Enduro Bikes

2005Aprilia RX 125

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The 2005 Aprilia RX 125 is a two-stroke enduro bike for learner riders. Its liquid-cooled 124.8cc single makes 15 hp through a six-speed gearbox and chain. A tall 925 mm seat, 105 kg wet weight and 12-litre tank suit trails and town.

Capacity: 124.8 ccm
Engine: Single, two-stroke
Gearbox: 6-speed
Dry weight: 91.0 kg
Seat height: 925 mm
Power: 15.0 HP (11.0 kW)

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Other years 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2025 2026

How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail88%

Cornering55%

City riding45%

Daily riding40%

Touring20%

Two-up15%

Track10%

Best for: Designed primarily for light trail riding, green-laning, and off-road learning rather than speed or distance.
Built for: A nimble, playful small-capacity enduro that rewards momentum and finesse over outright power.
Not ideal for: Not suited for riders wanting high-speed touring, motorway cruising, or carrying a passenger in comfort.

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 925mm, a rider of 175cm with a 79cm (estimated) inseam will not reach the ground comfortably on the 2005 Aprilia RX 125, with a cramped knee angle of around 80 degrees and an upright 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 over 900 mm — Sky High →

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Full specifications

Engine

Capacity: 124.8 ccm
Power: 15.0 HP (11.0 kW)
Engine type: Single, two-stroke
Power/weight ratio: 0.1648 HP/kg (dry)
Bore x stroke: 54.0 x 54.5 mm
Compression: 12.5:1
Cooling system: Liquid
Fuel system: Carburettor
Starting: Kick
Ignition: Electronics to capacitive discharge CDI
Lubrication system: Miscelazione separated with volumetric pump and variable capacity
Torque: Not on record - add it

Transmission

Gearbox: 6-speed
Transmission type: Manual
Final drive: Chain
Clutch: Multi-plate wet clutch.

Dimensions & weight

Wheelbase: 1465 mm
Overall length: 2165 mm
Overall width: 850 mm
Overall height: 1195 mm
Seat height: 925 mm
Dry weight: 91.0 kg
Wet weight: 105.0 kg
Fuel capacity: 12.00 litres
Reserve fuel capacity: 2.50 litres
Ground clearance: Not on record - add it

Chassis & suspension

Frame: Chassis in steel to high resistenziale with double beam to attice and double crib with reggisella decomposable
Front suspension: Teleidraulica staple to steles turned upside down from 40mm, excursion rotates 260mm
Rear suspension: Oscillating Forcellone in steel, hydraulic monoshock-absorber with piggy-back, excursion rotates 270mm
Front wheel travel: 267 mm
Rear wheel travel: 390 mm

Brakes & wheels

Front brakes: Single disc
Front brakes diameter: 250 mm
Rear brakes: Single disc
Rear brakes diameter: 220 mm
Front tyre: 90/90-21
Rear tyre: 120/80-19

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	1984	1994	2005	2015	2026
Capacity	124 cc	124 cc	125 cc	124 cc	124 cc
Dry weight	91 kg	91 kg	91 kg	116 kg	124 kg
Seat height	925 mm	925 mm	925 mm	830 mm	905 mm
Fuel capacity	8.5 L	8.5 L	12 L	10 L	7 L