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2025 Opus

BIG CITY

A 650b aluminum frame commuter bike with modest components and shimano hydraulic disc brakes.
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Manufacturer Price

CA$899($651)
Weight26.2 lbs  
FrameAluminum
SuspensionRigid
ForkAluminum
Wheels650b Aluminum
Drivetrain3 × 9
GroupsetAltus
BrakesShimano Hydraulic Disc
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Insights
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

33 mph

BIG CITY

31 mph

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Highest gear

(descending)

Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

Compare the full BIG CITY model range

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Sizing
XS

5'1" – 5'6"

SM

5'4" – 5'9"

MD

5'7" – 6'0"

LG

5'10" – 6'3"

XL

6'0" – 6'5"

🐐 Estimated

Rider Fit Notes

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Geometry
Specs
Build
Frame

Alloy frame and fork

ColorSilver

Fork

Aluminum tapered 1-1/4 to 1-1/8 in

Bottom Bracket

Shimano sealed cartridge

Headset

FSA Orbit integrated sealed

Stem

Promax

Handlebar

Alloy butted 12 mm rise

Saddle

Opus City

Seatpost

Promax alloy 27.2 x 300

TypeRigid

Pedals

FPD NW-247

Groupset
Rear Derailleur

Shimano Altus

Front Derailleur

Shimano Altus

Crank

Shimano FC-MT101

Shifters

Shimano ST-EF505 3 x 9

Cassette

Shimano 11-28t

Chain

KMC-Z9

Brakes

Shimano BR-MT200 hydraulic disc

TypeShimano Hydraulic Disc

Brake Levers

Shimano

Wheels
Rims

Weinmann U28 650

Front Hub

Joytech

Rear Hub

Joytech

Tires

Kenda Kwick Seven.5 650 x 45

Rider Notes
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First added May 3

Last updated October 4

Not listed for 237 days