Superior eRX 6.4 MS

Name: Superior eRX 6.4 MS
Brand: Superior

2026 RoadTouring Electric bicycle Manufacturer page

Wheels: 650b
Drivetrain: 1 × 10 38t / 11–46t
Gear range: 418%
Battery: 630 Wh
Weight: 27.15 kg 59.9 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 158–170
MD 168–179
LG 176–187

Components

17 of 27 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

Alu 6061 T6, Advanced eCity Geometry, SHIMANO STEPS ready, Integrated battery, SR dropout, Inner cable routing Not identified

Electric system

4 parts

Suspension

1 part

Fork
- SR Suntour XCM32

Drivetrain

6 parts

Bottom bracket

STEPS, press-fit Not identified
Cassette
- Shimano Deore CS-M4100-10 10 speeds 11–46t
CS-M4100-10CS-M4100
Chain
- KMC
Crankset

ONE, Alloy Not identified
Rear derailleur
- Shimano Deore RD-M5120 11 speeds
RD-M5120
Shifters
- Shimano Deore SL-M4100-R 10 speeds
SL-M4100

Brakes

1 part

Brakes
- Shimano BR-MT200
BR-MT200

Wheels and tires

5 parts

Front hub
- Shimano HB-TX505
HB-TX505
Rear hub
- Shimano FH-TX505-8 11 speeds
FH-TX505
Rims

STARS J30D, Disc, 32H Not identified
Spokes
- Sapim
Tires

Rubena Cheetah, 27.5x2.35" Not identified

Cockpit and contact points

6 parts

Handlebar

ONE Alloy, 30mm rise, back sweep 15°, 31.8mm Not identified
Headset
- FSA
Pedals

Bearing Pedals with reflector, PP Body Not identified
Saddle
- Selle Royal
Seatpost

ONE, Alloy, 31.6mm Not identified
Stem

ONE, Alloy, 31,8mm, 35° Not identified

Other components

3 parts

Fenders

Alloy Not identified
Lights
- AXA
Racks
- Atran

Sizes and geometry

3 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 367mm

Stack 655mm

Wheelbase 1117mm

Head angle 69.0°

Seat angle 72.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 650b 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	357	367	394
Stackmm	655	655	664
Top tube lengthmm	570	580	610
Seat tube lengthmm	400	450	500
Head tube lengthmm	170	170	180
Head tube angle	69°	69°	69°
Seat tube angle	72°	72°	72°
Chainstay lengthmm	478	478	478
Wheelbasemm	1107	1117	1145
Front centermm	636	646	673
Bottom bracket dropmm	60	60	60
Fork rakemm	44	44	42
Trailmm	75	75	77
Stack/reach ratio	1.84	1.79	1.69
Suspension and parts
Crank lengthmm	170	170	170
Handlebar widthmm	660	660	660
Stem lengthmm	90	90	90

Not published by the manufacturer: Bottom bracket height, Standover height, Front travel, Rear travel, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Bicycle weight: 27.15 kg

59.9 lb

Suspension

Suspension configuration: Hardtail

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 38
Largest chainring: 38
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 46
Lowest gear: 22.7 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: 630 Wh

Additional specifications

Battery: SHIMANO, BT-EN806, 630Wh
Bottom bracket standard: Shimano STEPS
Fork spring: Coil
Tire width: 2.35″
Travel: Front: Additional specification: Not available: No
Wheel material: Aluminum
Wheel size: 650b

Gearing

Estimated speeds at 80 rpm

Lowest gear: 8.7 km/h
Highest gear: 36.4 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: 22.7–95.0 gear inches

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 2026 builds

Differences across 2026 builds
Specification	This bicycle Superior eRX 6.4 MS	Superior eRX 6.2	Superior eRX 6.2 LS	Superior eRX 6.2 MS	Superior eRX 6.3	Superior eRX 6.3 LS
Frame
Bicycle weight	27.15 kg	Not informed	24.9 kg	Not informed	27.35 kg	27.35 kg
Fork material	Not informed	Not informed	Carbon	Not informed	Not informed	Not informed
Drivetrain
Rear sprockets	10	9	9	9	8	8
Largest sprocket	46	36	36	36	45	45
Lowest gear	22.7 in	30.6 in	30.6 in	30.6 in	24.5 in	24.5 in
Highest gear	95.0 in	100.2 in	100.2 in	100.2 in	100.2 in	100.2 in
Cockpit
Seatpost	Rigid seatpost	Rigid seatpost	suspension	Rigid seatpost	suspension	suspension
Electric bicycle systems
Battery capacity	630 Wh	504 Wh	504 Wh	504 Wh	500 Wh	500 Wh
Other specifications
Bottom bracket standard	Shimano STEPS	Shimano STEPS	Shimano STEPS	Shimano STEPS	Not informed	Not informed
Tire width	2.35″	50c	1.75″	50c	2.1″	2.1″
Wheel size	650b	29″	29″	29″	29″	29″