Free tools Windows power users keep installed
One-click scans. No signup required.
iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
For most adult builders, the right choice comes down to the car and mechanism you want on display: choose the McLaren P1 (42172) for its seven-speed gearbox, V8 engine, opening doors, and adjustable rear wing; choose the Lamborghini Sián FKP 37 (42115) for an eight-speed sequential transmission, V12 engine, steering, suspension, and scissor doors. Both are official 18+ Technic sets, and neither can be called the universal winner without independent testing of build quality or difficulty.
The Sián is a 2020 release and LEGO’s US product page snapshot showed it sold out when accessed, while the P1 appeared in LEGO’s current US Technic catalog with an add-to-bag option. Stock and prices change, so verify the model number, region, seller, and condition before paying.
At a glance: which adult Technic supercar fits you?
| Set | Official age and pieces | Mechanical and bodywork features | Availability and price evidence |
|---|---|---|---|
| McLaren P1 (42172) | 18+; 3,893 pieces | Seven-speed gearbox with shifter drum, V8 piston engine, opening doors, adjustable rear wing | LEGO’s current US Technic catalog snapshot displayed $449.99 and an add-to-bag option. LEGO’s Fall 2024 US retail catalog also listed a $449.99 US price at that time. LEGO Technic catalog · Fall 2024 US catalog |
| Lamborghini Sián FKP 37 (42115) | 18+; 3,696 pieces | Eight-speed sequential transmission, V12 engine with moving pistons, steering, front and rear suspension, scissor doors | LEGO’s US product-page snapshot displayed $449.99 and marked the set sold out. LEGO’s instructions index identifies it as a 2020 release. Sián product page · Sián instructions index |
| McLaren Formula 1 Race Car (42141) | 18+; 1,434 pieces | V6 piston engine, steering, suspension, differential | LEGO’s official page marks it retired. It is an F1 race car, not a road-going supercar. McLaren F1 product page |
The piece counts are specifications, not difficulty scores. A larger inventory does not prove that a model is harder, more accurate, or more satisfying to build.
How to choose between the P1 and Sián
Start with the real car you want to own in miniature
These sets represent different design languages. The McLaren P1 is the better thematic match if you want a hybrid-era McLaren silhouette and a display model centered on a seven-speed gearbox, V8 pistons, and a movable rear wing. The Lamborghini Sián is the stronger fit if the defining details for you are a V12, scissor doors, and visible steering and suspension functions.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
That preference matters more than a small difference in piece count. The P1 has 3,893 pieces, while the Sián has 3,696; the available official material does not establish that the extra 197 pieces make the P1 more difficult or mechanically richer overall.
Use the functions as your decision filter
- Gearbox interest: the P1 uses a seven-speed gearbox with a shifter drum; the Sián uses an eight-speed sequential transmission.
- Engine presentation: the P1 has a V8 piston engine; the Sián has a V12 engine with moving pistons.
- Exterior interaction: the P1 has opening doors and an adjustable rear wing; the Sián has scissor doors.
- Chassis functions: LEGO explicitly lists steering and front and rear suspension for the Sián. The official P1 description supplied for this comparison emphasizes its gearbox, engine, doors, and wing rather than a matching list of suspension functions.
Let availability decide only after the subject is right
The Sián’s 2020 release date helps explain why it may require a secondary-market search or a wait for restocking. LEGO’s page snapshot marked it sold out, but that status is a point-in-time storefront observation, not a prediction of future stock or resale value. The P1 appeared with an add-to-bag option in LEGO’s current US Technic catalog snapshot, making it the more straightforward official-channel candidate at the time checked.
McLaren P1 (42172): the gearbox-and-aero choice
What LEGO officially specifies
LEGO lists the McLaren P1 as an 18+ Technic set containing 3,893 pieces. The Fall 2024 US retail catalog describes a seven-speed gearbox with a shifter drum, a V8 piston engine, opening doors, and an adjustable rear wing. The current US Technic catalog snapshot displayed a $449.99 price and an add-to-bag option; the Fall 2024 catalog’s $449.99 figure is a historical US list-price reference, not a promise that every retailer or date will show the same amount.
Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesWhy those functions matter during a long build
A seven-speed gearbox gives the build a strong mechanical theme. The shifter drum is the indexing element that coordinates sequential gear selection, so builders who enjoy aligning shafts, selectors, and linkages may find the transmission more compelling than a model whose appeal is primarily exterior styling. The V8 pistons add a visible moving-engine payoff when the drivetrain is operated.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Opening doors turn the model from a static shell into an interactive display object. The adjustable rear wing adds another adjustment point: you can present the P1 in a cleaner parked configuration or with the aero element positioned differently. Those functions are official descriptions; there is no independent evidence here about how smooth, reliable, or difficult each mechanism is in practice.
Who should choose the P1
- Builders who specifically want a McLaren P1 rather than a Lamborghini.
- Anyone most interested in a seven-speed gearbox and shifter-drum mechanism.
- Displays where opening doors and an adjustable rear wing will be used as part of the presentation.
- Buyers who prefer an official LEGO storefront listing that showed an add-to-bag option when accessed.
Lamborghini Sián FKP 37 (42115): the V12-and-suspension choice
What LEGO officially specifies
LEGO identifies the Sián as an 18+ set with 3,696 pieces. Its official product page describes an eight-speed sequential transmission, a V12 engine with moving pistons, steering, front and rear suspension, and scissor doors. LEGO gives the completed model’s footprint as over 5 inches (13 centimeters) high, 23 inches (60 centimeters) long, and 9 inches (25 centimeters) wide.
The official instructions index identifies set 42115 as a 2020 release. That date is useful when evaluating listings: a sealed example, a used example, or a replacement-parts situation should not automatically be treated as equivalent to a currently stocked set.
PC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWhy these functions matter during a long build
The eight-speed sequential transmission is the Sián’s headline mechanical feature. Its sequential format is designed around ordered gear selection, while the V12’s moving pistons provide a visible engine action. Steering and both front and rear suspension give the chassis more explicitly listed moving systems than a purely body-focused display model.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Scissor doors are the distinctive display interaction. They open on an upward pivot rather than swinging conventionally, so allow clearance above the model when planning a shelf. LEGO’s dimensions make the Sián a substantial display: reserve at least the stated 23-by-9-inch length-and-width envelope, plus operating room for doors and access to the steering or transmission controls.
Who should choose the Sián
- Builders whose priority is the Lamborghini Sián design and V12 identity.
- Anyone who wants LEGO-listed steering, front suspension, and rear suspension in the same model.
- Displays where scissor-door operation is a central visual feature.
- Buyers prepared to check availability carefully because the LEGO US page snapshot showed the set sold out.
P1 versus Sián: mechanical comparison
| Decision point | McLaren P1 (42172) | Lamborghini Sián (42115) |
|---|---|---|
| Transmission | Seven-speed gearbox with shifter drum | Eight-speed sequential transmission |
| Engine | V8 piston engine | V12 engine with moving pistons |
| Steering and suspension named by LEGO | The supplied official feature description does not list these functions | Steering, front suspension, and rear suspension |
| Door design | Opening doors | Scissor doors |
| Other moving bodywork | Adjustable rear wing | The supplied official feature description does not list an adjustable rear wing |
| Age and pieces | 18+; 3,893 pieces | 18+; 3,696 pieces |
| Stated dimensions | The supplied official materials do not provide dimensions for this comparison | Over 5 in (13 cm) high, 23 in (60 cm) long, 9 in (25 cm) wide |
Neither column is an independent quality ranking. The table shows what LEGO says each set includes, allowing you to match functions to your own building priorities.
Display planning for adult builders
Measure the shelf before buying
The Sián’s official dimensions are large enough to rule out many shallow shelves: it is over 23 inches long and 9 inches wide. Measure the usable surface rather than the nominal shelf size, and leave room to reach the model without knocking adjacent objects. The supplied sources do not give a comparable P1 footprint, so do not assume both models require identical space.
Plan for moving features
Choose a display position that lets you demonstrate the feature you paid for. The P1 needs clearance around its opening doors and access to its adjustable rear wing. The Sián needs overhead and side clearance for scissor doors, as well as enough access to operate steering and inspect the suspension. If the model will be displayed behind glass, check door travel and shelf depth before final placement.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Decide whether interaction or preservation comes first
Interactive functions are most useful when the model remains reachable. A high shelf may protect the car from accidental contact but makes the gearbox, steering, doors, and wing harder to demonstrate. A lower, stable surface improves access but requires more care around dust, pets, children, and routine cleaning. These are display decisions rather than claims about model durability; the official sources do not provide long-term wear testing.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Availability, pricing, and listing checks
Read storefront prices as dated observations
The P1’s $449.99 figure appears in LEGO’s Fall 2024 US retail catalog and in the current US Technic catalog snapshot accessed for this guide. The Sián page snapshot also displayed $449.99, but marked the product sold out. Because one figure is tied to a 2024 catalog and the storefront statuses are volatile, treat both as dated US references. Taxes, shipping, regional pricing, promotions, and later price changes can alter the amount you actually pay.
