Unleash the Speed!
Build the McLaren Senna GTR

Experience the thrill of building this 830-piece LEGO Technic replica of the ultimate track-focused supercar. A rewarding challenge for car enthusiasts!

🏛 Technic
Set #42123

McLaren Senna GTR

The McLaren Senna GTR is a bold and striking Technic representation of a track legend.

🏆 Best For: Perfect for Technic fans and car enthusiasts who enjoy a detailed and engaging building experience. ⏱ 4.5 hr build 🧩 830 pcs 🎂 Ages 10+
★★★★☆ 4.1 from 4 reviews

Fans appreciate the accurate design and engaging build experience of the McLaren Senna GTR. However, some critics point out the reliance on stickers and the lack of more advanced Technic functions.

📝 Our Take

The McLaren Senna GTR is a bold and striking Technic representation of a track legend. Capturing the aggressive lines and aerodynamic features of the real Senna GTR, this set offers a challenging build and a visually impressive display model.

This set is perfect for Technic enthusiasts and car lovers. The build provides an engaging experience with functional elements and accurate detailing, resulting in a rewarding display piece.

Skip this if you prefer minifigure-scale models or simpler building experiences. Consider Speed Champions sets for smaller, more accessible car models.

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🧱 Building Experience

🧩
830
Pieces
4.5h
Build Time
📊
Intermediate
Difficulty
📏
32cm × 12cm × 9cm
Dimensions
Build Highlights:
  • Detailed recreation of the McLaren Senna GTR's aerodynamic features
  • Functional steering and V8 engine with moving pistons
  • Challenging assembly process with intricate Technic components
  • Eye-catching display model with authentic livery and design

📈 Investment Analysis

→ Price stable
B
Investment Grade
⏳ Active
The McLaren Senna GTR (42123) is a retired Technic set that has the potential to appreciate in value. Its appeal to both Technic builders and automotive enthusiasts provides a solid foundation for growth. While not a limited edition, its retirement status and reasonable piece count make it a potentially good investment. However, Technic sets can be volatile, so monitor the market trends.

Not Financial Advice: Content is for educational purposes only. Past performance doesn't guarantee future results. Full disclaimer

📖 About This Set

Looking for the ultimate gift for a child or teen who loves supercar toys? This LEGO® Technic™ McLaren Senna GTR™ (42123) is a great choice – and adult McLaren fans will love it too! Packed with authentic features inspired by the original track-focused supercar icon, this collectible model toy is sure to set pulses racing.

Realistic details and powerful functions
The McLaren Senna GTR is a car unlike any other. And this awesome LEGO Technic toy version is equally impressive. Check out the V8 engine with moving pistons, iconic dihedral doors that open, plus authentic graphics and colors, just like on the real car. Steer using the wheel, then put the model on display where it’s sure to draw many admiring glances.

Open up the world of engineering
LEGO Technic sets feature realistic movement and mechanisms that introduce LEGO builders to the universe of engineering in an approachable and realistic way.

  • A stunning build for supercar fans, the LEGO® Technic™ McLaren Senna GTR™ 42123 model building kit is packed with realistic details inspired by the iconic original.
  • Check out this supercar toy model’s authentic features, like the detailed V8 engine with moving pistons and dihedral doors that open ‘up and out' in the unmistakable style of the real McLaren.
  • Enjoy steering the McLaren toy car using the wheel on top.
  • Looking for the best gift ideas for a motorsport fan or supercar lover?This set makes a great choice for kids aged 10 and up who’d love to build and display their own McLaren race car.
  • This awesome track-focused supercar toy model looks great on display and is sure to capture the imagination of any kid or adult with a passion for supercars, motorsport and McLaren.
  • Model measures over 3 in. (9 cm) high, 12 in. (32 cm) long and 4 in. (12 cm) wide.
  • This collectible McLaren toy car features eye-catching graphics and colors, just like on the real supercar.
  • The LEGO® Technic™ universe offers advanced building toys for LEGO fans who are ready for their next building challenge.
  • LEGO® Technic™ components meet rigorous industry standards to ensure they are consistent, compatible and connect reliably every time – it's been that way since 1958.
  • LEGO® Technic™ components are dropped, heated, crushed, twisted and analyzed to make sure they meet strict global safety standards.

