Giant Fathom E+ 29 3 Electric Bike

2021 MountainTrail Electric bicycle Manufacturer page

Giant Fathom E+ 29 3 Electric Bike, color Gloss Eclipse

Price: Not published

Prices shown first for United States
United Kingdom: £2,299 Last known price
Fork travel: 120 mm
Wheels: 29″
Drivetrain: 1 × 9 36t / 11–36t
Gear range: 327%
Battery: 400 Wh
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 158–171
MD 168–180
LG 178–189
XL 186–199

Components

19 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 aluminum, Overdrive 1½ - 1⅛" head tube, 141mm Boost QR, integrated KS18 kickstand mount Not identified

Electric system

3 parts

Battery
- Giant
Display

Wireless display compatible Not identified
Motor
- Giant

Suspension

3 parts

Drivetrain

7 parts

Bottom bracket

None
Cassette
- Shimano CS-HG200 11–36t
CS-HG200
Chain
- KMC e9 Sport 9 speeds
Crankset
- Factor 36t
Front derailleur

None
Rear derailleur
- Shimano Alivio RD-M3100 9 speeds
RD-M3100
Shifters
- Shimano Altus

Brakes

2 parts

Brake levers
- Tektro
HD-M285
Brakes
- Tektro
HD-M285

Wheels and tires

5 parts

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

Stainless steel Not identified
Tires
- Maxxis

Cockpit and contact points

5 parts

Handlebar
- Giant
Pedals

Aluminum Platform Not identified
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 405mm

Stack 622mm

Wheelbase 1161mm

Head angle 68.0°

Seat angle 73.0°

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 4 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	386	405	417	435
Stackmm	617	622	645	654
Top tube lengthmm	575	595	615	635
Seat tube lengthmm	405	455	505	535
Head tube lengthmm	110	115	140	150
Head tube angle	68°	68°	68°	68°
Seat tube angle	73°	73°	73°	73°
Chainstay lengthmm	470	470	470	470
Wheelbasemm	1140	1161	1183	1204
Front centermm	674	695	717	738
Bottom bracket dropmm	45	45	45	45
Bottom bracket heightmm	329	329	329	329
Standover heightmm	753	760	787	791
Fork rakemm	51	51	51	51
Trailmm	95.3	95.3	95.3	95.3
Stack/reach ratio	1.60	1.54	1.55	1.50
Suspension and parts
Crank lengthmm	165	170	170	170
Handlebar widthmm	780	780	780	780
Stem lengthmm	50	60	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

Suspension

Suspension configuration: Hardtail
Front travel: 120 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 36
Largest chainring: 36
Rear sprockets: 9
Smallest sprocket: 11
Largest sprocket: 36
Lowest gear: 29.0 in
Highest gear: 94.9 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Electric system

Battery capacity: 400 Wh

Additional specifications

Battery: Giant EnergyPak 400Wh
Fork spring: Coil
Tire width: 2.4″
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

120 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,324 bicycles with this information
Coverage: 98.1% of the class

Lowest gear

29.0 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,137 bicycles with this information
Coverage: 84.2% of the class

Highest gear

94.9 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,137 bicycles with this information
Coverage: 84.2% of the class

Shifting

Mechanical

53 of 1,346 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,346 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 11.1 km/h
Highest gear: 36.4 km/h

Total gear range 327%

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: 29.0–94.9 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: 1137 bicycles with this information, 84.2% of the class
Highest gear: 1137 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+ 29 3 Electric Bike	Giant Fathom E+ 29 2	Giant Fathom E+ 29 2 Electric Bike	Giant Fathom E+ 29 3	Giant Fathom E+ 3	Giant Fathom E+ 3 Electric Bike
Frame
Bicycle weight	Not informed	19.5 kg	19.5 kg	Not informed	Not informed	Not informed
Drivetrain
Rear sprockets	9	10	10	9	9	9
Largest sprocket	36	46	46	36	36	36
Lowest gear	29.0 in	22.7 in	22.7 in	29.0 in	27.5 in	27.5 in
Highest gear	94.9 in	94.9 in	94.9 in	94.9 in	90.0 in	90.0 in
Electric bicycle systems
Battery capacity	400 Wh	500 Wh	500 Wh	400 Wh	400 Wh	400 Wh
Other specifications
Tire width	2.4″	2.4″	2.4″	2.4″	2.6″	2.6″
Wheel size	29″	29″	29″	29″	27.5″	27.5″