LEGO Technic 42123 McLaren Senna GTR

LEGO Technic set 42123, “McLaren Senna GTR”, represents a track-focused McLaren interpreted through the mechanical building style of Technic.

The model is based on the McLaren Senna GTR, bringing a licensed motorsport subject into the Technic range. Its low profile, angular bodywork and rear wing define the car’s visual identity. Within Technic, it sits among licensed vehicles where structural building, recognisable shaping and mechanical details are central to the design.

The build uses 830 Technic elements for the frame, body panels and visible exterior details. Known features of the model include working steering, opening doors and an engine with moving pistons, all built with the axles, connectors and panels typical of Technic construction.

This set is suited to builders who want a licensed McLaren model for careful play or display. In a Technic collection, it can be placed alongside other performance cars as a circuit-oriented interpretation, identified by the Senna GTR subject and by its emphasis on visible mechanisms.

Inventory of set 42123

The inventory of set 42123 lists 830 pieces, spare parts excluded: 131 different lots (one shape in one color) for 102 part shapes. The box also contains 14 spare parts, for small elements that are easy to lose.

Colors of set 42123

Main color: black, making up 53% of the parts, followed by blue (19%) and light bluish gray (12%).

Part types

Most common parts in set 42123

99 of the 102 part shapes in this set have their own page on Setobrick, with their colors, element numbers and the other sets that use them. See all LEGO parts

Exclusive parts in set 42123

3 part shapes in set 42123 appear in no other set in the catalog, most often printed elements, stickers or molds specific to the model. If one gets lost, you will need to look for it individually, for example on BrickLink, rather than in another set. Counting colors, 4 lots in the set are not found in any other set.

Rebuilding set 42123 from another set

Share of the parts of set 42123 found in each of these similarly sized sets, counting shape, colour and quantity:

Set 42114 6x6 Volvo Articulated Hauler supplies 62% of them: enough to build a good part of the model before filling in the rest piece by piece.

Size of set 42123 within its line

With 830 pieces, set 42123 ranks #124 out of 443 Technic sets in our database, which have an average of 658 parts. Among the 519 sets released in 2021, it ranks #81.