Compare Similar Sets

Compared to other Technic car models, the McLaren Senna GTR offers a balance of complexity and display appeal. While sets like the Lamborghini Sián FKP 37 (42115) are larger and more intricate, the Senna GTR provides a more accessible building experience at a lower price point. For those seeking minifigure-scale cars, the Speed Champions series offers more compact and playable alternatives.

📦 Full Parts Inventory - 102 unique parts • 626 total pieces

Technic Pin Connector Hub with 2 Perpendicular Axles Technic Pin Conne...
Part #: 10197 Black
Slope Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges] Slope Curved 4 x ...
Part #: 11153 Black
Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Technic Axle Pin ...
Part #: 11214 20× Dark Bluish Gray
Slope Curved 2 x 1 No Studs [1/2 Bow] Slope Curved 2 x ...
Part #: 11477 Black
Slope Curved 2 x 1 No Studs [1/2 Bow] Slope Curved 2 x ...
Part #: 11477 Light Bluish Gray
Technic Panel Fairing #21 5L Small Smooth, Side B Technic Panel Fai...
Part #: 11946 Light Bluish Gray
Technic Panel Fairing #21 5L Small Smooth, Side B Technic Panel Fai...
Part #: 11946 Black
Technic Panel Fairing #21 5L Small Smooth, Side B Technic Panel Fai...
Part #: 11946 Blue
Technic Panel Fairing #22 5L Small Smooth, Side A Technic Panel Fai...
Part #: 11947 Black
Technic Panel Fairing #22 5L Small Smooth, Side A Technic Panel Fai...
Part #: 11947 Blue
Technic Panel Fairing #22 5L Small Smooth, Side A Technic Panel Fai...
Part #: 11947 Light Bluish Gray
Technic Axle 5 with Stop Technic Axle 5 wi...
Part #: 15462 Reddish Brown
Technic Pin Connector Round 1L [Beam] Technic Pin Conne...
Part #: 18654 14× Black
Technic Pin Connector Round 1L [Beam] Technic Pin Conne...
Part #: 18654 Light Bluish Gray
Plate Special 1 x 2 with Pin Hole Underneath Plate Special 1 x...
Part #: 18677 Black
Technic Panel Curved 3 x 13 Technic Panel Cur...
Part #: 18944 Black
Technic Panel Curved and Bent 6 x 3 Technic Panel Cur...
Part #: 24116 Dark Bluish Gray
Technic Axle 3 with Stop Technic Axle 3 wi...
Part #: 24316 13× Reddish Brown
Tile 2 x 3 Tile 2 x 3
Part #: 26603 Black
Technic Pin with Friction Ridges Lengthwise and Center Slots Technic Pin with ...
Part #: 2780 Black
Technic Pin Connector Hub with 2 Axles Technic Pin Conne...
Part #: 27940 Blue
Technic Steering Wheel Small (3 Studs Diameter) Technic Steering ...
Part #: 2819 Black
Plate 1 x 1 Plate 1 x 1
Part #: 3024 Black
Plate 1 x 1 Plate 1 x 1
Part #: 3024 Light Bluish Gray
Plate 1 x 1 Plate 1 x 1
Part #: 3024 Trans-Clear
Plate 2 x 8 Plate 2 x 8
Part #: 3034 Black
Bar 4L (Lightsaber Blade / Wand) Bar 4L (Lightsabe...
Part #: 30374 White
Bar 4L (Lightsaber Blade / Wand) Bar 4L (Lightsabe...
Part #: 30374 Trans-Red
Tyre 43.2 x 14 Tyre 43.2 x 14
Part #: 30699 Black
Tile 1 x 1 with Groove Tile 1 x 1 with G...
Part #: 3070b Black
Technic Pin 3/4 Technic Pin 3/4
Part #: 32002 Tan
Technic Axle and Pin Connector Angled #1 Technic Axle and ...
Part #: 32013 Blue
