Aprilia RS 125

The styling of the RS, like that of all Aprilia sports bikes, is the result of painstaking aerodynamic research. The powerful but reliable, single cylinder, two stroke, Rotax-Aprilia engine needs no introduction. The RS 125’s engine has been constantly updated over the years to keep in line with the latest emission control legislation without penalising performance. Without a doubt, the most advanced single component on the RS 125 is its frame.

Developed from Aprilia’s vast experience in GP 125 racing, the RS 125 frame is made from cast aluminium alloy with cross-ribbing reinforcement. Despite its extremely light weight, this advanced structure achieves amazing torsional rigidity, setting the standards for Aprilia’s competitors.

The rear suspension features rising rate linkages based on Aprilia’s 125 GP racing technology, for excellent traction and superb comfort even over uneven road surfaces. The braking system is the best available, and designed for maximum efficiency under competitive riding conditions. The front brake is a genuine state-of-the-art, high performance system with a radial caliper and four opposed pistons. The rear disc is 220 mm in diameter and is also equipped with metal braided hoses for perfectly balanced, high performance braking. The Aprilia RS 125 is packed with prestige components.

Aprilia RS 125 Specifications

  • Engine: Liquid cooled, single cylinder two stroke. Aluminium cylinder with Nikasil coated liner. Read valve intake. Separate lubrication. Homologated to Euro 3 standards.
  • Fuel: Dell’Orto VHST 28
  • Bore x Stroke: 54 x 54,5 mm
  • Total displacement: 124,8 cc
  • Compression ratio: 12,5 ± 0,5:1
  • Fuel system: Dell’Orto VHST 28.
  • Ignition: Electronic CDI ignition.
  • Starting: Electric
  • Generator: 12V - 180 W
  • Lubrification: Separate mixing with variable displacement, volumetric pump.
  • Gear box: 6 speed. 1st 10/30 (0.33) 2nd 14/29 (0.48) 3rd 17/27 (0.63) 4th 19/25 (0.76) 5th 21/24 (0.87) 6th 22/23 (0.67)
  • Clutch: Multi-plate in oil bath.
  • Primary drive: Gearbox: 63/19 (3.31).
  • Final drive: Chain: 17/40 (2.35).
  • Frame: Sloping twin-spar frame in thin wall box section cast aluminium, with reinforcement cross-ribbing.
  • Front suspension: Upside down hydraulic fork, Ø 40 mm. Wheel travel 120 mm.
  • Rear suspension: Swingarm with asymmetric members in thin wall box section cast aluminium. Hydraulic monoshock with adjustable spring preload. Wheel travel 120 mm.
  • Brakes: Front: Floating Ø 320 mm disc. Radial caliper with four differential diameter pistons, Ø 32 mm – Ø 27 mm. Rear: Single Ø 220 mm disc. Caliper with two Ø 30 mm pistons.
  • Wheels: Aluminium alloy. Front 3.00 x 17”; rear 4,00 x 17”.
  • Tyres: Tubeless radial. Front 110/70 17”; rear 150/60 17”.
  • Dimensions: Overall length 1955 mm Overall width (at handlebars) 720 mm Overall height (at windshield) 1100 mm Seat height 805 mm Wheelbase 1345 mm
  • Fuel tank capacity: 14 litres (3.5 litre reserve).
  • Carburettor: The 21 kW RS 125 (sold on the German market) is still equipped with a Dell’Orto PHBH 28 carburettor and is homologated to Euro 2 standard.