Introduction

Sporty A1 Supermoto with EURO 5 Approval

The "Aprilia – SX 125 (2021–2022, ZD4KTB00)" is a modern 125 cc supermoto motorcycle, specifically designed for young riders with an A1 license.
Introduced in 2021, this version complies with the strict EURO 5 standards and combines bold design with everyday usability.
Aprilia positions the SX 125 as a dynamic entry-level bike with offroad inspiration and urban practicality – ideal for commuters, beginners, and ambitious young riders.

Model History

Updated to Meet New Emission Standards

Type code ZD4KTB00 refers to the revised SX 125 version launched in 2021, replacing the earlier ZD4KXB00.
This generation saw key updates to the engine and electronics to meet EURO 5 emissions without sacrificing the sporty performance of its predecessor.
Visually, the SX 125 remains true to its angular design but features new graphics and refined details.
In the entry-level 125 cc segment, it continues to compete with bikes like the Yamaha WR125X or Beta RR 125 Motard, standing out with Italian flair and solid engineering.

Technical Details

Engine, Performance and Emissions

The SX 125 (2021–2022) is powered by a liquid-cooled, single-cylinder four-stroke engine with 124 cc displacement and electronic fuel injection.
It delivers a maximum power output of **11 kW (15 hp)** at around 10,000 rpm and a peak torque of **11.2 Nm** at 8,000 rpm.
The engine is tuned for rideability, smooth power delivery, and full compliance with the **EURO 5 emission standard**.
A 6-speed gearbox ensures sporty shifting, and final drive is via chain.
Thanks to injection and catalytic converter, the SX 125 is efficient and low in emissions.

Chassis, Brakes & Dimensions

At the front, a 41 mm upside-down fork is used; at the rear, a single shock absorber with progressive linkage.
Braking system includes a **260 mm wave disc with ABS** at the front and a **220 mm disc at the rear** – perfect for safe braking on all surfaces.
Tires: **100/80‑17 front**, **130/70‑17 rear**, mounted on 17-inch alloy wheels.
Seat height: approx. 880 mm, curb weight: around 134 kg, fuel tank: about 6.2 litres.
Top speed: approx. 110 km/h, fuel consumption (WMTC): around 2.6–2.8 l/100 km (depending on riding style).
It is equally suited for city commuting and spirited rides on country roads.

Design and Variants

Distinctive Supermoto Style with Everyday Practicality

The SX 125 (2021–2022) stays true to Aprilia’s design language: aggressive supermoto styling with sharply cut bodywork, high front fender and sporty graphics.
A fully digital LCD display provides information on speed, revs, clock, trip meter, and more.
LED tail light, striking colour schemes and high-quality components such as the stainless steel exhaust underline its premium character.
Variants were mostly differentiated by colour combinations or market-specific equipment.
Aprilia offered a wide range of accessories: hand guards, decal kits, or top cases for customisation.