Technic Axle and Pin Connector Angled #1 Technic Axle and ...
Part #: 32013 Black
Technic Axle and Pin Connector Angled #1 Technic Axle and ...
Part #: 32013 Light Bluish Gray
Technic Axle and Pin Connector Angled #6 - 90° Technic Axle and ...
Part #: 32014 Black
Technic Axle and Pin Connector Angled #5 - 112.5° Technic Axle and ...
Part #: 32015 Blue
Technic Axle and Pin Connector Angled #2 - 180° Technic Axle and ...
Part #: 32034 Red
Technic Axle Connector with Axle Hole Technic Axle Conn...
Part #: 32039 Blue
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Technic Pin Long ...
Part #: 32054 Light Bluish Gray
Technic Axle 2 Notched Technic Axle 2 No...
Part #: 32062 22× Red
Technic Axle 2 Notched Technic Axle 2 No...
Part #: 32062 Black
Technic Beam 1 x 6 Thin Technic Beam 1 x ...
Part #: 32063 Black
Technic Beam 1 x 6 Thin Technic Beam 1 x ...
Part #: 32063 Light Bluish Gray
Technic Beam 1 x 7 Thin Technic Beam 1 x ...
Part #: 32065 White
Technic Axle 5 Technic Axle 5
Part #: 32073 Light Bluish Gray
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Technic Bush 1/2 ...
Part #: 32123b Light Bluish Gray
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Technic Bush 1/2 ...
Part #: 32123b Yellow
Technic Beam 2 x 4 L-Shape Thick Technic Beam 2 x ...
Part #: 32140 Light Bluish Gray
Technic Beam 2 x 4 L-Shape Thick Technic Beam 2 x ...
Part #: 32140 16× Black
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Technic Axle and ...
Part #: 32184 Light Bluish Gray
Technic Axle and Pin Connector Angled #4 - 135° Technic Axle and ...
Part #: 32192 Light Bluish Gray
Axle Hose, Soft 11L Axle Hose, Soft 11L
Part #: 32199 Blue
Axle Hose, Soft 16L Axle Hose, Soft 16L
Part #: 32202 Black
Technic Gear 12 Tooth Double Bevel Technic Gear 12 T...
Part #: 32270 Black
Technic Beam 1 x 15 Thick Technic Beam 1 x ...
Part #: 32278 Blue
Technic Beam 1 x 15 Thick Technic Beam 1 x ...
Part #: 32278 Black
Technic Axle and Pin Connector Perpendicular Double Technic Axle and ...
Part #: 32291 Light Bluish Gray
Technic Beam 1 x 5 Thick Technic Beam 1 x ...
Part #: 32316 16× Black
Technic Beam 1 x 3 Thick Technic Beam 1 x ...
Part #: 32523 Dark Bluish Gray
Technic Beam 1 x 3 Thick Technic Beam 1 x ...
Part #: 32523 11× Black
Technic Beam 1 x 3 Thick Technic Beam 1 x ...
Part #: 32523 Light Bluish Gray
Technic Beam 1 x 7 Thick Technic Beam 1 x ...
Part #: 32524 Light Bluish Gray
Technic Beam 1 x 7 Thick Technic Beam 1 x ...
Part #: 32524 Black
Technic Beam 1 x 7 Thick Technic Beam 1 x ...
Part #: 32524 Blue
Technic Beam 3 x 5 L-Shape Thick Technic Beam 3 x ...
Part #: 32526 Blue
Technic Beam 3 x 5 L-Shape Thick Technic Beam 3 x ...
Part #: 32526 10× Black
Technic Pin Connector Perpendicular Long Technic Pin Conne...
Part #: 32557 Black
Technic Pin Connector Perpendicular Long Technic Pin Conne...
Part #: 32557 Light Bluish Gray
Plate 1 x 8 Plate 1 x 8
Part #: 3460 Black
Plate 1 x 6 Plate 1 x 6
Part #: 3666 Light Bluish Gray
Technic Pin without Friction Ridges Lengthwise Technic Pin witho...
