Giant Fathom 2

2023 MountainTrail Manufacturer page

Fork travel: 130 mm
Wheels: 27.5″
Drivetrain: 1 × 10 30t / 11–46t
Gear range: 418%
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

16 of 20 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, 12x148mm thru-axle Not identified

Suspension

2 parts

Fork
- Giant
Rear shock

None

Drivetrain

7 parts

Bottom bracket
- Shimano
Cassette
- Shimano Deore CS-M4100 10 speeds
CS-M4100
Chain
- KMC X10 10 speeds
Crankset
- Shimano Deore 30t
Front derailleur

None
Rear derailleur
- Shimano Deore RD-M5120 11 speeds
RD-M5120M-5120
Shifters
- Shimano Deore SL-M4100 10 speeds
SL-M4100M-4100

Brakes

2 parts

Wheels and tires

5 parts

Front hub

alloy, sealed Not identified
Rear hub

alloy, sealed Not identified
Rims
- Giant
Spokes

stainless Not identified
Tires
- Maxxis Ardent Race

Cockpit and contact points

6 parts

Grips
- Giant
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 445mm

Stack 622mm

Wheelbase 1177mm

Head angle 66.0°

Seat angle 75.0°

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	425	445	470	490
Stackmm	622	622	631	640
Top tube lengthmm	592	612	639	662
Seat tube lengthmm	380	430	465	495
Head tube lengthmm	95	95	105	115
Head tube angle	66°	66°	66°	66°
Seat tube angle	75°	75°	75°	75°
Chainstay lengthmm	438	438	438	438
Wheelbasemm	1157	1177	1206	1230
Front centermm	726	746	774	798
Bottom bracket dropmm	60	60	60	60
Bottom bracket heightmm	295	295	295	295
Standover heightmm	708	727	746	772
Fork rakemm	44	44	44	44
Trailmm	113	113	113	113
Stack/reach ratio	1.46	1.40	1.34	1.31
Suspension and parts
Crank lengthmm	165	170	170	170
Handlebar widthmm	780	780	780	780
Stem lengthmm	40	40	50	50

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: 130 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 46
Lowest gear: 17.9 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

Bottom bracket standard: BSA
Fork spring: Air
Tire clearance: Maximum tire width: 2.6″
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

130 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2023
Sample: 2,195 bicycles with this information
Coverage: 97.5% of the class

Lowest gear

17.9 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2023
Sample: 1,627 bicycles with this information
Coverage: 72.2% of the class

Highest gear

75.0 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2023
Sample: 1,627 bicycles with this information
Coverage: 72.2% of the class

Shifting

Mechanical

359 of 2,251 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2023
Sample: 2,251 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.9 km/h
Highest gear: 28.7 km/h

Total gear range 418%

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: 17.9–75.0 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: 2023
Lowest gear: 1627 bicycles with this information, 72.2% of the class
Highest gear: 1627 bicycles with this information, 72.2% 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 2023 builds
Specification	This bicycle Giant Fathom 2	Giant Fathom 1	Giant Fathom 29 1	Giant Fathom 29 2
Drivetrain
Rear sprockets	10	12	12	10
Largest sprocket	46	50	50	46
Lowest gear	17.9 in	16.5 in	17.4 in	18.9 in
Highest gear	75.0 in	75.0 in	79.1 in	79.1 in
Other specifications
Tire clearance	Maximum tire width: 2.6″	Maximum tire width: 2.6″	Maximum tire width: 2.5″	Maximum tire width: 2.5″
Tire width	2.6″	2.6″	2.5″	2.5″
Wheel size	27.5″	27.5″	29″	29″