Introduction

The model "Aprilia - SR 50 (2003–2012, ZD4TEA)" is a sporty scooter manufactured by the Italian company Aprilia between 2003 and 2012. It belongs to the successful SR 50 range, which has been known since its introduction in 1992 for its innovative technology and dynamic styling.
The SR 50 targets riders looking for a powerful, agile scooter for urban use – especially those who ride 50 cc vehicles under AM or similar license categories. The ZD4TEA version represents the evolution of Aprilia's 50 cc series into a modern and technically refined generation.

Model History

The ZD4TEA was introduced in 2003 as a continuation of the first SR 50 generation. Aprilia significantly updated the design and incorporated numerous technical improvements, including electronic fuel injection (DiTech) in some variants.
This model phase spanned almost a decade, during which Aprilia responded to tightening emissions standards and changing customer demands. The SR 50 became one of the most technologically advanced 50 cc scooters of its time, often compared to motorcycles in terms of equipment and performance.
The long production run of the ZD4TEA until 2012 shows how successful and versatile this platform was, before it was eventually replaced by newer models under Piaggio Group management.

Technical Specifications

The Aprilia SR 50 (2003–2012, ZD4TEA) is powered by a 49 cc single-cylinder two-stroke engine. Depending on the version, it is either carbureted or features the DiTech direct injection system, which reduces emissions and improves fuel efficiency.
The liquid-cooled engine produces about 3.5 kW (4.8 hp) at 6,500 rpm. The top speed is limited to 45 km/h in many markets due to legal restrictions, though unrestricted models can reach higher speeds. The continuously variable CVT transmission ensures smooth and simple operation.

Chassis and Brakes

The chassis features a hydraulic telescopic fork at the front and a monoshock at the rear, offering a balanced mix of comfort and sporty handling.
The braking system includes a 190 mm disc brake at the front and a 110 mm drum brake at the rear. In later variants or special editions, a rear disc brake may be fitted.
With a dry weight of about 90 kg and a wheelbase of 1,290 mm, the SR 50 is very maneuverable and suitable for urban environments. It uses 130/60-13 tires on both front and rear wheels to emphasize its sporty nature.

Colors and Special Editions

The Aprilia SR 50 (2003–2012, ZD4TEA) was available in a wide range of colors depending on the market and year. Popular paint options included "Rosso" (Red), "Nero" (Black), and "Argento" (Silver), with occasional special hues such as blue, yellow, or themed graphics.
Aprilia also introduced special editions during this production period, including "Racing Replica" or "Factory" models with racing liveries, performance tweaks, or higher-end components.
These editions made the ZD4TEA particularly popular among younger riders and tuning enthusiasts. However, many standard models were also modified by dealers or owners to personalize the scooter.