Part #: 3673 Light Bluish Gray
Technic Axle 4 Technic Axle 4
Part #: 3705 Red
Technic Axle 6 Technic Axle 6
Part #: 3706 Black
Plate 1 x 4 Plate 1 x 4
Part #: 3710 Black
Technic Bush Technic Bush
Part #: 3713 Light Bluish Gray
Technic Pin Long without Friction Ridges, with Anti-Roll Notch Technic Pin Long ...
Part #: 39888 Tan
Technic Beam 1 x 9 Thick Technic Beam 1 x ...
Part #: 40490 Dark Bluish Gray
Technic Beam 1 x 13 Thick Technic Beam 1 x ...
Part #: 41239 12× Black
Technic Beam 1 x 2 Thin Technic Beam 1 x ...
Part #: 41677 12× Black
Technic Axle and Pin Connector Perpendicular Double Split Technic Axle and ...
Part #: 41678 Black
Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Technic Axle and ...
Part #: 42003 19× Black
Technic Driving Ring Connector Smooth [2 rounded and 2 flat side walls] Technic Driving R...
Part #: 42195 Black
Technic Panel Car Mudguard Arched 9 x 2 x 3 with Light Bluish Grey/Black Decorations print Technic Panel Car...
Part #: 42531pr0001 Blue
Technic Panel Car Mudguard Arched 9 x 2 x 3 with Light Bluish Grey/Black Decorations print Technic Panel Car...
Part #: 42531pr0002 Blue
Technic Pin 1/2 Technic Pin 1/2
Part #: 4274 Blue
Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot Technic Pin Long ...
Part #: 42924 68× Blue
Technic Axle Pin with Friction Ridges Lengthwise Technic Axle Pin ...
Part #: 43093 17× Blue
Technic Beam 1 x 2 Thick Technic Beam 1 x ...
Part #: 43857 12× Black
Technic Axle 7 Technic Axle 7
Part #: 44294 Yellow
Tyre 43.2 x 22 ZR Tyre 43.2 x 22 ZR
Part #: 44309 Black
Technic Pin Connector Perpendicular 2 x 2 Bent Technic Pin Conne...
Part #: 44809 Light Bluish Gray
Technic Axle 3 Technic Axle 3
Part #: 4519 Yellow
Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Technic Tooth 1 x...
Part #: 48267 Blue
Panel 1 x 2 x 1 [Rounded Corners] Panel 1 x 2 x 1 [...
Part #: 4865b Black
Slope 30° 1 x 1 x 2/3 (Cheese Slope) Slope 30° 1 x 1 x...
Part #: 54200 Trans-Clear
Technic Axle 8 with Stop Technic Axle 8 wi...
Part #: 55013 Dark Bluish Gray
Wheel 30.4 x 20 without Pinholes, with Reinforced Rim Wheel 30.4 x 20 w...
Part #: 56145 Black
Wheel 30 x 14 Wheel 30 x 14
Part #: 56904 Black
Technic Axle Connector Smooth [with x Hole + Orientation] Technic Axle Conn...
Part #: 59443 Dark Bluish Gray
Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Technic Beam 1 x ...
Part #: 60483 Dark Bluish Gray
Technic Beam 3 x 3 T-Shape Thick Technic Beam 3 x ...
Part #: 60484 Black
Technic Axle 9 Technic Axle 9
Part #: 60485 Light Bluish Gray
Technic Pin Connector Round [Slotted] Technic Pin Conne...
Part #: 62462 Light Bluish Gray
Technic Axle and Pin Connector Perpendicular Triple Technic Axle and ...
Part #: 63869 Light Bluish Gray
Technic Axle and Pin Connector Perpendicular Triple Technic Axle and ...
Part #: 63869 Black
Technic Panel Fairing #6 Long Smooth, Side B Technic Panel Fai...
Part #: 64393 Blue
Technic Panel Fairing #5 Long Smooth, Side A Technic Panel Fai...
Part #: 64681 Blue
