Which size or configuration labels have geometry for the 2019 Trek Session 27.5?

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

What are the reach and stack of the 2019 Trek Session 27.5 in size L?

In size L, reach is 432 mm and stack is 603 mm.

What is the head tube angle of the 2019 Trek Session 27.5?

The head tube angle is 64.2 degrees in every size.

What does the 2019 Trek Session 8 27.5 ship with?

The stock build includes Trek Alpha Platinum, RockShox BoXXer RC, SRAM GX DH, and Bontrager Line DH 30.

Which years of the Trek Session are on Quiver?

Quiver has the Trek Session for 2019, 2027, 2025, 2021, 2020, 2018, 2017, 2016, 2015, 2014, 2013, 2011, 2010, and 2005.

2019

2019 Trek Session 27.5

Downhill

The 2019 Trek Session 27.5 sits at the upright end of the range for a downhill bike. Reach 389 to 456 mm, stack 603 to 603 mm. The Session 8 27.5 build comes with SRAM GX DH shifting and Bontrager Line DH 30 wheels.

Compare with 180+ dh bikes

Source: trekbikes.com. Checked Oct 12, 2026.

Key facts

Brand: Trek
Model: Session
Model year: 2019
Frame: 27.5
Type: Downhill
Geometry labels: S, M, L, and XL
Drivetrain: SRAM GX DH
Fork: RockShox BoXXer RC
Wheels: Bontrager Line DH 30
Geometry: Complete for every size
Source: trekbikes.com
Checked: Oct 12, 2026

Geometry by size

2019 Trek Session 27.5 geometry by size
Measurement	S	M	L	XL
Reach(mm)	389	408	432	456
Stack(mm)	603	603	603	603
Head tube angle(°)	64.2	64.2	64.2	64.2
Effective top tube(mm)	570	590	614	638
Chainstay length(mm)	443	443	443	443
Wheelbase(mm)	1185	1205	1229	1253
BB drop(mm)	9	9	9	9
BB height(mm)	364	364	364	364
Standover(mm)	810	793	790	775
Seat tube length(mm)	426	426	456	456
Head tube length(mm)	115	115	115	115

How to read a geometry chart

Stock build

17 parts

Frame

Trek Alpha Platinum

Frame

Suspension

RockShox BoXXer RC

Fork

Drivetrain

SRAM GX DH

ShifterSpeeds 7

SRAM GX DH

Derailleur

SRAM GX DH

Cassette

SRAM PC1110

Chain

TruVativ Descendant

CranksetSpindle / BB interface 30mmMaterial Aluminum

SRAM TM

Bottom bracket

Wellgo BO-87B

Pedals

Wheels & Tires

Bontrager Line DH 30

Wheelset

Bontrager G4 Team Issue

Tire

Brakes

SRAM Guide R

BrakePiston count 4Brake type disc

Cockpit

Bontrager Line

HandlebarMaterial Aluminum

Bontrager Line

StemSteerer diameter 1.5"

FSA Orbit

HeadsetStandard (SHIS) ZS

Seatpost & Saddle

Bontrager Rhythm Elite

Seatpost

Bontrager Arvada

Saddle

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Manufacturer

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Quick answers

Which size or configuration labels have geometry for the 2019 Trek Session 27.5?: Geometry is listed for S, M, L, and XL.
What are the reach and stack of the 2019 Trek Session 27.5 in size L?: In size L, reach is 432 mm and stack is 603 mm.
What is the head tube angle of the 2019 Trek Session 27.5?: The head tube angle is 64.2 degrees in every size.
What does the 2019 Trek Session 8 27.5 ship with?: The stock build includes Trek Alpha Platinum, RockShox BoXXer RC, SRAM GX DH, and Bontrager Line DH 30.
Which years of the Trek Session are on Quiver?: Quiver has the Trek Session for 2019, 2027, 2025, 2021, 2020, 2018, 2017, 2016, 2015, 2014, 2013, 2011, 2010, and 2005.