Giant Fathom E+ 1 Pro

2020 MountainTrail Electric bicycle Manufacturer page

Giant Fathom E+ 1 Pro, color Metallic Red / Black

Fork travel: 120 mm
Wheels: 27.5″
Drivetrain: 1 × 12 38t / 11–50t
Gear range: 455%
Battery: 500 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 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 aluminum, Overdrive 1½ - 1⅛" head tube, 148x12mm Thru-Axle, integrated KS18 kickstand mount Not identified

Electric system

3 parts

Suspension

2 parts

Fork
- RockShox Recon RL
Rear shock

None

Drivetrain

7 parts

Bottom bracket

None
Cassette
- SRAM PG-1210 Eagle 12 speeds 11–50t
PG-1210
Chain
- SRAM SX Eagle 12 speeds
Crankset
- SRAM 38t
Front derailleur

None
Rear derailleur
- SRAM SX Eagle 12 speeds
Shifters
- SRAM SX Eagle Trigger 12 speeds

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

3 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 408mm

Stack 626mm

Wheelbase 1166mm

Head angle 68.0°

Seat angle 73.0°

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 3 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	386	408	430
Stackmm	617	626	635
Top tube lengthmm	575	600	625
Seat tube lengthmm	405	465	505
Head tube lengthmm	105	115	125
Head tube angle	68°	68°	68°
Seat tube angle	73°	73°	73°
Chainstay lengthmm	475	475	475
Wheelbasemm	1140	1166	1192
Front centermm	669	695	721
Bottom bracket dropmm	45	45	45
Bottom bracket heightmm	310	310	310
Standover heightmm	753	760	787
Fork rakemm	46	46	46
Trailmm	101.1	101.1	101.1
Stack/reach ratio	1.60	1.53	1.48
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: 120 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 38
Largest chainring: 38
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 50
Lowest gear: 20.9 in
Highest gear: 95.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Electric system

Battery capacity: 500 Wh

Additional specifications

Battery: Giant EnergyPak 500, 36V 13.8Ah integrated Lithium-Ion
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

20.9 gear inches

This value is above 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

95.0 gear inches

This value is above 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: 8.0 km/h
Highest gear: 36.4 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: 20.9–95.0 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

Differences across 2020 builds
Specification	This bicycle Giant Fathom E+ 1 Pro	Giant Fathom E+ 1 Pro 29	Giant Fathom E+ 1 Pro Electric Bike	Giant Fathom E+ 2 29	Giant Fathom E+ 2	Giant Fathom E+ 2 Pro 29
Frame
Bicycle weight	Not informed	23.4 kg	24.62 kg	22.7 kg	22.4 kg	Not informed
Drivetrain
Front chainrings	1	1	1	2	2	1
Smallest chainring	38	38	38	28	28	36
Largest chainring	38	38	38	38	38	36
Rear sprockets	12	12	12	10	10	10
Largest sprocket	50	50	50	42	42	42
Lowest gear	20.9 in	22.0 in	20.9 in	19.3 in	18.3 in	24.9 in
Highest gear	95.0 in	100.2 in	95.0 in	100.2 in	95.0 in	94.9 in
Other specifications
Battery	Capacity: 500 WhGiant EnergyPak 500, 36V 13.8Ah integrated Lithium-Ion	Capacity: 500 WhGiant EnergyPak 500, 36V 13.8Ah integrated Lithium-Ion	Capacity: 500 WhGiant EnergyPak 500, 36V 13.8Ah integrated Lithium-Ion	Capacity: 500 WhGiant EnergyPak 500, 36V 13.8Ah Rechargeable Lithium-Ion	Capacity: 500 WhGiant EnergyPak 500, 36V 13.8Ah Rechargeable Lithium-Ion	Capacity: 500 WhGiant EnergyPak 500, 36V 13.8Ah integrated Lithium-Ion
Tire width	2.6″	2.35″	2.6″	2.4″	2.6″	2.35″
Wheel size	27.5″	29″	27.5″	29″	27.5″	29″
Fork spring	Not informed	Not informed	Not informed	Coil	Coil	Air