Underbones

2018Keeway RCS 125

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The 2018 Keeway RCS 125 is a lightweight underbone for commuters who want frugal, practical step-through transport. Its 125cc air-cooled single makes 8.7 hp and 9.5 Nm, with a 785 mm seat, a 99 kg dry weight and a 3.9-litre tank.

Capacity: 124.8 ccm
Engine: Single, four-stroke
Gearbox: 4-speed
Dry weight: 99.0 kg
Seat height: 785 mm
Power: 8.7 HP (6.4 kW) @ 7000 RPM

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How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail5%

Cornering30%

City riding70%

Daily riding55%

Touring15%

Two-up20%

Track5%

Best for: Built for economical everyday transport, with step-through practicality and low running costs.
Built for: An underbone from Keeway 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 785mm, a rider of 68.9" with a 31" (estimated) inseam will reach the ground with both feet flat on the 2018 Keeway RCS 125, with a moderate knee angle of around 115 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: 124.8 ccm
Power: 8.7 HP (6.4 kW) @ 7000 RPM
Torque: 9.5 Nm (1.0 kgf-m) @ 5500 RPM
Engine type: Single, four-stroke
Power/weight ratio: 0.0879 HP/kg (dry)
Bore x stroke: 52.4 x 57.8 mm
Compression: 9.2:1
Cooling system: Air
Fuel system: Carburettor
Starting: Electric & kick
Ignition: CDI
Lubrication system: Pressure splash lubrication

Transmission

Gearbox: 4-speed
Transmission type: Manual
Final drive: Chain

Dimensions & weight

Wheelbase: 1258 mm
Overall length: 1834 mm
Overall width: 673 mm
Overall height: 1014 mm
Seat height: 785 mm
Dry weight: 99.0 kg
Fuel capacity: 3.90 litres

Chassis & suspension

Frame: Straddle type
Front suspension: Telescopic
Rear suspension: Dual shocks

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, black, green, grey
Comments: Sold in Asia.

Specs last verified against published sources: October 2026.

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

Rider Reviews

4.7

★★★★★

Rider rating

MotorcycleDB

The 2018 Keeway RCS 125 motorcycle is a stunning and versatile bike that offers a smooth and powerful ride. With its sleek design and sporty features, this bike is sure to turn heads on the road. The 125cc engine provides ample power for city commuting and weekend rides, while the comfortable seating and ergonomic handlebars make for an enjoyable riding experience. Whether you're a novice rider or a seasoned motorcyclist, the Keeway RCS 125 delivers a reliable and exciting performance that is sure to impress.

Overall, the 2018 Keeway RCS 125 motorcycle is a fantastic option for riders looking for a stylish and practical bike. Its impressive engine power and comfortable design make it a great choice for urban commuting and leisurely rides. With its modern features and attractive aesthetics, this bike offers a great balance of style and performance for riders of all levels. If you're in the market for a versatile and affordable motorcycle, the Keeway RCS 125 is definitely worth considering.

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