MountainVerified spec
2021 Giant Fathom 29 1
Launched at $1,650Lists today at $1,600 (2026-09)
Own a 2021 Giant Fathom 29 1?
Track its value in your garage, or list it for sale locally in a few taps.
What a used one is worth
Open the value toolNew
$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
- 29
- Launch MSRP (US)
- $1,650
- Current list price
- $1,600 (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
- [F] Maxxis DHF, tubeless, 29x2.5, WT, foldable, EXO, TR [R] Maxxis Aggressor, tubeless, 29x2.5, WT, foldable, EXO, TR
- Brakes
- [F] Shimano MT420 (4-Piston), 180mm Rotor, [R] Shimano MT400 2-Piston 180mm Rotor
- Saddle
- Giant Romero
- Wheels
- Giant AM 29 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
- 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 2020-10-25, and the $1,600 shown on the archived model-year page (observed 2026-09-21) moved to list_price_usd (as of 2026-09).
For sale now
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Other Fathom builds and years
- 2022 Fathom 1$1,850
- 2022 Fathom 2$1,500
- 2022 Fathom 29 1$1,850
- 2022 Fathom 29 2$1,500
- 2021 Fathom 1$1,650
- 2021 Fathom 2$1,500
- 2021 Fathom 29 2$1,500
- 2020 Fathom 1$1,500
- 2020 Fathom 2$1,200
- 2020 Fathom 29 1$1,500
- 2020 Fathom 29 2$1,200
- 2019 Fathom 1$1,470
- 2019 Fathom 2$1,155
- 2019 Fathom 29 1$1,470
- 2019 Fathom 29 2$1,155
- 2018 Fathom 1$1,480
- 2018 Fathom 2$1,175
- 2018 Fathom 29 1$1,480
- 2018 Fathom 29 2$1,070
- 2017 Fathom 1
- 2017 Fathom 2
- 2017 Fathom 29 1
- 2017 Fathom 29 2