Technic Axle and Pin Connector Perpendicular Technic Axle and ...
Part #: 6536 19× Black
Technic Brick 1 x 1 with Pin Hole Technic Brick 1 x...
Part #: 6541 Black
Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Square Holes] Technic Pin Conne...
Part #: 65487 27× Black
Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Square Holes] Technic Pin Conne...
Part #: 65487 Blue
Technic Pin Connector Hub Perpendicular 3L with 4 Pins (Squared Holes) Technic Pin Conne...
Part #: 65489 Light Bluish Gray
Technic Pin Connector Toggle Joint Smooth Double with 2 Pins [Square Holes] Technic Pin Conne...
Part #: 65746 Black
Technic Axle 3 with Stud Technic Axle 3 wi...
Part #: 6587 Dark Tan
Technic Gear 12 Tooth Bevel Technic Gear 12 T...
Part #: 6589 Tan
Technic Beam 1 x 3 Thin Technic Beam 1 x ...
Part #: 6632 Black
Technic Beam 1 x 3 Thin Technic Beam 1 x ...
Part #: 6632 Red
Tile 1 x 6 with Groove Tile 1 x 6 with G...
Part #: 6636 Black
Technic Panel Fairing 2 x 3 x 1 Technic Panel Fai...
Part #: 71682 Black
Technic Panel Fairing 2 x 3 x 1 Technic Panel Fai...
Part #: 71682 Blue
Sticker Sheet for Set 42123-1 Sticker Sheet for...
Part #: 72203 [No Color/Any Color]
Hose Rigid 3mm D. 9L / 7.2cm Hose Rigid 3mm D....
Part #: 75c09 Black
Technic Panel Fairing #1 Small Smooth Short, Side A Technic Panel Fai...
Part #: 87080 Blue
Technic Panel Fairing #1 Small Smooth Short, Side A Technic Panel Fai...
Part #: 87080 Black
Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Big Squared Pin Holes] Technic Pin Conne...
Part #: 87082 Light Bluish Gray
Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Big Squared Pin Holes] Technic Pin Conne...
Part #: 87082 Black
Technic Axle 4 with Stop Technic Axle 4 wi...
Part #: 87083 Dark Bluish Gray
Technic Panel Fairing #2 Small Smooth Short, Side B Technic Panel Fai...
Part #: 87086 Blue
Technic Panel Fairing #2 Small Smooth Short, Side B Technic Panel Fai...
Part #: 87086 Black
Technic Gear Rack 1 x 7 with Axle and Pin Holes Technic Gear Rack...
Part #: 87761 Black
Slope Brick Curved 2 x 4 x 2/3 No Studs, with Bottom Tubes Slope Brick Curve...
Part #: 88930 Light Bluish Gray
The set includes a good selection of Technic pins and connectors, useful for MOC builders looking to create their own functional models. The variety of black Technic beams also provides a solid base for structural elements.

💎 Notable Parts

Blue Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot (68x) $3.40
Black Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Square Holes] (27x) $2.70
Black Technic Beam 1 x 13 Thick (12x) $1.80
Est. BrickLink Part Value
$7.90

💡 MOC Potential

🚗 Alternate race car designs
🚗 Custom supercar models
🚗 Off-road vehicle modifications

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📖 Building Instructions 2

McLaren Senna GTR Instructions
BI 3104, 144+4, 42123 V29
Download PDF
McLaren Senna GTR Instructions
BI 3104, 144+4, 42123 V39
Download PDF

Charts Inventory Statistics

102
Unique Parts
787
Total Pieces
0
Minifigures
Inventory Version: 2