Sportbikes

2005Aprilia RS 125

35 fields on record

The 2005 Aprilia RS 125 is a two-stroke race-replica sport bike, a favourite with learner riders. Its liquid-cooled 124.8cc single makes 28 hp at 10,500 rpm in full-power form through a six-speed gearbox and chain, and a learner-restricted version was also sold. An 805 mm seat, 143 kg wet weight and 14-litre tank complete it.

Capacity: 124.8 ccm
Engine: Single, two-stroke
Gearbox: 6-speed
Wet weight: 143.0 kg
Seat height: 805 mm
Power: 28.0 HP (21.0 kW) @ 10500 RPM

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Other years 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027

How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail3%

Cornering82%

City riding62%

Daily riding60%

Touring18%

Two-up18%

Track58%

Best for: A pint-sized track-styled sportbike built for spirited backroad riding, carving corners, commuting, and learning proper sport riding skills.
Built for: A miniature superbike with real GP-inspired attitude - eager, revvy single that must be worked hard, delivering big-bike thrills at modest speeds.
Not ideal for: Not for those wanting outright speed, relaxed touring comfort, two-up practicality, off-road use, or a laid-back upright commuter.

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

Will it fit you?

Worked out in your browser - nothing is sent to us

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 2005 Aprilia RS 125, 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: 0.1958 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: CDI capacitor discharge electronic
Lubrication system: Separate mixing with variable displacement volumetric pump
Torque: Not on record - add it

Transmission

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

Performance

Top speed: 120.0 km/h (74.6 mph)

Dimensions & weight

Wheelbase: 1345 mm
Overall length: 2015 mm
Overall height: 1095 mm
Seat height: 805 mm
Wet weight: 143.0 kg
Fuel capacity: 14.00 litres
Dry weight: Not on record - add it

Chassis & suspension

Frame: Cast aluminium, reinforced box section, sloping twin-spar frame.
Front suspension: Upside-down hydraulic action telescopic fork, 40 mm inners.
Rear suspension: Cast aluminium swing-arm with asymmetrical members, thin walled structural shell, single hydraulic monoshock, adjustable spring preload.
Front wheel travel: 120 mm
Rear wheel travel: 120 mm

Brakes & wheels

Front brakes: Double disc
Front brakes diameter: 320 mm
Rear brakes: Single disc
Rear brakes diameter: 220 mm
Front tyre: 110/70-17
Rear tyre: 110/70-17

Other

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.

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

What changed, year to year

Differences highlighted

Specification	1997	2004	2005	2011	2020	2027
Capacity	125 cc	125 cc	125 cc	125 cc	125 cc	124 cc
Dry weight	117 kg	—	—	—	122 kg	—
Seat height	780 mm	805 mm	805 mm	805 mm	820 mm	820 mm
Fuel capacity	13 L	14 L	14 L	14 L	14.5 L	14.5 L