Introduction

The model "Aprilia - SR 50 (2004, ZD4RLD)" is a sporty scooter produced by the Italian manufacturer Aprilia in 2004. It belongs to the SR 50 series, which has been known for its innovative technology and dynamic design since its introduction in 1992. The SR 50 models were developed to offer a combination of performance, style, and everyday usability, especially for younger riders or those with limited license classes. The SR 50 from 2004 marks the beginning of a new generation of this series, featuring a fresh, more aggressive look and technical improvements.

History of the SR 50 Series

The SR 50 series was first introduced in 1992 and is considered a pioneer in the segment of sporty 50cc scooters. By 2004, Aprilia had already set several milestones, including the introduction of liquid cooling (1994), dual disc brakes (1997), and direct injection (1999 with the DiTech system).

Technical Features

Technically, the Aprilia SR 50 (2004, ZD4RLD) is powered by a single-cylinder two-stroke engine with a displacement of 49cc. This engine is liquid-cooled and features a carburetor, with power limited to about 3.3 kW (4.5 hp) at 6,500 rpm to comply with legal regulations for the 45 km/h class. In derestricted form, the power can be higher, depending on local regulations. The vehicle is equipped with a continuously variable transmission (CVT), allowing for easy handling and direct power transmission. The top speed is about 45 km/h in restricted form, while derestricted variants can drive significantly faster.

Chassis and Brakes

The chassis includes a hydraulic telescopic fork at the front and a single shock absorber at the rear, providing the scooter with sporty stability and sufficient comfort for city traffic. The braking system consists of a 190 mm diameter disc brake at the front and a 110 mm drum brake at the rear, ensuring reliable deceleration. With a dry weight of about 95 kg and a wheelbase of 1,290 mm, the SR 50 offers high maneuverability. The tires, sized 130/60-13 on both axles, emphasize the sporty character and ensure good grip.

Design and Color Variants

The Aprilia SR 50 (2004, ZD4RLD) was available in several color variants, which could vary depending on the market. Common paint finishes include "Nero Aprilia" (Black), "Rosso Dragon" (Red), and "Grigio Titanio" (Titanium Gray), which emphasized the dynamic look of the scooter. For the 2004 model year, there are no clear indications of official special models, as seen in later SR 50 variants (e.g., Replica SBK). Production focused on a uniform series version, with individual customizations possible by dealers or markets, but not classified as official special models.