Introduction

Aprilia - RS 50 (1999–2001, ZD4PG)

The Aprilia RS 50 from 1999 to 2001 with type designation ZD4PG is a further development of the sporty 50 cc RS models. It combines the classic RS design with typical components of production vehicles from that era and targets riders looking for a sporty style combined with everyday usability in the small-displacement class.

Model History

At the turn of the millennium, Aprilia introduced updates and refinements across the RS 50 model range. The ZD4PG version represents one of these developments and can be seen as a technical or visual successor to earlier versions. During the production period, adjustments were made to the paint schemes, graphics, and minor components, while the overall vehicle layout remained unchanged.

Technical Specifications

The RS 50 (ZD4PG) is powered by a liquid-cooled single-cylinder two-stroke engine with a displacement of around 49.9 cm³. Its output is typically around 4.7 kW (6.4 hp), according to technical specifications of comparable RS models. The engine is paired with a 6-speed gearbox, and power is transferred to the rear wheel via chain drive. A carburettor handles fuel delivery, in line with the technology of the time.

Chassis and Brakes

The chassis is built around an aluminium bridge frame, optimised for sporty and agile handling. A conventional telescopic fork is used up front, while a mono-shock absorber is mounted at the rear. Braking is handled by a large disc brake at the front and a slightly smaller one at the rear. Typical tyre dimensions for this class are 100/80-17 at the front and 130/70-17 at the rear.

Dimensions & Weight

Seat height is approximately **820 mm**, a typical figure for sporty 50 cc models. The curb weight is estimated to be around **132 kg**, similar to other RS 50 variants. The fuel tank holds approximately **14.5 litres**. Overall vehicle length is around **1,965 mm**, width approximately **720 mm**, with a wheelbase in the region of **1,355 mm**.

Colour Variants

The ZD4PG version was likely offered in classic RS paint finishes with racing-style graphics, including contrasting stripes, sponsor logos, and colourful accents to highlight its motorsport character. Technically, this version was largely identical to the standard models – differences were primarily visual or trim-based.