40x160 vs Other Aluminum Profile Sizes for Sim Rigs: A Comparison

Quick answer

For most direct drive wheel users, 40x160 aluminum profile is the safest choice for the main uprights and wheel deck because it resists flex without adding excessive bulk. If you run a compact formula-style rig or have limited floor space, 40x120 or 40x80 profiles are often sufficient and easier to live with. The right size depends on your wheel torque, rig layout, and how much adjustability you want.

Aluminum profile size is one of the most confusing specs when you are shopping for a sim racing rig. The numbers like 40x160 and 40x120 refer to the width and height of the extrusion in millimeters, and they directly affect how stiff your rig feels under heavy braking and high-torque wheel feedback.

This comparison looks at 40x160, 40x120, and 40x80 profiles using real SimXPro rigs as examples. You will see where each size makes sense, what you give up when you go smaller, and how to match profile size to your wheel base, pedals, and room.

What the profile numbers actually mean

A 40x160 profile is 40 mm wide and 160 mm tall. The 160 mm dimension runs vertically or horizontally depending on how you orient it, and that depth is what resists bending. A 40x120 profile is 40 mm wide and 120 mm tall, so it is lighter and narrower but less resistant to flex. A 40x80 profile is 40 mm wide and 80 mm tall, the smallest of the three and the most common entry point for compact rigs.

All three sizes use the same 8 mm T-slot system, so brackets, dampers, and mounts designed for one size generally fit the others. The difference is not compatibility but stiffness and footprint. Taller profiles give you more material away from the neutral axis, which is why a 40x160 upright feels noticeably more solid than a 40x80 one when you push against it.

• Measure your available floor space before choosing a profile size; a 40x160 rig can be deeper than a 40x80 rig with the same layout.
• Check that your existing brackets and mounts are for 8 mm slots, not 6 mm, before mixing profile sizes.

40x160 vs 40x120 vs 40x80: stiffness and weight

Stiffness scales with the height of the profile, not just the width. A 40x160 extrusion is roughly twice as tall as a 40x80, which makes it far more resistant to the twisting forces a direct drive wheel base sends through the rig. A 40x120 sits in the middle: it is stiffer than 40x80 but lighter and less bulky than 40x160.

Weight matters too. A full rig built from 40x160 profiles can weigh significantly more than the same layout in 40x80, which makes it harder to move alone but also helps damp vibrations. If you plan to reposition your rig often, the lighter 40x80 or 40x120 options are easier to handle.

• Direct drive wheels with high torque benefit most from 40x160 uprights and wheel decks.
• If you use a belt-driven or entry-level direct drive wheel, 40x120 or 40x80 may be enough.

Real rig examples: how SimXPro uses these profiles

The SimXPro R80 Sim Racing Cockpit Silver is built from 40x80 aluminum profiles. It is designed as a compact, rigid, ready-to-race entry rig with a small footprint for home setups. That makes it a good match for modest wheel bases and tighter rooms, but it is not intended to be the stiffest option for high-torque direct drive systems.

The SimXPro X80 + Extended 58 cm Shifter Profile Bundle uses the X80 cockpit, which is a step up in profile size and includes an extended shifter mounting profile for a more flexible shifter and handbrake position. If you want a formula-style driving position, the SimXPro FR-DD + Integrated Single Monitor Mount Bundle pairs the FR-DD cockpit with an integrated monitor mount, and the FR-DD is built for a compact formula layout rather than a wide GT posture.

• The R80's 40x80 profiles keep the rig light and compact, which suits smaller spaces and lighter wheel bases.
• The X80 bundle adds a 58 cm shifter profile, so you can place your shifter and handbrake where they are easiest to reach.

How to choose the right profile size for your setup

Start with your wheel base. A high-torque direct drive wheel pushes and pulls the rig with enough force that flex becomes visible and distracting. For those, prioritize 40x160 for the main uprights and wheel deck, or at least 40x120 if space is tight. For belt-driven or lower-torque direct drive wheels, 40x80 can work well, especially in a compact rig like the R80.

