2026 Transition Spire Alloy vs 2024 Specialized Enduro Expert
The S4 is the Specialized Enduro Expert size closest to your L Transition Spire 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 Specialized Enduro Expert
Compared with the Transition Spire Alloy in L, the Specialized Enduro Expert in S4 places the top of the head tube at about the same height and about as far forward, relative to the bottom bracket. Its wheelbase is 13 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +1 mm
- About the same height
- Frame reach
- +2 mm
- About the same reach
- Wheelbase
- −13 mm
- Shorter: quicker to change direction
- Head angle
- +0.9°
- Steeper: sharper steering
- Chainstays
- −4 mm
- Shorter: livelier
The two frames
Transition Spire Alloy, LSpecialized Enduro Expert, S4Drawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Transition Spire Alloy L | Specialized Enduro Expert S4 | Difference |
|---|---|---|---|
| Reach | 485 | 487mm | +2 mm |
| Stack | 628 | 629mm | +1 mm |
| Head tube angle | 63 | 63.9° | +0.9° |
| Seat tube angle | 70.5 | 76° | +5.5° |
| Effective top tube | 605 | not listed | |
| Chainstay length | 446 | 442mm | −4 mm |
| Wheelbase | 1287 | 1274mm | −13 mm |
| BB drop | 25 | not listed | |
| BB height | 350 | not listed | |
| Seat tube length | 430 | 440mm | +10 mm |
| Head tube length | 110 | 110mm | ±0 mm |
Differences are the Specialized Enduro Expert minus the Transition Spire Alloy. Full charts: 2026 Transition Spire Alloy, 2024 Specialized Enduro Expert.
Where each sits in its class
Transition Spire AlloySpecialized Enduro Expert
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 | Transition Spire AlloyAlloy Eagle 70 | Specialized Enduro ExpertExpert |
|---|---|---|
| Frame | Transition Spire | Specialized Enduro |
| Fork | RockShox Domain | RockShox Zeb Select+ |
| Rear shock | RockShox Super Deluxe Base | RockShox Super Deluxe |
| Shifter | SRAM Eagle AXS | SRAM GX Eagle AXS Controller |
| Derailleur | SRAM Eagle 70 Transmission | SRAM GX Eagle AXS |
| Cassette | SRAM Eagle 70 Transmission | SRAM GX Eagle |
| Chain | SRAM Eagle 70 Transmission | SRAM GX Eagle |
| Crankset | SRAM Eagle 70 Transmission | SRAM GX Eagle |
| Chainring | SRAM 30 GX | SRAM Eagle DUB GX |
| Wheelset | WTB ST i30 | Roval Traverse 29 |
| Tire | Maxxis Assegai, Maxxis Minion DHR II DD | Specialized Butcher |
| Brake | SRAM Maven Base | SRAM Code RS |
| Rotor | SRAM CenterLine | SRAM Code RS |
| Handlebar | Race Face Chester | Specialized Trail 7050 alloy |
| Stem | Race Face Aeffect R | Specialized Alloy Trail |
| Grips | ODI Longneck V2.1 | Specialized Deity Grips |
| Headset | FSA NO.55R/57 | not listed |
| Dropper post | SDG Tellis Dropper | not listed |
| Saddle | SDG Bel-Air | Specialized Bridge |
| Bottom bracket | not listed | SRAM DUB |
| Hub | not listed | Roval DT Swiss 370 |
| Rim | not listed | Roval Traverse 29 |
| Seatpost | not listed | Specialized OneUp |
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