You assemble the SIMGASM Pro in nine clear steps: rubber feet, end plates, seat frame plates, uprights, shifter arm, pedal deck, brace plate, wheel mount and end caps. Every part, bolt and tool comes in the box, so you only need some floor space and a relaxed afternoon. The Pro is the flagship of the range, built on a 40 x 160 mm main profile, and a careful build is what turns that profile into a rig that feels like one solid piece.
Below we walk through each stage in plain words. You also learn why the order matters and which checks stop squeaks and flex later on.
What comes in the box with the Pro?
Before you start, it helps to know exactly what you have in front of you.
The box holds the aluminium profiles, the structural chassis brackets, the wheel mount you picked at checkout, all assembly hardware and tools, white assembly gloves, the assembly guide, the Apex side profile shifter and handbrake arm, a heel rest and rubber feet. The seat, seat slider, wheelbase, wheel, pedals, shifter, monitor stand and screen are not part of the cockpit. So plan those parts first, because they decide how you set up the rig at the end.
Prepare your space first
The finished Pro measures 580 x 1320 x 750 mm (W x L x H). Build it in the room where it stays, on a flat floor, with about one extra metre around it. Lay the profiles out per group and keep the T nuts in a small tray. The gloves are there for a reason: they keep fingerprints off a white or coloured finish while you work. If you want a full tool overview, read our guide on the tools you need to build an aluminium sim rig.
Step by step: building the base
The base is the foundation of everything, so this is where you take your time.
Feet, end plates and seat frame plates
First, fit the rubber feet to the bottom profiles. They protect your floor and stop the rig from walking under hard braking. Next, bolt the end plates to the ends of the base profiles. Then add the seat frame plates, which later carry your seat bracket set or seat slider. Leave all bolts snug but not fully tight at this stage. That way the frame settles square on the floor before you lock it down.
SIMGASM | Pro Aluminum Sim Racing Cockpit - Black
Uprights and the shifter arm
Now the uprights go on. These vertical profiles carry the wheel deck, so check that both sides sit at the same height. A tape measure is enough. After that, attach the included Apex side profile arm for your shifter or handbrake. It mounts on the side of the frame, so choose left or right now based on the hand you shift with. You move it later if you change your mind, but doing it right the first time saves work.
Pedal deck, brace plate and wheel mount
This part of the build decides how stiff the rig feels under your feet and hands.
Build and mount the pedal deck
Assemble the pedal deck on the floor first, then slide it onto the base. The Pro deck is rated for a braking load of 300 kg, which leaves a big margin for load cell and hydraulic pedals. One buyer wrote in his review that the deck feels really sturdy with zero flex, and that it adjusts in angle and height for a GT or Formula layout. Set a rough angle now and fine tune it once the seat is in.
Brace plate and wheel mount
The brace plate ties the front of the frame together and adds a lot of stiffness, so never skip it. Then configure the wheel mount you ordered: Bottom Mount, Front Mount, Side Mount or the Asetek Front Mount. Each one fits specific brands, so check the model table on the product page before you bolt your wheelbase on. Our guide on bottom, front and side wheel mounts explains the differences in detail.
SIMGASM | Pro Aluminum Sim Racing Cockpit - White
Final checks before your first drive
A few minutes of checking now prevents hours of chasing small noises later.
Square, tighten and set your position
Fit the end caps for a clean finish. Then measure the diagonals of the base: when both match, the frame is square. Now tighten every bolt in a cross pattern, from the base up to the wheel deck. Next, set your driving position in this order: pedal deck angle, then seat distance, then wheel height and angle. Our article on a GT or Formula position on a Pro sim racing cockpit goes deeper into that last step.
After your first two or three sessions, check all bolts again. Aluminium profiles settle a little once they carry real load. A second round of tightening keeps the rig silent for years.
SIMGASM | Pro Aluminum Sim Racing Cockpit - Silver
Why the Pro is built this way
The build steps make more sense once you know the thinking behind the design.
SIMGASM founder Johan Akkerman has raced since 2008 and won the 2019 Project CARS 2 world team championship. Before SIMGASM, he tested and helped develop the TRX chassis at Trak Racer. That experience shows in the Pro: steel reinforcement sits at the critical mounting points, cable passthroughs are integrated and the frame is ready for motion. Every SIMGASM product is also tested as part of a complete simulator, not as a loose part. So when you follow the build order, you get the same stiff platform that SIMGASM designed and tested as one complete simulator.
Ready to pick your colour? Browse the SIMGASM Pro sim racing cockpit range, or compare it with the smaller sibling in our guide on assembling the SIMGASM Sport.
Questions about building the SIMGASM Pro
These are the questions we hear most from first time Pro builders.
How long does the Pro take to build?
SIMGASM's own assembly guide for the Sport puts a first aluminium rig at around two hours. Plan a little extra time for the bigger Pro profiles.
Do you need extra tools?
No. The tools and all hardware come in the box. A tape measure and a tray for the T nuts make the job easier.
Is the seat included?
No. The seat and seat slider are sold separately, so you choose the seat that fits your driving style.
Which wheel mount do you need?
That depends on your wheelbase. Check the model table on the product page, or ask the SIMGASM team at hello@simgasm.com.
Want to learn more? The SIMGASM experts are happy to help.
