3R-2 Specifications

1. System Overview

2. Structural Architecture

2.1 Unified Structural Joint

The chassis uses one primary structural joint connecting the tower assembly to the base frame.

Joint Characteristics:
• Four M8 Grade 8.8 bolts
• Welded 6 mm steel interface plate
• Four FDFT M8 threaded ports
• No through‑bolts used anywhere in the system

This joint provides repeatable alignment and maintains rigidity equivalent to a welded connection.

2.2 Welded Frame Components

The following assemblies are fully welded:

• Base frame
• Seat rail structure
• Tower assembly

Tower Assembly Construction
• Uprights: 2″ × 1″ × 0.1″ HSS
• Crossbar: 2″ × 2″ × 0.1″ HSS
• Geometry: Unified welded arch
• Arm pivot welded directly to crossbar

This configuration creates a continuous load path from wheel deck to base frame, minimizing torsional and bending deflection under high‑torque steering loads.

3. Immersive Frame Resonance (IFR)

IFR is the chassis’ high‑bandwidth tactile conduction system.

The welded HSS structure preserves the full frequency range of:

• Direct Drive wheelbases
• Haptic exciters
• Pedal vibration systems

Key Properties:
• No friction‑joint damping
• No T‑nut slip or micro‑movement
• Continuous steel conduction path
• High‑frequency resonance preservation

Aluminum profile rigs introduce damping through friction‑based joints; the 3R‑2 does not.

4. Mechanical Performance

4.1 Rigidity and Deflection Control

The chassis is engineered for:

• Negligible horizontal sway
• Minimal vertical deflection under 30+ Nm steering torque
• Extremely low torsional creep under load
• Silent structural behavior (creaks, pops, joint slip)
• 500 lb static vertical load capacity

4.2 Motion‑Native Behavior

System Mass: 70 lbs
Design Logic: Low mass + high rigidity = reduced actuator latency.

The chassis supports high‑fidelity motion systems by minimizing inertia and eliminating structural flex that would otherwise absorb motion impulses.

5. Geometry & Ergonomics

5.1 Pedal Deck System

Five‑component assembly constructed from 3 mm folded steel.

Adjustments:
• 180 mm fore‑aft travel
• 20° tilt
• 508 mm clear mounting width
• Independent rail spacing

Components:

1. Left rail
2. Right rail
3. Fore and aft bridge rails
4. 152 mm × 508 mm heel plate on 25 mm standoffs

5.2 Wheel Arm Assembly

• 400 mm telescoping travel
• 25° arm tilt
• 30° wheel tilt
• Diamond‑rotated HSS interface designed to eliminate lateral and rotational play.

5.3 Seat System

• Supports bucket seats, automotive seats, office chairs
• Rail spacing range: 21 mm × 50 mm to 448 mm × 542 mm
• Tilt: 0–12°

5.4 Tower Arch Positioning

• 100 mm incremental positioning
• 400 mm total adjustment range

5.5 REST – Rapid Ergonomic State Transition (REST)

• Rapid ergonomic adjustments: <120 seconds
• Telescoping wheel arm adjusts without tools
• Seat and pedal adjustments require a 13 mm wrench
• No disassembly required
• Supports multiple driving ergonomics within the rig’s intended geometry

What this means
You can quickly change your driving position without taking the rig apart. The wheel arm moves by hand, while the seat and pedals adjust with a simple 13 mm wrench. Everything shifts fast and cleanly, letting you dial in your preferred driving posture in under two minutes.

6. Precision Telescoping System

6.1 Diamond‑Rotated HSS Arm

The telescoping arm uses a 45° rotated HSS profile.

Mechanical Characteristics:
• Self‑centering V‑block geometry
• Effectively no lateral play
• No rotational slop
• Extremely minimal micro‑flex under Direct Drive torque
• Rigid lock via M8 handle

This geometry is unique to the 3R‑2 and is a major contributor to IFR performance.

7. Compatibility

7.1 Wheelbase

• Universal plate
• 78.4 mm slot spacing
• Custom plates available

7.2 Pedals

• Fully slotted 508 mm rails
• Independent spacing
• Optional additional rails

7.3 Accessories

Extrusion rails supported for:
• Shifters
• Handbrakes
• Button boxes
• Keyboard trays
• Custom mounts ..and more

Extrusion is used only for non‑structural peripherals.

8. Manufacturing & Finish

8.1 Fabrication

• CNC‑cut steel
• Precision welding
• Friction‑drilled ports
• Form‑tapped threads
• Heavy‑wall HSS
• No through‑bolts

8.2 Finish

• Black semi‑gloss powder coat
• Azure Blue branding decals
• Optional accent colors

9. Quality Assurance & Assembly

9.1 QA

Each chassis is fully assembled before shipping to verify:

• Structural alignment
• Component fit
• Thread integrity

Warranty: Lifetime on structural components and threaded interfaces.

9.2 Shipping

• Single box
• 1200mm × 609mm × 203 mm – 48” x 24” x 8”
• 31.75 kg – 70 lbs

9.3 End‑User Assembly

Tools Required: 13 mm wrench
Assembly Time: <15 minutes

Procedure:

1. Remove 2 forward tower‑to‑rail bolts
2. Rotate tower on rear bolts
3. Align tower with front holes
4. Reinstall bolts
5. Torque

9.4 Warranty

Lifetime Structural Warranty
The 3R‑2 is built to last. We don’t expect structural or threaded failures to ever happen—but if they do, we’ve got your back. If a welded or threaded part ever fails, we’ll take care of it. Just get the part to us—we’ll repair it or replace it and make sure everything is right before it goes back to you.

10. Technical Comparison

Feature	3R‑2 (Unified Steel)	Aluminum Profile Rigs
Structural Architecture	Welded and bolted HSS steel frame	Modular T‑slot extrusion
Primary Joint Type	FDFT M8 structural threads	T‑nuts, corner brackets
Rigidity	High (fixed‑geometry load paths)	Variable (joint‑dependent)
Tactile Behavior	High bandwidth (IFR)	Damped by friction‑based joints
Motion Performance	Low inertia, low latency	Higher inertia, slower response
Deflection Under Load	Near zero	Noticeable at joints
Telescoping System	Diamond‑rotated, self-centering, self-seating HSS	Not typically available
Ergo Adjustability	<120 sec – 13mm Wrench	Minutes, requires tools
Setup Time	<15 min	Hours
Thread Strength	3× depth, structural	Shallow T‑nuts, risk of slip
Mechanical Noise	None (no joint creep)	Common (creaks, pops)
Accessory Mounting	Steel core + extrusion peripherals	Full extrusion
Long‑Term Stability	High (no joint loosening)	Requires periodic re‑torque
Weight	70 lb	100–200+ lb
Shipping	1 box, 70 lb	Multi‑box, heavy
Structural Integrity	Unified welded and bolted frame	Modular construction with joint instability

11. System Summary

The 3R‑2 is a welded steel sim racing chassis engineered for:

• High rigidity
• High tactile bandwidth (IFR)
• Low inertia
• Negligible deflection under load
• Rapid ergonomic transitions
• Industrial‑grade durability

The 3R‑2 is welded where structural certainty is required and bolted where modular adjustability is essential. Fixed‑geometry components such as the seat rail structure and tower arch are fully welded for maximum stiffness, while user‑adjustable interfaces — wheel, seat, and pedal mounting — use precision FDFT bolted connections for repeatable, tool‑friendly adjustment.

Its unified steel architecture, diamond‑rotated telescoping arm, and friction‑drilled structural threads differentiate it from modular aluminum systems, providing superior tactile clarity, structural certainty, and operational efficiency.