Which size or configuration labels have geometry for the 2015 Trek Session DH 27.5?

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

What are the reach and stack of the 2015 Trek Session DH 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 2015 Trek Session DH 27.5?

The head tube angle is 64.2 degrees in every size.

What does the 2015 Trek Session 88 DH 27.5 ship with?

The stock build includes Trek Alpha Platinum, RockShox BoXXer, SRAM X9, and DT Swiss FR2150.

Which years of the Trek Session are on Quiver?

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

2015

2015 Trek Session DH 27.5

Downhill

The 2015 Trek Session DH 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 88 DH 27.5 build comes with SRAM X-0 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: 2015
Frame: DH 27.5
Type: Downhill
Geometry labels: S, M, L, and XL
Drivetrain: SRAM X-0
Fork: RockShox BoXXer
Wheels: DT Swiss FR2150
Geometry: Complete for every size
Source: trekbikes.com
Checked: Oct 11, 2026

Geometry by size

2015 Trek Session DH 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)	14	14	14	14
BB height(mm)	364	364	364	364
Standover(mm)	810	793	790	775
Seat tube length(mm)	390	390	390	390
Head tube length(mm)	115	115	115	115

How to read a geometry chart

Stock build

16 parts

Frame

Trek Alpha Platinum

Frame

Suspension

RockShox BoXXer

ForkTravel 180 / 190 / 200mmOffset 44 / 48 / 52mm

Drivetrain

SRAM X9

ShifterActuation type Mechanical

SRAM X-0

Derailleur

SRAM PG-1050

CassetteSpeeds 10

KMC X10

ChainSpeeds 10

TruVativ Descendant DH

Crankset

Wellgo MG-1

Pedals

Wheels & Tires

DT Swiss FR2150

Wheelset

Bontrager G4 Team Issue

Tire

Brakes

Avid Code

Brake

Cockpit

Bontrager Rhythm Elite

Handlebar

Bontrager Rhythm

Stem

FSA NO.57E

Headset

Seatpost & Saddle

Bontrager Rhythm Elite

Seatpost

Bontrager Evoke 2

Saddle

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Quick answers

Which size or configuration labels have geometry for the 2015 Trek Session DH 27.5?: Geometry is listed for S, M, L, and XL.
What are the reach and stack of the 2015 Trek Session DH 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 2015 Trek Session DH 27.5?: The head tube angle is 64.2 degrees in every size.
What does the 2015 Trek Session 88 DH 27.5 ship with?: The stock build includes Trek Alpha Platinum, RockShox BoXXer, SRAM X9, and DT Swiss FR2150.
Which years of the Trek Session are on Quiver?: Quiver has the Trek Session for 2015, 2027, 2025, 2021, 2020, 2019, 2018, 2017, 2016, 2014, 2013, 2011, 2010, and 2005.