Opus E-BIG City ST

Name: Opus E-BIG City ST
Brand: Opus

2025 UrbanCommuter Electric bicycle Manufacturer page

Suspension: Rigid
Wheels: 650b
Drivetrain: 1 × 9 38t / 11–36t
Gear range: 327%
Battery: 418 Wh
Weight: 19.8 kg 43.7 lb · Reference configuration not specified
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 158–170
MD 168–179
LG 176–187

Components

18 of 22 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

Step-thru frame for everyone to enjoy Not identified

Electric system

3 parts

Battery
- Shimano Steps BT-E8014
BT-E8014E-8014
Display
- Shimano SC-E5000
SC-E5000
Motor
- Shimano DU-E5000 1 speed
DU-E5000E-5000

Suspension

1 part

Fork

Aluminum tapered 1-1/2 to 1-1/8 in Not identified

Drivetrain

7 parts

Bottom bracket

None
Cassette
- Shimano
Chain
- KMC
Crankset
- Shimano FC-E5000
FC-E5000
Front derailleur

None
Rear derailleur
- Shimano Cues RD-U3020 9 speeds
RD-U3020
Shifters
- Shimano Cues SL-U4000
SL-U4000

Brakes

2 parts

Brake levers
- Shimano BL-MT201
BL-MT201
Brakes
- Shimano
BR-MT201

Wheels and tires

4 parts

Front hub
- Formula
Rear hub
- Formula
Rims

Weinnman U32 TL Not identified
Tires
- Kenda Kwick

Cockpit and contact points

6 parts

Handlebar
- ProMax
Headset
- FSA ORBIT IS 138
Pedals

FPD NW-247 Not identified

NW-247
Saddle
- Opus
Seatpost
- ProMax
Stem
- ProMax

Sizes and geometry

3 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Geometry diagram unavailable

The drawing needs wheelbase, which the manufacturer did not publish. Available facts remain in the table.

Size Reported by the manufacturer

Complete manufacturer geometry table 3 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	380	405	428
Stackmm	578	598	623
Top tube lengthmm	540	582	619
Seat tube lengthmm	430	470	510
Head tube lengthmm	155	180	200
Head tube angle	71°	71°	71.5°
Seat tube angle	74°	73.5°	73°
Chainstay lengthmm	460	460	460
Bottom bracket dropmm	65	60	60
Stack/reach ratio	1.52	1.48	1.46
Suspension and parts
Crank lengthmm	170	170	170
Handlebar widthmm	620	620	620
Stem lengthmm	70	70	80

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

Specifications

Frame and fork

Intended fit: Unisex
Fork material: Aluminum
Bicycle weight: 19.8 kg

43.7 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 38
Largest chainring: 38
Rear sprockets: 9
Smallest sprocket: 11
Largest sprocket: 36
Lowest gear: 29.0 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: 418 Wh

Additional specifications

Battery: Shimano E-8014 418Wh 36V 11.6Ah battery
Tire width: 2.4″
Wheel material: Aluminum
Wheel size: 650b

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: 29.0–95.0 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 2025 builds
Specification	This bicycle Opus E-BIG City ST	Opus E-BIG City	Opus E-BIG City LRT	Opus E-BIG City LRT ST
Frame
Bicycle weight	19.8 kg	19.8 kg	20.2 kg	20.2 kg
Frame material	Not informed	Aluminum	Aluminum	Not informed
Drivetrain
Rear sprockets	9	9	Not informed	Not informed
Largest sprocket	36	36	39	39
Lowest gear	29.0 in	29.0 in	26.8 in	26.8 in
Other specifications
Battery	Capacity: 418 WhShimano E-8014 418Wh 36V 11.6Ah battery	Capacity: 418 WhShimano E-8014 418Wh 36V 11.6Ah battery	Capacity: 418 WhShimano EN-604 418Wh 36V 11.6Ah battery	Capacity: 418 WhShimano EN-604 418Wh 36V 11.6Ah battery