2008Aprilia SX 125

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The 2008 Aprilia SX 125 is a lightweight motocross bike designed for young riders and beginners entering competitive off-road racing. Its 124cc single-cylinder engine delivers accessible power while the liquid-cooled design ensures reliable performance during training and amateur competition. Known for its nimble handling and affordability, the SX 125 remains a popular entry-level choice for aspiring motocross racers.

Capacity: 124.8 ccm
Engine: Single, two-stroke
Gearbox: 6-speed
Dry weight: 115.0 kg
Seat height: 870 mm
Power: 15.0 HP (11.0 kW)

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How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail35%

Cornering80%

City riding85%

Daily riding65%

Touring20%

Two-up25%

Track30%

Best for: It's built as a nimble supermoto-styled commuter for weaving through city traffic and having fun on twisty back roads rather than for outright speed.
Built for: Playful, flickable, and eager to be thrown around corners, it rewards an energetic riding style over long-distance cruising.
Not ideal for: It's not the right choice for riders wanting highway speed, long motorway touring comfort, or serious off-road capability.

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 870mm, a rider of 68.9" with a 31" (estimated) inseam will reach the ground with tip-toe one foot on the 2008 Aprilia SX 125, with a relaxed knee angle of around 140 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.

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Full specifications

Engine

Capacity: 124.8 ccm
Power: 15.0 HP (11.0 kW)
Torque: 12.2 Nm (1.2 kgf-m)
Engine type: Single, two-stroke
Power/weight ratio: 0.1304 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

Transmission

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

Dimensions & weight

Wheelbase: 1480 mm
Overall length: 2165 mm
Overall width: 850 mm
Overall height: 1390 mm
Seat height: 870 mm
Dry weight: 115.0 kg
Wet weight: 120.0 kg
Fuel capacity: 10.00 litres
Reserve fuel capacity: 1.30 litres

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: 260 mm
Rear wheel travel: 270 mm

Brakes & wheels

Front brakes: Single disc. floating clamp to double quantity pistoncino parallel
Front brakes diameter: 260 mm
Rear brakes: Single disc. floating clamp to single pistoncino
Rear brakes diameter: 220 mm
Front tyre: 110/70-17
Rear tyre: 150/60-17

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	2008	2013	2017	2022	2026
Capacity	125 cc	122 cc	122 cc	125 cc	124 cc
Dry weight	115 kg	115 kg	115 kg	115 kg	115 kg
Seat height	870 mm	830 mm	830 mm	880 mm	880 mm
Fuel capacity	10 L	10 L	10 L	7 L	7 L