2026
2026 Transition Spire Alloy
The 2026 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 Eagle 70 build comes with SRAM Eagle 70 Transmission shifting and WTB ST i30 wheels.
Source: transitionbikes.com. Checked .
Key facts
- Brand
- Transition
- Model
- Spire
- Model year
- 2026
- Frame
- Alloy
- Type
- Enduro
- Geometry labels
- S, M, L, XL, and XXL
- Drivetrain
- Varies by build
- Fork
- Varies by build
- Rear shock
- Varies by build
- Wheels
- Varies by build
- Geometry
- Complete for every size
- Source
- transitionbikes.com
- Checked
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(°) | 70.5 | 70.5 | 70.5 | 70.5 | 70.5 |
| 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 |
| Head tube length(mm) | 100 | 100 | 110 | 120 | 130 |
Stock build
Spire Alloy Eagle 70
Frame
Transition Spire
Suspension
RockShox Super Deluxe Base
Drivetrain
Wheels & Tires
Brakes
Cockpit
Seatpost & Saddle
SDG Tellis Dropper
Keep your Spire Alloy Eagle 70 in Quiver
Start from this build's stock parts, then record your upgrades. Review it before adding it to your garage.
Free on App StoreFree on Google PlayFree for your first bike, on iPhone and Android.Already have Quiver? Open this build
Spire Alloy Eagle 90
Frame
Transition Spire
Suspension
RockShox Zeb Ultimate Charger 3 RC2
RockShox Super Deluxe Ultimate Trunnion
Drivetrain
SRAM Eagle AXS
SRAM 1275
Wheels & Tires
Brakes
Cockpit
Seatpost & Saddle
Keep your Spire Alloy Eagle 90 in Quiver
Start from this build's stock parts, then record your upgrades. Review it before adding it to your garage.
Free on App StoreFree on Google PlayFree for your first bike, on iPhone and Android.Already have Quiver? Open this build
✓Sources agreeMManufacturer
Quick answers
- Which size or configuration labels have geometry for the 2026 Transition Spire Alloy?
- Geometry is listed for S, M, L, XL, and XXL.
- What are the reach and stack of the 2026 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 2026 Transition Spire Alloy?
- The head tube angle is 63 degrees in every size.
- What does the 2026 Transition Spire Alloy Eagle 70 ship with?
- The stock build includes Transition Spire, RockShox Domain, SRAM Eagle AXS, and WTB ST i30.
- Which years of the Transition Spire are on Quiver?
- Quiver has the Transition Spire for 2026.
Know what is on every bike.
Add your bike to Quiver. Keep its parts, setup, and service history together, then share your build.
Explore the app
