MountainVerified spec

2012 Trek 3900 Disc

Launched at $600

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What a used one is worth

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New

$158

$84 to $210

Like new

$150

$80 to $200

Excellent

$142

$75 to $189

Good

$119

$63 to $158

Fair

$87

$46 to $116

For parts

$47

$25 to $63

From the launch price, aged to 2026 and adjusted for condition. Guidance from our catalog, not an appraisal.

Overview

Brand: Trek
Model family: 3 Series
Model year: 2012
Category: Mountain · recreational
Frame material: aluminum
Sizes: 13, 16, 18, 19.5, 21, 22.5
Wheel size: 26
Launch MSRP (US): $600

Drivetrain

Speeds: 8
Groupset: Shimano Acera
Chainrings: 3
Electronic: false
Total gears: 24

Build

Fork: SR Suntour XCM w/30mm stanchions, coil spring & preload, 100mm travel
Stem: Bontrager Forged, 25.4mm
Tires: Bontrager LT3, 26x2.0"
Brakes: Tektro Novela mechanical disc brakes w/Shimano EF51 levers
Saddle: Bontrager SSR
Wheels: Formula DC20 alloy front hub, DC22 alloy rear hub; Bontrager 550 36-hole rims w/brushed sidewalls
Cassette: Shimano HG31 11-32, 8 speed
Crankset: Shimano TX M171, 42/34/24
Seatpost: Bontrager SSR, 31.6mm, 20mm offset
Shifters: Shimano EF51, 8 speed
Handlebar: Bontrager Riser, 25.4mm, 30mm rise
Rear derailleur: Shimano Acera M360
Travel front mm: 100

Geometry

13: Chainstay mm: 430; Wheelbase mm: 1019; Head angle deg: 70.5; Seat angle deg: 74
16: Chainstay mm: 430; Wheelbase mm: 1040; Head angle deg: 70.5; Seat angle deg: 73.5
18: Chainstay mm: 430; Wheelbase mm: 1057; Head angle deg: 70.5; Seat angle deg: 73.5
21: Chainstay mm: 430; Wheelbase mm: 1079; Head angle deg: 70.5; Seat angle deg: 73
19.5: Chainstay mm: 430; Wheelbase mm: 1068; Head angle deg: 70.5; Seat angle deg: 73
22.5: Chainstay mm: 430; Wheelbase mm: 1084; Head angle deg: 70.5; Seat angle deg: 72.5

MSRP read from Trek's own US product page captured 2011-09, inside Trek's model year 2012 season (the page identifies the product by Trek's product id 1017610). Colors: Matte Metallic Black/Matte Cool Grey;Chi Red.

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