MountainPartial spec

2021 Giant Fathom 2

Lists today at $1,500 (2026-09)

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What a used one is worth

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New

$838

$541 to $1,010

Like new

$796

$514 to $959

Excellent

$754

$487 to $909

Good

$629

$406 to $757

Fair

$461

$298 to $555

For parts

$251

$162 to $303

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

Overview

Brand: Giant
Model family: Fathom
Model year: 2021
Category: Mountain · trail
Frame material: aluminum
Sizes: S, M, L, XL
Wheel size: 27.5
Current list price: $1,500 (as of 2026-09)

Drivetrain

Speeds: 12
Groupset: Shimano Deore
Electronic: false

Build

Fork: Giant Crest 34 RCL, 130mm, Boost 15x110
Stem: Giant Contact TR 35
Tires: Maxxis Ardent Race, tubeless, 27.5x2.6, foldable, TR
Brakes: Tektro TKD143 [F&R] 2-Piston, 180mm Rotors [F&R]
Saddle: Giant Romero
Wheels: Giant AM 27.5 wheelset, alloy, 30mm inner
Cassette: Shimano Deore, 12-speed, 10x51
Crankset: Praxis Cadet Boost, 30t
Seatpost: Giant Contact Switch dropper post with remote, 30.9
Shifters: Shimano Deore
Handlebar: Giant Contact Trail, 35
Rear derailleur: Shimano Deore, Shadow+
Travel front mm: 130

Geometry

L: Reach mm: 470; Stack mm: 631; Chainstay mm: 435; Wheelbase mm: 1203; Head angle deg: 66; Seat angle deg: 75
M: Reach mm: 445; Stack mm: 622; Chainstay mm: 435; Wheelbase mm: 1174; Head angle deg: 66; Seat angle deg: 75
S: Reach mm: 425; Stack mm: 622; Chainstay mm: 435; Wheelbase mm: 1154; Head angle deg: 66; Seat angle deg: 75
XL: Reach mm: 490; Stack mm: 640; Chainstay mm: 435; Wheelbase mm: 1227; Head angle deg: 66; Seat angle deg: 75

Last Giant US MSRP shown on the archived model-year page, observed 2026-09-21; not the launch MSRP (Giant changed this model year's price after launch). Price labels fixed 2026-09-27: moved $1,500 from msrp_usd to list_price_usd (as of 2026-09) and set msrp_usd to null per the Giant model-year price audit.

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