THE SCIENCE OF OFFSET
Understanding scrub radius, clearance, and how offset affects handling characteristics.

The RRT Deca Forged Wheel combines classic motorsport styling with modern forged wheel engineering. Built around a clean ten-spoke layout and a moderate lip profile, the Deca offers a balanced design that works exceptionally well with both modern and heritage-inspired vehicle builds.
Developed with optimized spoke geometry and structural efficiency in mind, this wheel delivers the durability expected from forged aluminum wheels while maintaining the visual simplicity enthusiasts appreciate.
The ten-spoke configuration of the RRT Deca Forged Wheel reflects design principles often associated with classic performance vehicles and JDM-inspired builds. The spoke layout distributes load efficiently while maintaining a clean appearance suitable for both aggressive and understated vehicle setups.
Subtle ribbed surfaces along the spoke sides enhance the visual depth of the wheel, emphasizing concavity even on modern vehicles that require higher offset rims for proper suspension clearance.
This design approach allows the wheel to maintain its traditional character while adapting to modern vehicle architecture.
Each RRT Deca Forged Wheel is produced using a high-strength forging process followed by precision CNC machining. This manufacturing method compresses the aluminum material to create forged aluminum wheels that are significantly stronger and more resilient than conventional cast alternatives.
Material is strategically removed from non-critical areas to reduce mass without compromising durability. This results in a wheel that maintains structural rigidity while functioning as one of the brand’s lightweight wheels.

The Deca is engineered to function as a performance-focused wheel by minimizing unnecessary weight. Lower wheel mass helps improve vehicle responsiveness in several areas:
• Quicker acceleration response
• More precise steering input
• Improved braking efficiency
• Reduced suspension strain
These benefits allow the RRT Deca Forged Wheel to deliver real performance improvements while maintaining its classic styling.
Modern performance vehicles often require higher wheel offsets to maintain correct suspension geometry. The Deca’s design accounts for this by using ribbed spoke surfaces and sculpted profiles that enhance visual depth even when higher offset rims are required.
This flexibility allows the wheel to integrate cleanly with modern brake systems, suspension setups, and wider tire configurations.
| kg | kg | kg | kg | kg | ||||||||||||||
| 17x7 | 7.05 | 18x8 | 7.85 | 19x8 | 8.25 | 20x9 | 8.75 | 21x9.5 | 10.45 | |||||||||
| 17x8 | 7.25 |
18x8.5 |
8 | 19x8.5 | 8.45 | 20x9.5 | 9.05 | 21x10 | 10.6 | |||||||||
| 17x9 | 7.45 | 18x9 | 8.2 | 19x9 | 8.6 | 20x10 | 9.35 | 21x10.5 | 10.8 | |||||||||
| 18x9.5 | 8.3 | 19x9.5 | 8.75 | 20x10.5 | 9.6 | 21x11 | 11.05 | |||||||||||
| 18x10 | 8.5 | 19x10 | 8.95 | 20x11 | 9.8 | 21x11.5 | 11.25 | |||||||||||
| 18x10.5 | 8.65 | 19x10.5 | 9.1 | 20x11.5 | 10 | 21x12 | 11.55 | |||||||||||
| 18x11 | 8.85 | 19x11 | 9.35 | 20x12 | 10.4 | 21x12.5 | 11.2 | |||||||||||
| 18x11.5 | 9.05 | 19x11.5 | 9.65 | 20/12.5 | 10.7 | |||||||||||||
| 19x12 | 9.95 |
Despite its clean and understated appearance, the RRT Deca Forged Wheel is engineered to meet the structural demands of spirited driving and track use. Like all RRT designs, it is developed with performance durability in mind.
The forged construction and reinforced spoke architecture allow the wheel to withstand high cornering loads, repeated braking stress, and demanding driving environments without sacrificing reliability.
This makes the Deca a strong choice for enthusiasts who want lightweight wheels capable of handling both daily driving and occasional track sessions.
The RRT Deca Forged Wheel maintains the spirit of classic performance wheels while offering modern customization options. Drivers can configure specifications and finishes to match their vehicle build and personal style.
Available options may include:
• Multiple wheel widths
• Various offset configurations
• Custom finishes and surface treatments
• Vehicle-specific bolt patterns
For drivers searching for new rims that combine heritage-inspired design with modern engineering, the Deca delivers a compelling balance of style and functionality.
Drivers choose the RRT Deca Forged Wheel because it delivers:
• Classic ten-spoke motorsport styling
• Durable forged aluminum wheels construction
• True performance through lightweight wheels engineering
• Compatibility with modern offset rims requirements
The result is a wheel that carries the inspiration of the past while performing confidently on today’s vehicles.
If you are researching wheels online and looking for a design that blends heritage styling with modern performance capability, the RRT Deca Forged Wheel offers a refined solution built with precision and durability in mind.
Every wheel in this series is forged and machined to tolerances that exceed conventional standards.
Aerospace-grade billet aluminum, heat-treated to T6 specification.
Five-axis CNC machining ensures micron-level precision on every surface.
T6 heat treat process maximizes strength-to-weight ratio.
Our forging process aligns grain structure for superior strength at a lower weight.
Up to 30% lighter than cast equivalents, reducing rotational mass.
Forged grain structure yields higher tensile and fatigue strength.
Dynamic balancing to within 5 grams for smooth high-speed rotation.
| Specification | RRT Forged | OEM Cast |
|---|---|---|
| Weight (19x8.5) | 50% Lighter / 15% Lighter JFW | 12.1 kg |
| Tensile Strength | ≥310 MPa | ≤220 MPa |
| Fatigue Life | 1,000,000+ cycles | ~500,000 cycles |
| Porosity | None | Visible micro-voids |
Each fitment is engineered to clear big brake kits and maintain optimal suspension geometry.
Precision-bored center bore matches your vehicle hub for vibration-free fitment.
Designed to clear multi-piston calipers without spacers.
Custom offset engineering for perfect flush fitment with the fender.
Each fitment is load-rated to exceed vehicle manufacturer specifications.
Deep-dive articles on the engineering behind the RRT Forged Weels.
Understanding scrub radius, clearance, and how offset affects handling characteristics.
Finite element analysis behind our signature I-beam spoke reinforcement design.
{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}