MountainVerified spec

2021 Giant Fathom 1

Launched at $1,650Lists today at $1,850 (2026-09)

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What a used one is worth

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New

$922

$595 to $1,111

Like new

$876

$566 to $1,055

Excellent

$830

$536 to $1,000

Good

$691

$447 to $833

Fair

$507

$327 to $611

For parts

$277

$179 to $333

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
Launch MSRP (US): $1,650
Current list price: $1,850 (as of 2026-09)

Drivetrain

Speeds: 12
Groupset: SRAM NX Eagle
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: [F] Shimano MT420 (4-Piston), 180mm Rotor, [R] Shimano MT400 2-Piston 180mm Rotor
Saddle: Giant Romero
Wheels: Giant AM 27.5 wheelset, alloy, 30mm inner
Cassette: SRAM SX Eagle, 12-speed, 11x50
Crankset: SRAM SX Eagle, DUB, 30t
Seatpost: Giant Contact Switch dropper post with remote, 30.9
Shifters: SRAM SX Eagle
Handlebar: Giant Contact Trail, 35
Rear derailleur: SRAM NX Eagle
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

Price labels fixed 2026-09-27: msrp_usd set to the launch price $1,650 from a launch-season web.archive.org capture of the Giant US product page dated 2020-10-24, and the $1,850 shown on the archived model-year page (observed 2026-09-21) moved to list_price_usd (as of 2026-09).

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