Technic

Stunt Show Truck & Bike

A pull-back stunt bike that actually launches through a ring of fire, and that is the whole joy of it.

Brick Rated Score

3.7/5

Set 42106 · 2020

Pieces610

Minifigsn/a

Year2020

Set number42106

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The verdict

This is one of those sets where the fun happens after you finish building, not during.

You get a muscle-car style truck, a trailer that folds out into a launch ramp, a buildable ring of fire, and a chunky stunt bike powered by that big pull-back motor. Winding it up and sending it flying is genuinely a giggle, though landing it upright is a coin flip. If you want a budget Technic set with real play in it, this delivers. If you want an engineering puzzle, it will feel thin.

Best for: Younger Technic builders (and parents) who want a set that does something dramatic when it's done

The full review

What it is

The moment this set earns its keep is the first time you crank the bike back, let go, and watch it tear up the ramp and punch through the ring of fire. That's the whole pitch, and it works. What you build to get there is a trio of vehicles: a beefy muscle-style truck with opening doors and top steering, a trailer that unfolds into the launch ramp, and the stunt bike itself with its fat tires and that unmistakable large pull-back motor buried in the middle. It's a 2-in-1, so once you've had your fun there's a stadium truck B-model waiting in the instructions. For 610 pieces at a budget price, there's a surprising amount going on in the box.

The catch

I'll be straight with you about where it falls short. This is Technic in name and wheels more than in mechanism. Aside from the pull-back motor, there's very little of the gearing and linkage that makes the bigger Technic sets sing, and the truck doesn't even have working steering on its own. The stunt itself is finicky too. You need a clean run-up and a bit of luck, because more often than not the bike clears the hoop and then flops onto its side on landing. The sticker sheet is also on the busy side for a set this small, 21 of them, and once they're all on the truck it can look a little cluttered rather than clean. None of this is a dealbreaker at the price, but it's the difference between a good set and a great one.

Who it's for

This one is easy to place. If you're buying for a younger builder, or you just want a Technic set that puts on a show and survives being crashed into the wall a hundred times, this is a lovely little pick and the pull-back launches never really get old. If you're an adult builder chasing intricate functions, gearboxes, and that slow satisfying reveal of a working mechanism, you'll build this in an evening and feel like you skipped the good part. It has been retired since 2021, so it now lives on the secondary market, but it still turns up around its original price, which keeps it a sensible buy for the play value.

The parts story

What the build is actually like, and the pieces worth knowing about.

The build is quick, friendly, and nicely varied for its size. You start on the stunt bike, which comes together from angled beams and shows off just how much character you can get out of a small handful of Technic parts. Then the truck's frame and the mechanics go in, and that middle stretch is the most interesting stretch of the whole thing, watching the designers wrap the bulky pull-back motor into the bodywork so it hides in plain sight. It's the kind of build a newer Technic fan can finish confidently in a sitting, and an experienced one can knock out in an evening while enjoying the tidy little solutions.

The headline part is that large 6x5x3 pull-back motor, a component that's been kicking around Technic sets since 2013 and is notoriously awkward to disguise. The clever integration here, framing the whole bike around it and dressing it with skull stickers, is the standout parts moment. Beyond that, the chunky bike tires and the muscle-car wheels give you some genuinely useful pieces, and the assortment of Technic panels and connectors is decent fodder for a parts drawer. There are no rare printed elements to chase, the detailing is all stickers, so approach it for the play and the play-worthy pieces rather than for anything a collector would hunt down.

Fun facts

01The trailer isn't just a trailer, it folds out into the launch ramp the bike jumps from, so one build does double duty.
02The pull-back motor at the bike's heart first appeared in LEGO Technic sets back in 2013 and shows up across many pull-back models.
03It's a 2-in-1 set, the alternate B-model rebuilds the parts into a stadium truck.
04The set carried a 49.99 dollar retail price and was retired in 2021, making it a short-lived budget-tier Technic release.