Aprilia RS 125 Buyer's Guide

The Machine's Character

The RS 125 is a small-displacement sportbike built with a big-bike mindset. Its styling comes straight from Aprilia's RSV4, and the hardware matches the look: an aluminum twin-spar frame, a 1.6 in (40 mm) upside-down fork and a radial front brake on an 11.8 in (300 mm) disc. Power comes from a 124 cc liquid-cooled single making 15 hp at 10,500 rpm, so you work for every bit of speed. ABS comes standard, which means the electronics are part of the design and not an afterthought. Fit and finish feel properly premium for a bike this size.

At 317 lb (144 kg) wet, it rides like what it is. The chassis is light and eager and wants corner speed rather than straight-line punch. It stays composed on rough pavement and has plenty of lean clearance, which makes it an honest teacher of lines, braking points and momentum. This is the bike for a rider who wants to get good in the twisties and doesn't care about bragging rights. The caveat is plain. With a 71 mph (115 km/h) top speed, interstate stretches are off the table. The gearbox can get sticky when it's cold, and the battery can drain without warning.

Hard Numbers

Spec sheets don't ride bikes, but they set the baseline.

Show full specs & equipment Hide specs & equipment

Key specifications
Power	15 hp (11 kW) @ 10,500 rpm
Torque	8 lb-ft (11 Nm) @ 8,500 rpm
Displacement	124 cc
Engine	Single-cylinder
Cooling	Liquid-cooled
Gearbox	6-speed
Final drive	Chain
Fork	Upside-down (USD)
Front brake	300 mm
Front tire	100/80-17
Rear tire	130/70-17
Wheelbase	53.1 in (1350 mm)
Seat height	32.3 in (820 mm)
Wet weight	317 lb (144 kg)
Fuel capacity	3.8 gal (14.5 L)
Top speed	71 mph (115 km/h)
Fuel economy	84 mpg (US)

Equipment check

Chassis

Rear Suspension Adjustable Standard

Connectivity

Smartphone Connectivity Optional

Lighting

LED Headlight Standard

Safety

ABS Standard

Known issues

Gearbox shifting problems

drivetrain occasional

Some owners report sticky or difficult gear changes, particularly when cold or during aggressive riding. Shifts can feel vague or require excessive effort.
Battery drain and starting issues

electrics rare

Reports of sudden battery drain and difficulty restarting the engine, potentially due to parasitic draw or charging system faults.