Verify secondary-market Sián listings
For a 2020 set, ask the seller to identify 42115 exactly and state whether the box is sealed, opened, or incomplete. Request clear photographs of the box seals and major bags when condition matters. Confirm that the listing includes the building instructions or provide for an official replacement download through LEGO’s 42115 instructions page. Do not infer aftermarket value from LEGO’s sold-out label; the supplied official material contains no market-wide resale data.
Recheck the P1’s official status
The P1’s add-to-bag appearance was captured in a LEGO US catalog snapshot, not guaranteed inventory. Before checkout, confirm that the product page still identifies set 42172, that the displayed currency is appropriate for your region, and that shipping and return terms meet your needs.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Where the McLaren Formula 1 Race Car (42141) fits
The McLaren Formula 1 Race Car is a useful adjacent option for adult builders who actually want a single-seat race car. LEGO lists it as an 18+ model with 1,434 pieces and describes a V6 piston engine, steering, suspension, and a differential. LEGO’s official page marks it retired.
It should not be counted as a road-going supercar in a ranking of the P1 and Sián. Choose it for F1 subject matter and its race-car chassis functions, not as a substitute for the road-car bodywork and identity of the two supercar sets above. Its retired status also makes current availability a separate question from the P1-versus-Sián decision.
A practical buying checklist
- Choose the subject first. Decide whether the McLaren P1 or Lamborghini Sián is the car you want to look at for years; do not let a small piece-count difference make that decision for you.
- Match the mechanism to your interests. Select the P1 for the seven-speed gearbox, V8, opening doors, and adjustable wing; select the Sián for the eight-speed sequential transmission, V12, steering, suspension, and scissor doors.
- Check the exact set number. Confirm 42172 for the P1, 42115 for the Sián, or 42141 for the separate F1 race car.
- Check age and inventory. Both supercars are 18+ sets. For the Sián, account for its 2020 release and the sold-out LEGO snapshot; for the P1, recheck the current storefront rather than relying on an old catalog capture.
- Confirm the regional price. Treat the $449.99 figures as US observations tied to specific dates and pages, not universal current prices.
- Measure the display area. The Sián needs space for its stated 23-by-9-inch footprint and moving scissor doors. Obtain a current P1 dimension listing before committing to a tight shelf.
- Inspect condition when buying used. Ask about completeness, sorted bags, instructions, stickers, and box condition; a sealed, complete, or partially built set has different practical value.
- Plan replacement documentation. LEGO’s official instructions index provides a direct reference for the Sián if paper instructions are missing.
What the official evidence can—and cannot—tell you
The product pages and catalogs establish set identity, age rating, piece count, listed functions, one stated display size, dated prices, and LEGO’s storefront status at the time accessed. They do not establish an independently measured build time, comparative difficulty, long-term mechanism durability, market-wide price, resale value, or an objective “best overall” ranking.
Recommended Free Tools
That distinction matters for adult builders. A 3,893-piece model may demand more table space than a 3,696-piece model, but piece count alone does not reveal how repetitive the assembly feels or how precisely a gearbox must be aligned. Likewise, a sold-out page can reflect a temporary inventory state rather than permanent scarcity. Use the official specifications to narrow the choice, then base any condition or price judgment on the specific listing you can actually buy.
Final verdict
Choose the McLaren P1 (42172) if its car identity, seven-speed shifter-drum gearbox, V8 pistons, opening doors, and adjustable rear wing are the experiences you want—and especially if an official LEGO listing is available in your region. Choose the Lamborghini Sián FKP 37 (42115) if the V12, eight-speed sequential transmission, steering, suspension, and scissor doors matter more, while accepting that its 2020 release and recorded sold-out status may make acquisition less direct. Treat the McLaren Formula 1 Race Car (42141) as a separate retired race-car option, not a third road-going supercar contender.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
