2025
2025 Transition Spire Alloy
The 2025 Transition Spire Alloy sits at the aggressive end of the range for a enduro bike, with a slacker head angle and a shorter rear center. Reach 430 to 535 mm, stack 619 to 646 mm. The Spire Alloy GX build comes with SRAM GX Eagle shifting and Race Face Trace 28H / Aeffect R wheels.
Source: transitionbikes.com. Checked .
Key facts
- Brand
- Transition
- Model
- Spire
- Model year
- 2025
- Frame
- Alloy
- Type
- Enduro
- Geometry labels
- S, M, L, XL, and XXL
- Drivetrain
- SRAM GX Eagle
- Rear shock
- Fox Float X Performance Elite
- Geometry
- Complete for every size
- Checked
Things to know
Compared with other enduro bikes on frame geometry alone.
- Slacker head angle than 9 in 10 enduro bikes: 63 degrees, where most sit near 64.4.
- Less stack relative to reach than 9 in 10 enduro bikes: stack-to-reach ratio is 1.29, compared with 1.36 for this group.
Ride spectrum
Where the Spire sits among 440+ enduro bikes, on frame geometry.
AggressivePositionUpright
CalmSteeringQuick
PlayfulBalancePlanted
Geometry by size
| Measurement | S | M | L | XL | XXL |
|---|---|---|---|---|---|
| Reach(mm) | 430 | 460 | 485 | 510 | 535 |
| Stack(mm) | 619 | 619 | 628 | 637 | 646 |
| Head tube angle(°) | 63 | 63 | 63 | 63 | 63 |
| Seat tube angle(°) | 79.6 | 78.8 | 78.1 | 77.5 | 77.2 |
| Effective top tube(mm) | 547 | 577 | 605 | 633 | 661 |
| Chainstay length(mm) | 446 | 446 | 446 | 452 | 452 |
| Wheelbase(mm) | 1227 | 1257 | 1287 | 1322 | 1352 |
| BB drop(mm) | 25 | 25 | 25 | 25 | 25 |
| BB height(mm) | 350 | 350 | 350 | 350 | 350 |
| Seat tube length(mm) | 360 | 390 | 430 | 460 | 490 |
✓Sources agree
Stock build
23 parts
Frame
Transition Spire
Suspension
Fox 38 Performance Elite
Fox Float X Performance Elite
Drivetrain
Wheels & Tires
Schwalbe Magic Mary
Schwalbe Big Betty
Race Face Trace
Race Face Aeffect R
Brakes
TRP DH-R EVO
TRP R1
Cockpit
ANVL Mandrel
ANVL Swage
ODI Elite Flow
FSA No.55R/57
Seatpost & Saddle
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✓Sources agreeMManufacturer
Quick answers
- Which size or configuration labels have geometry for the 2025 Transition Spire Alloy?
- Geometry is listed for S, M, L, XL, and XXL.
- What are the reach and stack of the 2025 Transition Spire Alloy in size L?
- In size L, reach is 485 mm and stack is 628 mm.
- What is the head tube angle of the 2025 Transition Spire Alloy?
- The head tube angle is 63 degrees in every size.
- What does the 2025 Transition Spire Alloy GX ship with?
- The stock build includes Transition Spire, Fox 38 Performance Elite, SRAM GX Eagle, and Race Face Trace 28H / Aeffect R.
- Which years of the Transition Spire are on Quiver?
- Quiver has the Transition Spire for 2025 and 2026.
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