Next, consider your pedals. Load cell pedals require a stiff pedal deck because you are pushing against them with significant force. A rig with 40x160 base profiles and a reinforced pedal deck will feel more consistent than a lighter 40x80 frame. Finally, think about adjustability: taller profiles give you more room to slide mounts and brackets, while smaller profiles limit how much you can fine-tune positions.

• Match profile size to wheel torque first, then pedal force, then available space.
• If you are unsure, 40x120 is a practical middle ground for many home rigs.

Trade-offs at a glance

• 40x160 profile: Maximum stiffness and resistance to flex, best for high-torque direct drive wheels and load cell pedals. Heavier and takes up more space than smaller profiles. Choose 40x160 if rigidity is your top priority and you have room for a larger rig.
• 40x120 profile: A middle ground that is stiffer than 40x80 but lighter and more compact than 40x160. Works well for many direct drive wheels and home setups. Choose 40x120 if you want a balance of stiffness, weight, and footprint.
• 40x80 profile: Light, compact, and affordable, as used in the SimXPro R80. Less resistant to flex under strong force, so it suits lower-torque wheels and tighter spaces. Choose 40x80 if space and weight matter more than maximum rigidity.

Product facts

• SimXPro R80 Sim Racing Cockpit Silver: Compact, rigid, ready to race. The SimXPro R80 is an affordable aluminium profile sim racing cockpit designed as a clean, reliable entry into sim racing, with a compact footprint for home setups. Built from high quality 40x80 aluminium profiles. The 40x80 profiles keep the R80 light and space-efficient, which is ideal for smaller rooms and lighter wheel bases, but it may flex more under a high-torque direct drive wheel.
• SimXPro X80 + Extended 58 cm Shifter Profile Bundle: The black SimXPro X80 with standard pedal deck, bundled with the extended 58 cm shifter mounting profile for a more flexible shifter and handbrake position. Seat, seat mounting hardware, controls and monitor mount are not included. The X80 uses a larger profile than the R80, giving you more rigidity for stronger wheel bases, and the extended shifter profile lets you position your shifter and handbrake exactly where you want them.
• SimXPro FR-DD + Integrated Single Monitor Mount Bundle: Combine the compact Formula driving position of the SimXPro FR-DD with the black SimXPro Single Integrated Monitor Mount. Includes SimXPro FR-DD Formula Sim Racing Cockpit and SimXPro Single Integrated Monitor Mount 75/100 VESA — Black. Seat, steering hardware and monitor are not included. The FR-DD is designed for a compact formula driving position, which often uses a different profile layout than a GT rig. This bundle gives you a complete mounting solution for a single monitor without buying separate parts.
• SimXPro 4x Rubber Dampers M8: A small part that makes a big difference. This mounting hardware helps you assemble, adjust and fine tune an aluminium profile cockpit. Ideal for cockpit assembly and quick adjustments. Compatible with common aluminium profile slot systems. Helps keep your rig tight and rattle free. Rubber dampers reduce vibration and rattles that can make even a stiff 40x160 rig feel loose, and they work with any of the profile sizes discussed here.

Who should choose which

Best for

• Racers with high-torque direct drive wheel bases who want minimal flex
• Drivers using load cell pedals who need a solid pedal deck
• Anyone with enough floor space for a larger, heavier rig

Not for

• Small rooms or apartments where a compact footprint is essential
• Racers who frequently move or store their rig and need something lightweight
• Budget-focused buyers who do not need maximum rigidity

There is no single best profile size for every sim rig. Match the extrusion to your wheel torque, pedal force, and available space: 40x160 for maximum rigidity, 40x120 for a balanced middle ground, and 40x80 for compact, lighter setups. Use the rigs and parts mentioned here as real examples, and add rubber dampers to keep whichever size you choose tight and rattle-free.