bracket. Its wheelbase is 55 mm longer, which can contribute to stability at speed.
- Frame stack
- +38 mm
- Higher front end
- Frame reach
- +20 mm
- Longer frame reach
- Wheelbase
- +55 mm
- Longer: steadier at speed
- Head angle
- ±0.0°
- About the same head angle
- Chainstays
- +12 mm
- Longer: more planted
The two frames
Transition Scout Alloy, XSTransition Sentinel Alloy, SDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Transition Scout Alloy XS | Transition Sentinel Alloy S | Difference |
|---|---|---|---|
| Reach | 410 | 430 | +20 mm |
| Stack | 577 | 615 | +38 mm |
| Head tube angle | 64.0 | 64.0 | ±0.0° |
| Seat tube angle | 72 | 73.0 | +1.0° |
| Effective top tube | 534 | 549 | +15 mm |
| Chainstay length | 430 | 442 | +12 mm |
| Wheelbase | 1153 | 1208 | +55 mm |
| BB drop | 18 | 25 | +7 mm |
| BB height | 337 | not listed | |
| Standover | 665 | 690 | +25 mm |
| Seat tube length | 350 | 360 | +10 mm |
| Head tube length | 95 | 100 | +5 mm |
Differences are the Transition Sentinel Alloy minus the Transition Scout Alloy. Full charts: 2025 Transition Scout Alloy, 2026 Transition Sentinel Alloy.
Where each sits in its class
Transition Scout AlloyTransition 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 | Transition Scout AlloyAlloy Deore | Transition Sentinel AlloyAlloy Eagle 70 |
|---|---|---|
| Frame | Transition Scout | Transition Sentinel |
| Fork | RockShox Psylo Gold | RockShox Psylo |
| Rear shock | RockShox Deluxe Select+ | RockShox Super Deluxe Base |
| Shifter | Shimano Deore | SRAM Eagle 70 Transmission |
| Derailleur | Shimano Deore | SRAM Eagle 70 Transmission |
| Cassette | Shimano Deore M6100 | SRAM Eagle 70 Transmission |
| Chain | Shimano Deore XT | SRAM Eagle 70 Transmission |
| Crankset | Shimano Deore M6100 | SRAM Eagle 70 Transmission |
| Wheelset | Novatec D791SB/D902SB with WTB ST i30 | WTB ST |
| Tire | Maxxis Minion DHR II DD | Maxxis Assegai, Maxxis Minion DHR II DD |
| Brake | Shimano Deore XT | SRAM Maven Base |
| Rotor | Shimano Deore M6120 | SRAM CenterLine |
| Handlebar | Race Face Chester | Race Face Chester |
| Stem | Race Face Aeffect R | Race Face Aeffect |
| Grips | ODI Elite Flow | ODI Elite Flow |
| Headset | FSA 57E | FSA No 57E |
| Dropper post | SDG Tellis Dropper | SDG Tellis Dropper |
| Saddle | SDG Bel Air 3 | SDG Bel Air 3 |
| Chainring | not listed | SRAM Eagle 70 Transmission |
Know what is on every bike.
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