Giant Fathom 2

2017 MountainTrail Manufacturer page

Last known price: $1,070

Prices shown first for United States
Fork travel: 120 mm
Wheels: 27.5″
Drivetrain: 2 × 9 24–38t / 12–36t
Gear range: 475%
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

XS 156–166
SM 163–174
MD 171–182
LG 179–189
XL 185–195

Components

18 of 21 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
- SR Suntour
Rear shock

None

Drivetrain

7 parts

Brakes

2 parts

Wheels and tires

5 parts

Front hub
- Giant
Rear hub
- Giant
Rims
- Giant
Spokes

Stainless Steel, 14g Not identified
Tires
- Maxxis Ardent

Cockpit and contact points

5 parts

Handlebar
- Giant
Pedals

Platform, caged Not identified
Saddle
- Giant
Seatpost
- Tranz-X
YSP-03
Stem
- Giant

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size SM

Table

Reach 411mm

Stack 588mm

Wheelbase 1109mm

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 5 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	392	411	428	444	—
Stackmm	584	588	598	611	625
Top tube lengthmm	565	585	605	625	645
Seat tube lengthmm	370	390	445	480	530
Head tube lengthmm	95	100	110	125	140
Head tube angle	67°	67°	67°	67°	67°
Seat tube angle	73.5°	73.5°	73.5°	73.5°	73.5°
Chainstay lengthmm	425	425	425	425	425
Wheelbasemm	1089	1109	1131	1153	1174
Front centermm	668	688	710	732	753
Bottom bracket dropmm	45	45	45	45	45
Bottom bracket heightmm	310	310	310	310	310
Standover heightmm	697	714	743	753	786
Fork rakemm	42	42	42	42	42
Trailmm	105	105	105	105	105
Stack/reach ratio	1.49	1.43	1.40	1.38	—
Suspension and parts
Crank lengthmm	170	170	175	175	175
Handlebar widthmm	730	730	730	730	730
Stem lengthmm	70	80	90	100	110

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

Suspension

Suspension configuration: Hardtail
Front travel: 120 mm

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 24
Largest chainring: 38
Rear sprockets: 9
Smallest sprocket: 12
Largest sprocket: 36
Lowest gear: 18.3 in
Highest gear: 87.1 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: 2.25″
Wheel material: Aluminum
Wheel size: 27.5″

Technical analysis

3 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: 2017
Sample: 429 bicycles with this information
Coverage: 95.7% of the class

Lowest gear

18.3 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2017
Sample: 416 bicycles with this information
Coverage: 92.8% of the class

Highest gear

87.1 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2017
Sample: 416 bicycles with this information
Coverage: 92.8% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.0 km/h
Highest gear: 33.4 km/h

Total gear range 475%

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: 18.3–87.1 gear inches
Class reference (p10–p90): 16.8–94.9 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2017
Lowest gear: 416 bicycles with this information, 92.8% of the class
Highest gear: 416 bicycles with this information, 92.8% 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 2017 builds

Differences across 2017 builds
Specification	This bicycle Giant Fathom 2	Giant Fathom 1	Giant Fathom 29 1	Giant Fathom 29 2
Suspension
Front travel	120 mm	120 mm	100 mm	100 mm
Drivetrain
Front chainrings	2	1	1	2
Smallest chainring	24	30	28	24
Largest chainring	38	30	28	38
Rear sprockets	9	11	11	9
Smallest sprocket	12	11	11	12
Largest sprocket	36	42	42	36
Lowest gear	18.3 in	19.6 in	19.3 in	19.3 in
Highest gear	87.1 in	75.0 in	73.8 in	91.8 in
Cockpit
Seatpost	Dropper seatpost	Dropper seatpost	Rigid seatpost	Rigid seatpost
Other specifications
Tire width	2.25″	2.25″	2.2″	2.2″
Wheel size	27.5″	27.5″	29″	29″
Bottom bracket standard	Not informed	BB86/BB92	Not informed	Not informed