Giant Fathom E+ Pro 29 1

2021 MountainTrail Electric bicycle Manufacturer page

Giant Fathom E+ Pro 29 1, color Dusty Blue / Black

Fork travel: 130 mm
Wheels: 29″
Drivetrain: 1 × 12 36t / 10–51t
Gear range: 510%
Battery: 625 Wh
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 163–173
MD 170–181
LG 178–188

Components

20 of 23 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 aluminum, Overdrive 1½ - 1⅛" head tube, 148x12mm Thru-Axle, integrated KS18 kickstand mount Not identified

Electric system

3 parts

Battery
- Giant
Display

Wireless display compatible (ANT+ and Bluetooth) Not identified
Motor
- Giant

Suspension

3 parts

Drivetrain

7 parts

Bottom bracket

None
Cassette
- Shimano Deore CS-M6100-12 12 speeds 10–51t
CS-M6100-12HG-M6100
Chain
- KMC e12 12 speeds
Crankset
- Praxis 36t
Front derailleur

None
Rear derailleur
- Shimano SLX RD-M7100 12 speeds
RD-M7100
Shifters
- Shimano Deore SL-M6100 12 speeds
SL-M6100

Brakes

2 parts

Brake levers
- Shimano BL-MT401
BL-MT401
Brakes
- Shimano BR-MT420
BR-MT420

Wheels and tires

5 parts

Cockpit and contact points

5 parts

Handlebar
- Giant
Pedals

Aluminum Platform Not identified
Saddle
- Giant
Seatpost
- Giant
Stem
- Giant

Sizes and geometry

3 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 444mm

Stack 625mm

Wheelbase 1231mm

Head angle 66.0°

Seat angle 76.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 29″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 3 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	421	444	467
Stackmm	616	625	635
Top tube lengthmm	575	600	625
Seat tube lengthmm	405	455	505
Head tube lengthmm	105	115	125
Head tube angle	66°	66°	66°
Seat tube angle	76°	76°	76°
Chainstay lengthmm	475	475	475
Wheelbasemm	1204	1231	1258
Front centermm	733	759	786
Bottom bracket dropmm	45	45	45
Bottom bracket heightmm	329	329	329
Standover heightmm	758	762	794
Fork rakemm	51	51	51
Trailmm	108.5	108.5	108.5
Stack/reach ratio	1.46	1.41	1.36
Suspension and parts
Crank lengthmm	165	170	170
Handlebar widthmm	780	780	780
Stem lengthmm	50	60	60

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: 36
Largest chainring: 36
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 51
Lowest gear: 20.5 in
Highest gear: 104.4 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Dropper seatpost
Shifting: Mechanical

Electric system

Battery capacity: 625 Wh

Additional specifications

Battery: Giant EnergyPak Smart 625, 36V 13.8Ah integrated Lithium-Ion
Fork spring: Air
Tire width: 2.5″
Wheel material: Aluminum
Wheel size: 29″

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: 2021
Sample: 1,325 bicycles with this information
Coverage: 98.1% of the class

Lowest gear

20.5 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,138 bicycles with this information
Coverage: 84.2% of the class

Highest gear

104.4 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,138 bicycles with this information
Coverage: 84.2% of the class

Shifting

Mechanical

53 of 1,347 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,347 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.8 km/h
Highest gear: 40.0 km/h

Total gear range 510%

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: 20.5–104.4 gear inches
Class reference (p10–p90): 16.9–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2021
Lowest gear: 1138 bicycles with this information, 84.2% of the class
Highest gear: 1138 bicycles with this information, 84.2% 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 2021 builds

Differences across 2021 builds
Specification	This bicycle Giant Fathom E+ Pro 29 1	Giant Fathom E+ 29 2	Giant Fathom E+ 29 2 Electric Bike	Giant Fathom E+ 29 3	Giant Fathom E+ 29 3 Electric Bike	Giant Fathom E+ 3
Frame
Bicycle weight	Not informed	19.5 kg	19.5 kg	Not informed	Not informed	Not informed
Suspension
Front travel	130 mm	120 mm	120 mm	120 mm	120 mm	120 mm
Drivetrain
Rear sprockets	12	10	10	9	9	9
Smallest sprocket	10	11	11	11	11	11
Largest sprocket	51	46	46	36	36	36
Lowest gear	20.5 in	22.7 in	22.7 in	29.0 in	29.0 in	27.5 in
Highest gear	104.4 in	94.9 in	94.9 in	94.9 in	94.9 in	90.0 in
Cockpit
Seatpost	Dropper seatpost	Rigid seatpost	Rigid seatpost	Rigid seatpost	Rigid seatpost	Rigid seatpost
Electric bicycle systems
Battery capacity	625 Wh	500 Wh	500 Wh	400 Wh	400 Wh	400 Wh
Other specifications
Fork spring	Air	Coil	Coil	Coil	Coil	Coil
Tire width	2.5″	2.4″	2.4″	2.4″	2.4″	2.6″
Wheel size	29″	29″	29″	29″	29″	27.5″