Which size or configuration labels have geometry for the 2021 Trek Allant+ 8S?

Geometry is listed for M, L, and XL.

What are the reach and stack of the 2021 Trek Allant+ 8S in size L?

In size L, reach is 408 mm and stack is 652 mm.

What is the head tube angle of the 2021 Trek Allant+ 8S?

The head tube angle is 70.0 degrees in size L.

What does the 2021 Trek Allant+ 8S ship with?

The stock build includes Trek High-performance, Trek Allant+, Shimano Deore M4100, and Bosch Performance.

Which years of the Trek Allant+ 8S are on Quiver?

Quiver has the Trek Allant+ 8S for 2021, 2023, 2022, and 2020.

2021

2021 Trek Allant+ 8S

E-bike

Reach 405 to 412 mm, stack 623 to 688 mm. The Allant+ 8S build comes with Shimano Deore M5120 shifting and Bontrager E6 Hard-Case Lite tires.

Compare geometry

Source: trekbikes.com. Checked Oct 7, 2026.

Key facts

Brand: Trek
Model: Allant+ 8S
Model year: 2021
Geometry labels: M, L, and XL
Drivetrain: Shimano Deore M5120
Fork: Trek Allant+
Geometry: Complete for every size
Source: trekbikes.com
Checked: Oct 7, 2026

Geometry by size

2021 Trek Allant+ 8S geometry by size
Measurement	M	L	XL
Reach(mm)	405	408	412
Stack(mm)	623	652	688
Head tube angle(°)	69.5	70.0	70.5
Effective top tube(mm)	595	607	622
Chainstay length(mm)	487	487	487
Wheelbase(mm)	1146	1150	1164
BB drop(mm)	60	60	60
BB height(mm)	295	295	295
Standover(mm)	795	837	879
Seat tube length(mm)	446	491	534
Head tube length(mm)	165	195	230

How to read a geometry chart

Stock build

13 parts

Frame

Trek High-performance

Frame

Suspension

Trek Allant+

Fork

Drivetrain

Shifter

Derailleur

Cassette

Chain

Pedals

Powertrain

Bosch Performance

Motor

Bosch PowerTube 625

Battery

Wheels & Tires

Bontrager E6 Hard-Case Lite

Tire

Alex Rims MD35 27.5

Rim

Brakes

Shimano MT520 4-Piston

Brake

Cockpit

FSA IS2

Headset

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Quick answers

Which size or configuration labels have geometry for the 2021 Trek Allant+ 8S?: Geometry is listed for M, L, and XL.
What are the reach and stack of the 2021 Trek Allant+ 8S in size L?: In size L, reach is 408 mm and stack is 652 mm.
What is the head tube angle of the 2021 Trek Allant+ 8S?: The head tube angle is 70.0 degrees in size L.
What does the 2021 Trek Allant+ 8S ship with?: The stock build includes Trek High-performance, Trek Allant+, Shimano Deore M4100, and Bosch Performance.
Which years of the Trek Allant+ 8S are on Quiver?: Quiver has the Trek Allant+ 8S for 2021, 2023, 2022, and 2020.