Aprilia RS 125 - 2021 Specifications and Reviews

The 2021 Aprilia RS 125 is a lightweight sport bike designed for new riders and commuters seeking an accessible entry into sportbike riding. Powered by a 124cc liquid-cooled four-stroke engine producing 28.2 horsepower, it delivers responsive performance and agile handling in a manageable package. Best known for its sharp styling, reliable mechanics, and excellent fuel efficiency, the RS 125 combines everyday practicality with genuine sporting character.

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General information

CategorySport
Year2021
ModelAprilia RS 125
 
 

Engine and Transmission Specifications

Emission detailsEuro 4
DrivelinePrimary drive: Gearbox: 63/19 (3.31). Final drive: Chain: 17/40 (2.35).
ClutchMultiple discs, in oil bath
Transmission typeChain   (final drive)
Gearbox6-speed
Cooling systemLiquid
Lubrication systemWet sump
IgnitionElectronic with CDI capacity discharge
Fuel controlDouble Overhead Cams/Twin Cam (DOHC)
Fuel systemCarburettor. Magneti Marelli M3G ø 32mm ECU
Valves per Cylinder4
Bore x Stroke58.0 x 47.0 mm (2.3 x 1.9 inches)
Compression12.5:1
Power28.2 HP (20.6 kW)
Engine typeSingle cylinder, four-stroke
Capacity:124.2 ccm (7.58 cubic inches)

Brakes, suspension, Frame and wheels

WheelsAluminium alloy rims
Rear brakesSingle disc. Stainless steel disc and calliper with single 30 mm piston.
Diameter300 mm (11.8 inches)
Front brakesSingle disc. ABS. Stainless steel disc with radial 4 piston calliper
Rear tire130/70-R17
Front tire100/80-R17
Rear wheel travel120 mm (4.7 inches)
Rear SuspensionSwingarm. Hydraulic monoshock with adjustable spring preload.
Front wheel travel110 mm (4.3 inches)
Front SuspensionUpside down hydraulic fork, 41 mm.
Frame typeAluminium perimeter
 
 

Physical measures and capacities

Reserve fuel capacity3.50 litres (0.92 US gallons)
Fuel capacity14.50 litres (3.83 US gallons)
Wheelbase1353 mm (53.3 inches)
Overall width760 mm (29.9 inches)
Overall length1968 mm (77.5 inches)
Overall height1135 mm (44.7 inches)
Seat height820 mm (32.3 inches) If adjustable, lowest setting.

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay
StarterElectric
Color optionsBlack Speed, Silver Spped

Performance Profile & Rider Fit

14.8 hp
Peak Power
9.5s
0-60 mph

Best For

Track58%
City62%
Cornering82%
Daily Riding60%
Touring18%
Passenger18%

Rider Profile

Best ForIdeal for beginners and A1 licence holders; a forgiving, learner-friendly sportbike that also rewards experienced riders honing technique.
PurposeA pint-sized track-styled sportbike built for spirited backroad riding, carving corners, commuting, and learning proper sport riding skills.
Rider FitLight 144kg with a committed sport riding position: clip-on bars, 820mm seat and rear-set pegs. Compact and manageable but leaning-forward and firm.
CharacterA miniature superbike with real GP-inspired attitude - eager, revvy single that must be worked hard, delivering big-bike thrills at modest speeds.
Not Ideal ForNot for those wanting outright speed, relaxed touring comfort, two-up practicality, off-road use, or a laid-back upright commuter.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2021 Aprilia RS 125 Rider Ergonomics Assessment

Calculated in your browser only - your height/inseam are never sent to our servers.

Feet:

At 820mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with balls of both feet on the 2021 Aprilia RS 125, with a cramped knee angle of around 70 degrees and a forward-leaning riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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Rider Reviews

Total comments: 1
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MotorcycleDB Review

The 2021 Aprilia RS 125 is a sleek and powerful motorcycle that is sure to turn heads on the road. With its aggressive styling and high-performance engine, this bike is perfect for riders who crave speed and agility. The 125cc engine delivers impressive power, while the lightweight chassis and advanced suspension offer excellent handling and control. Whether you're navigating city streets or hitting the open road, the Aprilia RS 125 provides an exhilarating riding experience that is unmatched in its class. In addition to its impressive performance, the 2021 Aprilia RS 125 also boasts advanced technology features such as LED lighting, digital display, and a range of safety systems. These modern amenities enhance the overall riding experience and provide added convenience for the rider. With its combination of sporty design, powerful engine, and cutting-edge technology, the Aprilia RS 125 is a top choice for riders looking for a thrilling and dynamic motorcycle.
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