Giant Fathom 1

2020 MountainTrail Manufacturer page

Giant Fathom 1, color Gunmetal Black / Olive Green

Last known price: $1,500

Prices shown first for United States
Fork travel: 120 mm
Wheels: 27.5″
Drivetrain: 1 × 11 30t / 11–50t
Gear range: 455%
Weight: 13.48 kg 29.7 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 163–173
MD 170–181
LG 178–189
XL 186–198

Components

18 of 19 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

ALUXX SL-Grade Aluminum Not identified

Suspension

2 parts

Fork
- RockShox Recon RL
Rear shock

None

Drivetrain

7 parts

Brakes

2 parts

Brake levers
- Shimano BL-MT401
BL-MT401
Brakes
- Shimano BR-MT400
BR-MT400

Wheels and tires

5 parts

Cockpit and contact points

5 parts

Handlebar
- Giant
Pedals

None
Saddle
- Giant
Seatpost
- Giant
Stem
- Giant

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 428mm

Stack 598mm

Wheelbase 1131mm

Head angle 67.0°

Seat angle 73.5°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 27.5″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 4 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	411	428	444	460
Stackmm	588	598	611	625
Top tube lengthmm	585	605	625	645
Seat tube lengthmm	390	445	480	530
Head tube lengthmm	100	110	125	140
Head tube angle	67°	67°	67°	67°
Seat tube angle	73.5°	73.5°	73.5°	73.5°
Chainstay lengthmm	425	425	425	425
Wheelbasemm	1110	1131	1153	1174
Front centermm	689	710	732	753
Bottom bracket dropmm	45	45	45	45
Bottom bracket heightmm	310	310	310	310
Standover heightmm	691	731	745	784
Fork rakemm	42	42	42	42
Trailmm	108.2	108.2	108.2	108.2
Stack/reach ratio	1.43	1.40	1.38	1.36
Suspension and parts
Crank lengthmm	170	175	175	175
Handlebar widthmm	780	780	780	780
Stem lengthmm	40	50	60	70

Not published by the manufacturer: Front travel, Rear travel, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Bicycle weight: 13.48 kg

29.7 lb

Suspension

Suspension configuration: Hardtail
Front travel: 120 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 11
Smallest sprocket: 11
Largest sprocket: 50
Lowest gear: 16.5 in
Highest gear: 75.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Dropper seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Air
Tire width: 2.6″
Wheel material: Aluminum
Wheel size: 27.5″

Technical analysis

4 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Front travel

120 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2020
Sample: 1,348 bicycles with this information
Coverage: 93.8% of the class

Lowest gear

16.5 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2020
Sample: 1,217 bicycles with this information
Coverage: 84.6% of the class

Highest gear

75.0 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2020
Sample: 1,217 bicycles with this information
Coverage: 84.6% of the class

Shifting

Mechanical

55 of 1,437 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2020
Sample: 1,437 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.3 km/h
Highest gear: 28.7 km/h

Total gear range 455%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 16.5–75.0 gear inches
Class reference (p10–p90): 17.1–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2020
Lowest gear: 1217 bicycles with this information, 84.6% of the class
Highest gear: 1217 bicycles with this information, 84.6% of the class

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2020 builds
Specification	This bicycle Giant Fathom 1	Giant Fathom 2	Giant Fathom 29 1	Giant Fathom 29 2
Frame
Bicycle weight	13.48 kg	13.1 kg	13.14 kg	Not informed
Suspension
Front travel	120 mm	120 mm	100 mm	100 mm
Drivetrain
Lowest gear	16.5 in	16.5 in	17.4 in	17.4 in
Highest gear	75.0 in	75.0 in	79.1 in	79.1 in
Cockpit
Seatpost	Dropper seatpost	Dropper seatpost	Dropper seatpost	Rigid seatpost
Other specifications
Tire width	2.6″	2.6″	2.35″	2.35″
Wheel size	27.5″	27.5″	29″	29″