Which size or configuration labels have geometry for the 2025 Transition Spire Carbon?

Geometry is listed for S, M, L, XL, and XXL.

What are the reach and stack of the 2025 Transition Spire Carbon 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 Carbon?

The head tube angle is 63 degrees in every size.

What does the 2025 Transition Spire Carbon 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.

2025

2025 Transition Spire Carbon

Enduro

The 2025 Transition Spire Carbon 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 Carbon GX build comes with SRAM GX Eagle shifting and Race Face Trace 28H / Aeffect R wheels.

Compare with 440+ enduro bikes

Checked Oct 24, 2026.

Key facts

Brand: Transition
Model: Spire
Model year: 2025
Frame: Carbon
Type: Enduro
Geometry labels: S, M, L, XL, and XXL
Drivetrain: SRAM GX Eagle
Fork: Fox 38 Performance Elite
Rear shock: Fox Float X Performance Elite
Wheels: Race Face Trace 28H / Aeffect R
Geometry: Complete for every size
Checked: Oct 24, 2026

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

Geometry drawing, size L, to scale.

2025 Transition Spire Carbon 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
Chainstay length(mm)	446	446	446	452	452
Wheelbase(mm)	1227	1257	1287	1322	1352

Sources agree

How to read a geometry chart

Stock build

22 parts

Frame

Transition Spire

Frame

Suspension

Fox 38 Performance Elite

Fork

Fox Float X Performance Elite

Rear shock

Drivetrain

SRAM GX Eagle

ShifterSpeeds 12

SRAM GX Eagle

Derailleur

SRAM GX Eagle

CassetteSpeeds 12Freehub body SRAM XDWeight 452 g

SRAM GX Eagle

Chain

SRAM GX Eagle

Crankset

SRAM GX Eagle

Chainring

SRAM DUB

Bottom bracket

Wheels & Tires

Race Face Trace 28H / Aeffect R

Wheelset

Schwalbe Magic Mary

Tire

Schwalbe Big Betty

Tire

Race Face Aeffect R

Rim

Brakes

TRP DH-R EVO

BrakePiston count 4Fluid type MineralLever adjustments Index Reach adjusterPad compound resinBrake type Hydraulic

TRP R1

RotorThickness 2.3mm

Cockpit

ANVL Mandrel

Handlebar

ANVL Swage

Stem

ODI Elite Flow

Grips

FSA No.55R/57

Headset

Seatpost & Saddle

OneUp Components dropper post

Seatpost

SDG Bel-Air

Saddle

Keep your Spire Carbon GX in Quiver

Start from this build's stock parts, then record your upgrades. Review it before adding it to your garage.

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Sources agreeManufacturer

Keep the factory build and your current parts distinct

Quick answers

Which size or configuration labels have geometry for the 2025 Transition Spire Carbon?: Geometry is listed for S, M, L, XL, and XXL.
What are the reach and stack of the 2025 Transition Spire Carbon 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 Carbon?: The head tube angle is 63 degrees in every size.
What does the 2025 Transition Spire Carbon 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.