Which size or configuration labels have geometry for the 2017 Trek Session 27.5?

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

What are the reach and stack of the 2017 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 2017 Trek Session 27.5?

The head tube angle is 64.2 degrees in every size.

What does the 2017 Trek Session 8 27.5 ship with?

The stock build includes Trek Alpha Platinum, RockShox BoXXer RC, SRAM GX DH, and DT Swiss FR2150.

Which years of the Trek Session are on Quiver?

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

2017

2017 Trek Session 27.5

Downhill

The 2017 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 shifting and DT Swiss FR2150 wheels.

Compare with 180+ dh bikes

Source: trekbikes.com. Checked Oct 11, 2026.

Key facts

Brand: Trek
Model: Session
Model year: 2017
Frame: 27.5
Type: Downhill
Geometry labels: S, M, L, and XL
Drivetrain: SRAM GX
Fork: RockShox BoXXer RC
Wheels: DT Swiss FR2150
Geometry: Complete for every size
Source: trekbikes.com
Checked: Oct 11, 2026

Geometry by size

2017 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)	762	756	752	757
Seat tube length(mm)	412	445	445	483
Head tube length(mm)	150	150	150	150

How to read a geometry chart

Stock build

15 parts

Frame

Trek Alpha Platinum

Frame

Suspension

RockShox BoXXer RC

Fork

Drivetrain

Shifter

Derailleur

Cassette

Chain

CranksetMaterial Aluminum

Wellgo BO-87B

Pedals

Wheels & Tires

DT Swiss FR2150

Wheelset

Bontrager G4 Team Issue

Tire

Brakes

SRAM Guide R

BrakePiston count 4Brake type disc

Cockpit

Bontrager Rhythm Elite

Handlebar

FSA Orbit

HeadsetStandard (SHIS) ZS

Seatpost & Saddle

Bontrager Rhythm Elite

Seatpost

Bontrager Evoke 2

Saddle

Keep your Session 8 27.5 in Quiver

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

Free on App Store Free on Google PlayFree for your first bike, on iPhone and Android.

Already have Quiver? Open this build

Manufacturer

Keep the factory build and your current parts distinct

Quick answers

Which size or configuration labels have geometry for the 2017 Trek Session 27.5?: Geometry is listed for S, M, L, and XL.
What are the reach and stack of the 2017 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 2017 Trek Session 27.5?: The head tube angle is 64.2 degrees in every size.
What does the 2017 Trek Session 8 27.5 ship with?: The stock build includes Trek Alpha Platinum, RockShox BoXXer RC, SRAM GX DH, and DT Swiss FR2150.
Which years of the Trek Session are on Quiver?: Quiver has the Trek Session for 2017, 2027, 2025, 2021, 2020, 2019, 2018, 2016, 2015, 2014, 2013, 2011, 2010, and 2005.