Aprilia SX 125 - 2008 Specifications and Reviews

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.

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General information

CategoryCross / motocross
Year2008
ModelAprilia SX 125
 
 

Engine and Transmission Specifications

Transmission typefinal driveChain
Cooling systemLiquid
Lubrication systemMiscelazione separated with volumetric pump and variable capacity
StarterKick
IgnitionElectronics to capacitive discharge CDI
Fuel systemCarburettor. Dell carburetor and #146; Garden VHST 28
Compression12.5:1
Torque12.20
Stroke2
Engine typeSingle cylinder
Capacity:124.80 ccm (7.62 cubic inches)

Physical measures and capacities

Overall width850 mm (33.5 inches)
Overall length2,165 mm (85.2 inches)
Overall height1,390 mm (54.7 inches)
Seat height870 mm (34.3 inches) If adjustable, lowest setting.
Dry weight115.0 kg (253.5 pounds)

Aprilia SX 125 dimensions and frame

Rear brakes diameter220 mm (8.7 inches)
Rear brakesSingle disc. floating clamp to single pistoncino
Front brakes diameter260 mm (10.2 inches)
Front brakesSingle disc. floating clamp to double quantity pistoncino parallel
Rear tyre dimensions150/60-17
Front tyre dimensions110/70-17
Rear suspension travel270 mm (10.6 inches)
Rear suspensionOscillating Forcellone in steel, hydraulic monoshock-absorber with piggy-back, excursion rotates 270mm
Front suspension travel260 mm (10.2 inches)
Front suspensionTeleidraulica staple to steles turned upside down from 40mm, excursion rotates 260mm
Frame typeChassis in steel to high resistenziale with double beam to attice and double crib with reggisella decomposable

Speed and acceleration

Reserve fuel capacity1.30 litres (0.34 gallons)
Fuel capacity10.00 litres (2.64 gallons)

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay

Performance Profile & Rider Fit

14.8 hp
Peak Power

Best For

Track30%
City85%
Cornering80%
Daily Riding65%
Touring20%
Passenger25%

Rider Profile

Best ForThis bike suits new and younger riders, including those on a learner or A1-equivalent licence, who want a light, approachable machine to build confidence on.
PurposeIt'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.
Rider FitIts low weight and tall but slim seat make it easy to manage at a stop for shorter or less experienced riders, though the 880mm seat height requires reasonable inseam length.
CharacterPlayful, flickable, and eager to be thrown around corners, it rewards an energetic riding style over long-distance cruising.
Not Ideal ForIt's not the right choice for riders wanting highway speed, long motorway touring comfort, or serious off-road capability.

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

Rider Fit Visualizer

2008 Aprilia SX 125 Rider Ergonomics Assessment

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Feet:

At 870mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with tip-toe one foot on the 2008 Aprilia SX 125, with a cramped knee angle of around 75 degrees and an upright riding position.

Data quality: estimated (wheelbase estimated from this category's typical bike, not this model's own spec). 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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