Supermotos

2015Aprilia SX 125

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The 2015 Aprilia SX 125 is a 125cc supermoto from Aprilia, aimed at learner riders. Its liquid-cooled 122cc single drives through a six-speed gearbox and chain, for a top speed of about 120 km/h. An 830 mm seat, 120 kg wet weight and 10-litre tank give it big-bike looks.

Capacity: 122.0 ccm
Engine: Single, two-stroke
Gearbox: 6-speed
Dry weight: 115.0 kg
Seat height: 830 mm
Power: 21.5 HP (15.8 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 830mm, a rider of 68.9" with a 31" (estimated) inseam will reach the ground with balls of both feet on the 2015 Aprilia SX 125, with a relaxed knee angle of around 130 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 821-900 mm — Long Legs →

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Full specifications

Engine

Capacity: 122.0 ccm
Power: 21.5 HP (15.8 kW)
CO2 Emissions: 3 CO2 g/km
Torque: 16.0 Nm (1.6 kgf-m) @ 9750 RPM
Engine type: Single, two-stroke
Power/weight ratio: 0.1870 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: Electronic CDI ignition.
Lubrication system: Separate mixing with variable displacement, volumetric pump.

Transmission

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

Performance

Top speed: 120.0 km/h (74.6 mph)

Dimensions & weight

Wheelbase: 1480 mm
Overall length: 2165 mm
Overall width: 850 mm
Seat height: 830 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: High strength steel frame with double trellis beam and double cradle. Detachable seat frame.
Front suspension: 40 mm upside down hydraulic fork.
Rear suspension: Steel swingarm. Hydraulic monoshock with piggy back cylinder.
Front wheel travel: 260 mm
Rear wheel travel: 270 mm

Brakes & wheels

Front brakes: Single disc. Floating caliper with two parallel pistons.
Front brakes diameter: 260 mm
Rear brakes: Single disc. Floating caliper with single piston.
Rear brakes diameter: 220 mm
Front tyre: 110/70-17
Rear tyre: 150/60-17

Other

Color options: Black

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	2015	2017	2022	2026
Capacity	125 cc	122 cc	122 cc	122 cc	125 cc	124 cc
Dry weight	115 kg	115 kg	115 kg	115 kg	115 kg	115 kg
Seat height	870 mm	830 mm	830 mm	830 mm	880 mm	880 mm
Fuel capacity	10 L	10 L	10 L	10 L	7 L	7 L