Underbones

2021UM Flash 125

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The 2021 UM Flash 125 is an affordable underbone for commuters who want frugal, practical step-through transport. Its 125cc air-cooled single makes 8.8 hp and 9 Nm, with a 770 mm seat.

Capacity: 125.0 ccm
Engine: Single, four-stroke
Gearbox: Not on record
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Dry weight: Not on record
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Seat height: 770 mm
Power: 8.8 HP (6.5 kW) @ 7700 RPM

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How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail10%

Cornering30%

City riding80%

Daily riding70%

Touring15%

Two-up30%

Track5%

Best for: Built for economical everyday transport, with step-through practicality and low running costs.
Built for: An underbone from UM with a 125cc engine; its character is easy-going and economical, with 9 hp on tap.
Not ideal for: Not for motorway speeds, long trips or off-road riding.

Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.

Will it fit you?

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Your height

Inseam (optional)

Units

At 770mm, a rider of 68.9" with a 31" (estimated) inseam will reach the ground with both feet flat on the 2021 UM Flash 125, with a moderate knee angle of around 110 degrees and a slightly forward riding position.

Assumes about 30mm of suspension sag once seated. This is an approximation from category-typical geometry, not a measurement of this bike or of you - sit on one before you buy.

More bikes at 751-820 mm — Middle Ground →

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Full specifications

Engine

Capacity: 125.0 ccm
Power: 8.8 HP (6.5 kW) @ 7700 RPM
Torque: 9.0 Nm (0.9 kgf-m) @ 6000 RPM
Engine type: Single, four-stroke
Bore x stroke: 54.0 x 54.0 mm
Compression: 9.0:1
Cooling system: Air
Starting: Electric & kick
Ignition: CDI

Transmission

Transmission type: Automatic

Dimensions & weight

Wheelbase: 1250 mm
Overall length: 2015 mm
Overall width: 710 mm
Overall height: 1005 mm
Seat height: 770 mm
Dry weight: Not on record - add it
Fuel capacity: Not on record - add it

Chassis & suspension

Front suspension: Telescopic fork
Rear suspension: Monoshock

Brakes & wheels

Front brakes: Single disc
Rear brakes: Expanding brake (drum brake)
Front tyre: 70/90-17
Rear tyre: 80/90-17

Other

Color options: Red, Blue, Orange, Silver

Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.

Rider Reviews

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MotorcycleDB

The 2021 UM Flash 125 is a sleek and stylish motorcycle that offers great performance for its class. With a 125cc engine, this bike is perfect for urban commuting and daily riding. The handling is responsive and the bike feels stable at high speeds. The design is modern and eye-catching, making it stand out on the road. The price point is also very attractive for riders on a budget. Overall, the UM Flash 125 is a solid choice for anyone looking for a reliable and affordable motorcycle.

If you're in the market for a new motorcycle, the 2021 UM Flash 125 is definitely worth considering. Its impressive performance, stylish design, and budget-friendly price make it a great option for urban commuters and daily riders. With its 125cc engine, this bike offers a good balance of power and efficiency, making it a practical choice for city streets. Plus, its modern design will surely turn heads wherever you go.Overall, the UM Flash 125 is a great value for riders looking for a reliable and affordable motorcycle.

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