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LEGO 42109 App-Controlled Top Gear Rally Car

7.8/ 10
Published
March 22, 2026
Pieces
463
MSRP / street
$129 USD

BrickScore breakdown

  • Build quality8.5/10
  • Value6.8/10
  • Instructions9/10
  • Design7.8/10

The 42109 Rally Car is a playful entry point into app-controlled Technic: a short chassis, quick build, and immediate payoff the moment you pair it with the Control+ hub and motors.

What works

LEGO’s digital instructions remain the gold standard here — clear angles, smooth rotation, and smart callouts for orientation-sensitive steps. The model is sturdy enough for indoor runs on smooth floors, and the drivetrain is approachable if you’re new to geared layouts.

Pros

    Cons

      Who it’s for

      If you’re buying primarily for play, this is an easy recommend. If you’re optimizing for static display value or long build hours per dollar, larger non-powered Technic sets often win — but they won’t replicate the same RC grin.

      Verdict

      A confident 7.8: premium LEGO execution with a value story that only fully lands if you’ll actually drive it.