Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Giant
2021 Giant Fathom 1
Value Guide market data · 2021 Giant Fathom 1
12-month trend
12%
Direction and magnitude, not judgment
vs. category average
— %
No category comparison available
Price over time - 2021 Giant Fathom 1
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Fathom model years
2021 Fathom 1 lineup
Overview
About this bike
2021 Giant Fathom 1 value depends on condition, original build, frame material, service history, and current buyer demand.
Specifications
Frameset
- Fork
- Giant Crest 34 RCL, 130mm, Boost 15x110, *note: early production bikes may be substituted with RockShox 35 Silver TK, 130mm, Boost 15x110
- Frame
- ALUXX SL-Grade Aluminum
Drivetrain
- Groupset
- 2021 Giant Fathom 1
- Crankset
- SRAM SX Eagle, DUB, 30t
- Bottom Bracket
- SRAM DUB, press fit
- Chain
- SRAM SX Eagle
- Rear Derailleur
- SRAM NX Eagle
- Shifters
- SRAM SX Eagle
- Cassette/Freewheel
- SRAM SX Eagle, 12-speed, 11x50
Brakes
- Brake Levers
- Shimano MT401, *note: early production bikes may be substituted with Shimano MT201
- Brakes
- Shimano MT420 hydraulic 4-piston, 180mm, *note: early production bikes may be substituted with Shimano MT200 hydraulic, 180mm
Cockpit
- Seatpost
- Giant Contact Switch dropper with remote, 30.9
- Saddle
- Giant Romero
- Stem
- Giant Contact SL 35
- Handlebars
- Giant Contact Trail, 35
Wheels & Tires
- Hubs
- Giant Performance Tracker, [F] Boost 15x110mm [R] Boost 12x148mm
- Rims
- Giant AM 27.5 wheelset, alloy, 30mm inner
- Tires
- Maxxis Ardent Race 27.5x2.6", folding, TR
- Spokes
- Sapim
Pedals
- Pedals
- Sold separately
Accessories
- Color
- Teal
Weight & Sizing
- Size
- Small / Medium / Large
Frame sizing
XS4'10"-5'2"
S5'2"-5'6"
M5'6"-5'10"
L5'10"-6'2"
XL6'2"-6'6"
M highlighted as most common resale size. Sourced from catalog metadata.
Geometry
- Stack
- Varies by size
- Reach
- Varies by size
- Wheelbase
- Varies by size
Industry standard. Sourced from catalog metadata.
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Wheel condition
Inspect rims, hubs, spokes, and bearing play; ask about the tire age and any prior wheel rebuilds.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.
Inspection
Suspension service
Confirm fork lowers and rear shock service intervals; ask for the most recent service receipts.
Inspection
Frame pivots & bearings
Cycle the suspension off the bike to feel for play, grit, or noise in pivot bearings.