Sportbikes

2004Aprilia RS 125 Replica

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The 2004 Aprilia RS 125 Replica is an entry-level sportbike designed for novice and younger riders seeking affordable performance. Its lightweight single-cylinder engine and aggressive styling deliver thrilling acceleration and nimble handling, making it ideal for learning sport riding techniques. Best known for combining genuine race-replica aesthetics with practical 125cc reliability, it remains a popular choice for learner riders.

Capacity: 124.8 ccm
Engine: Single, two-stroke
Gearbox: 6-speed
Wet weight: 120.0 kg
Seat height: 805 mm
Power: 28.0 HP (21.0 kW) @ 10500 RPM

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Other years 2004 2005 2006 2007 2008 2009 2010 2017 2018

How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail5%

Cornering88%

City riding65%

Daily riding45%

Touring20%

Two-up15%

Track70%

Best for: It's built for learning sharp, precise cornering technique and having fun on twisty roads at accessible speeds rather than for outright straight-line performance.
Built for: It behaves like a miniature race replica, rewarding high revs and a light touch with sharp, eager handling despite modest power.
Not ideal for: It's not for taller riders, highway commuters, or anyone needing to carry a passenger or luggage over distance.

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 805mm, a rider of 68.9" with a 31" (estimated) inseam will reach the ground with both feet flat on the 2004 Aprilia RS 125 Replica, with a cramped knee angle of around 70 degrees and a forward-leaning 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: 28.0 HP (21.0 kW) @ 10500 RPM
Engine type: Single, two-stroke
Power/weight ratio: 0.2333 HP/kg (wet)
Bore x stroke: 54.0 x 54.5 mm
Compression: 12.5:1
Cooling system: Liquid
Fuel system: Carburettor
Starting: Electric
Ignition: Electronic with CDI capacity discharge
Lubrication system: Wet sump
Torque: Not on record - add it

Transmission

Gearbox: 6-speed
Transmission type: Manual
Final drive: Chain
Clutch: Multiple discs, in oil bath

Dimensions & weight

Wheelbase: 1345 mm
Overall length: 1950 mm
Overall width: 720 mm
Overall height: 1135 mm
Seat height: 805 mm
Wet weight: 120.0 kg
Fuel capacity: 14.00 litres
Reserve fuel capacity: 3.50 litres
Dry weight: Not on record - add it

Chassis & suspension

Frame: Cast aluminium sloping twin-spar
Front suspension: Upside-down hydraulic action telescopic fork
Rear suspension: Cast aluminium swing-arm
Front wheel travel: 120 mm
Rear wheel travel: 120 mm

Brakes & wheels

Front brakes: Single disc
Front brakes diameter: 320 mm
Rear brakes: Single disc
Rear brakes diameter: 220 mm
Front tyre: 110/70-ZR17
Rear tyre: 150/60-ZR17

Other

Color options: SBK Replica, GP-1 Replica
Comments: Listed power is the full-power version; a learner-restricted version rated 11 kW (15 hp) was also sold.

Specs last verified against published sources: October 2026.