What sets a dragster apart from other Technic vehicles?

The long, narrow body and oversized rear wheels are the defining features, recreated here using the 225 pieces of set 42103.

Can this set be rebuilt into something else?

Yes, as a 2-in-1 set, 42103 includes a second set of instructions for another model built from the same pieces.

What colours does the model use?

Black forms the structure, Blue provides the main accent, and Light Bluish Gray and Dark Bluish Gray complete the wheels and details.

Technic

Dragster

Dragster is a LEGO® Technic set that turns 225 pieces into a long, narrow racing vehicle with oversized rear wheels, styled after real acceleration cars. As a 2-in-1 set, the same parts can be rebuilt into a second model. With no minifigures involved, the focus sits entirely on the 69 unique parts and the vehicle's technical build.

Set number: 42103
Year: 2020
Pieces: 225
Minifigures: 0
Theme: Technic
Different parts: 69

What can I build with it?

View the official building instructions at LEGO® ↗

Parts list 69

As BrickLink list (XML)

Import on BrickLink: Wanted → Upload, upload the file (or paste its content), pick a Wanted List and add the parts.

Spare parts (11)

These extra parts come with the set in case one gets lost.

Description

Built around a real racing shape

The defining feature of a dragster is its long, narrow body paired with oversized rear wheels and smaller front ones, a shape borrowed directly from real acceleration racing vehicles. The 225 pieces recreate that silhouette using an open Technic chassis rather than a closed body shell, which means the set shows more of its internal connections than most small vehicles do, making the underlying structure part of the visual appeal rather than something hidden. Turning the model over reveals exactly how the axles and connectors line up to create that shape.

A second model included

As is typical for smaller Technic sets, the instructions include a second model buildable from the same 225 pieces, doubling the build without requiring any extra parts. With only 69 unique elements, the alternate build stays approachable, making this a reasonable choice for anyone who wants to try two different models without committing to a larger, more complex Technic set. Both instruction booklets ship in the box, so no separate download is needed to build the second version.

A cool, technical colour scheme

Black forms the structural chassis and connecting elements, while Blue provides a clear accent across the bodywork. Light Bluish Gray and Dark Bluish Gray split the wheel and structural detailing between them, giving the set a restrained, mechanical look consistent with the wider Technic range. The exact distribution of all 69 parts by colour is listed further up this page.

A compact way into Technic

At 225 pieces and 69 unique parts, Dragster sits toward the smaller end of the Technic line, making it a reasonable starting point before moving on to larger models with motors or remote control. Anyone wanting to understand basic Technic connections will find a compact but complete example here, and the parts list is a useful reference for identifying individual elements later, whether for a repair or a separate custom build.

FAQ

What sets a dragster apart from other Technic vehicles?: The long, narrow body and oversized rear wheels are the defining features, recreated here using the 225 pieces of set 42103.
Can this set be rebuilt into something else?: Yes, as a 2-in-1 set, 42103 includes a second set of instructions for another model built from the same pieces.
What colours does the model use?: Black forms the structure, Blue provides the main accent, and Light Bluish Gray and Dark Bluish Gray complete the wheels and details.