Introduction

Aprilia - RS 50 (1999, ZD4TS0)

The Aprilia RS 50 with the type designation ZD4TS0 from the year 1999 is part of the RS model range in the 50 cc class. This version combines a sporty design with robust technology and is aimed at riders seeking a powerful small-displacement bike with a racing character.

Model History

At the end of the 1990s, the RS 50 series underwent various modifications to meet different market demands and registration requirements. The ZD4TS0 variant represents one of these adaptations, featuring modified decals or component adjustments. While visual details were updated, the technical foundation remained essentially unchanged.

Technical Specifications

The RS 50 (ZD4TS0) is powered by a liquid-cooled single-cylinder two-stroke engine with approximately 49.9 cm³ displacement. Comparable models typically deliver around 4.7 kW (6.4 hp). The engine is paired with a 6-speed manual gearbox. Power is transmitted to the rear wheel via a chain. Fuel delivery is handled by a carburettor, as was common in the late 1990s.

Chassis and Brakes

The frame is based on an aluminium bridge construction, designed for rigidity and sporty handling. A high-quality upside-down fork or conventional telescopic fork is fitted at the front, while a monoshock handles rear suspension duties. Braking is managed by a large disc at the front and a smaller disc at the rear. Typical tyre sizes for this class include **100/80-17 at the front** and **130/70-17 at the rear**.

Dimensions & Weight

Seat height is approximately **820 mm**, typical for sporty 50 cc models. The wet weight is generally around **132 kg**. The fuel tank has a capacity of approximately **14.5 litres**, a standard size in the RS series. Overall length is around **1,965 mm**, width approx. **720 mm**, and the wheelbase measures about **1,355 mm**.

Colour Variants

The ZD4TS0 version was likely offered in classic RS colour schemes with racing-inspired graphics, including high-contrast accents, striping, and logos that highlight its sporty appeal. Technically, this variant was largely identical to other RS 50 models – the differences were mainly aesthetic.