The LEGO Technic 42112 Concrete Mixer Truck is a 1,163-piece large Technic construction vehicle — with a rotating drum that mixes concrete as the truck drives, front axle steering, opening cab with interior, and the realistic proportions of a real ready-mix truck.
Why Collectors Love It
How Ready-Mix Concrete Gets to Your Building Site
A concrete mixer truck leaves the plant with dry ingredients and water in the drum. The drum rotates continuously during transit — mixing the concrete to the right consistency by the time it arrives. The LEGO Technic 42112 replicates this: drive the truck forward and the rear axle gear train turns the drum. A self-explanatory piece of construction engineering.
The Gear Train — Drum to Wheel
The drum is connected to the rear axle through a bevel gear train — as the rear wheels turn, the bevel gears step up the rotation speed for the drum. The correct ratio means the drum turns at a realistic speed relative to the truck's motion. Building this gear connection is one of the satisfying moments of the build — a simple mechanism with a clearly visible result.
Specifications
- Piece Count: 1,163
- Set Number: 42112
- Theme: LEGO Technic
- Features: Rotating drum (connected to rear axle), front axle steering, opening cab, rear discharge chute
- Year Released: 2020
- Condition: Brand New, Sealed
- EAN: 5702016616552
Your Questions Answered
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Customers Love It!
⭐⭐⭐⭐⭐
"My son is obsessed with construction vehicles. The concrete mixer is perfect — the drum actually rotates when he pushes it, which he showed every person in our family. The cab detail is a bonus. Great Technic set for the price."
"A solid large Technic vehicle. The drum rotation mechanism is well-implemented — the gear ratio feels right for a real mixer. The truck proportions are accurate to a real ready-mix vehicle. Good construction detail throughout."
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