Introduction

The model "Aprilia - SR 125 (1999-2001, ZD4PX)" is a sporty scooter produced by the Italian manufacturer Aprilia between 1999 and 2001. It belongs to the SR series (Sport Racing), known for its dynamic appearance and performance-oriented technology.
The SR models were developed to offer riders a combination of urban mobility and sporty driving pleasure, targeting younger riders or enthusiasts who value agility and design.
The SR 125 (ZD4PX) represents a phase in which Aprilia strengthened its portfolio in the 125cc scooter segment, which was widespread in Europe due to the A1 driving license class.

Development and History

The SR series was introduced in the 1990s, with the SR 125 (1999-2001) considered an evolution of earlier models like the SR 50, which was launched in 1992.
While the SR 50 became known primarily as an entry-level model with a two-stroke engine, the SR 125 marked a step towards more power and a larger displacement within the same design philosophy.
The production period from 1999 to 2001 falls into an era when Aprilia expanded its position in the scooter and motorcycle market, among other things, through the use of modern technologies and the emphasis on sporty elements.
The SR 125 competed with models from other manufacturers like Piaggio or Yamaha and targeted riders looking for a vehicle with stronger performance than typical 50cc scooters.

Technical Details

Technically, the Aprilia SR 125 is powered by a single-cylinder two-stroke engine with a displacement of 124cc.
This engine is liquid-cooled and equipped with a carburetor, allowing for direct power delivery and good cooling even under demanding conditions.
The power output is about 11 kW (15 hp) at 8,500 rpm, giving the scooter a top speed of over 100 km/h (depending on tuning and legal restrictions).
The vehicle features a continuously variable CVT transmission, ensuring easy operation and smooth power transfer.

Chassis and Brakes

The chassis consists of a hydraulic telescopic fork at the front and a single shock absorber at the rear, providing a balanced combination of stability and comfort.
The braking system includes a 220 mm diameter disc brake at the front axle and a 140 mm drum brake at the rear, ensuring reliable braking performance.
With a dry weight of about 114 kg and a wheelbase of 1,290 mm, the SR 125 is light and agile, making it particularly suitable for city traffic and winding roads.
The tires, sized 130/60-13 front and rear, emphasize the sporty character and offer good grip.

Design and Variants

The Aprilia SR 125 was available in several color variants, which could vary depending on the market and production year.
Common paint finishes include "Nero Aprilia" (Black), "Rosso Dragon" (Red), and "Grigio Excalibur" (Gray), highlighting the sporty and modern look of the scooter.
There are no clear indications that Aprilia released special models or limited editions for the SR 125 (ZD4PX).
Production focused on a uniform series version designed for performance and broad market acceptance, with individual customizations possibly offered by dealers or regional markets, but not considered official special models.