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Set 42109 App-Controlled Top Gear Rally Car
Technic

App-Controlled Top Gear Rally Car

The App-Controlled Top Gear Rally Car 42109 is a remote-controlled LEGO Technic model made in collaboration with the Top Gear television show. Built from 463 pieces across 95 unique elements, it forms a compact rally car with drive, steering and all-wheel function, controlled through the LEGO Control+ app on a smartphone.

Set number
42109
Year
2020
Pieces
463
Minifigures
0
Theme
Technic
Different parts
95
What can I build with it?

View the official building instructions at LEGO® ↗

Parts list 95

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 (10)

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

Description

Function first, over pure looks

As with most Technic sets, function takes priority here: built-in motors handle drive and steering, while the app on a connected smartphone controls throttle, braking and steering angle. Black, blue and red combine with Light Bluish Grey chassis parts for a sporty rally look reminiscent of real motorsport liveries. With 463 pieces from only 95 unique elements, the model leans heavily on standard Technic pieces such as axles, pins and connectors rather than specialist shapes, which gives it a clean, functional appearance.

95 elements for a fully working model

The relatively low count of 95 unique elements is typical for function-driven Technic sets, where the same axles, pins and connectors get used repeatedly throughout the build. The parts list on this page shows exactly which Technic elements go into the model, which helps when reordering a missing or misplaced piece. For Technic fans designing their own creations, the set also offers a useful reference for which standard parts work well in red and blue for motorsport-style builds.

App control instead of a standard remote

Rather than a separate remote control, the model relies on the free LEGO Control+ app, which handles steering and drive directly from a smartphone. That keeps the set free of extra hardware but does require a compatible Bluetooth-enabled device. The app also displays virtual instruments such as speed and steering angle, adding a playful layer on top of simply driving the car around. For anyone who enjoys the technical side of building, that app integration is really the main appeal of the set.

A compact format for builders with some Technic experience

At 463 pieces, the rally car ranks among the smaller app-controlled Technic models, making it a reasonable entry point into remote-controlled Technic sets without committing to a flagship build of well over a thousand pieces. Some prior experience with Technic building techniques helps, since axles and pins need to sit precisely for the steering and drive to work smoothly. Anyone planning a larger app-controlled model later gains practical experience here with motors and control logic first.

FAQ

How many pieces does the App-Controlled Top Gear Rally Car 42109 have?
The set has 463 pieces across 95 unique elements.
How is the model controlled?
Through the free LEGO Control+ app over Bluetooth, with no separate remote control needed.
Do you need Technic experience to build it?
Basic Technic building skills help, since axles and pins need to sit precisely for the steering and drive to work, but it's manageable for a confident beginner.

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