RT-S S81 Series Wheel 18x5 5x4.5 BC 2.1 BS

The RT-S S81 Series Wheel 18x5 5x4.5 BC 2.1 BS by WELD RACING is purpose-built for serious street and track enthusiasts who demand lightweight strength without compromise. This 18-inch wheel is engineered for vehicles requiring a 5x4.5 bolt pattern, delivering the minimal unsprung weight that transforms handling response and acceleration. Whether you're building a high-performance street machine or prepping for weekend track duty, this wheel provides the rigid foundation every suspension upgrade and brake upgrade depends on.

The RT-S S81 Series features a 2.1-inch backspacing and 5-inch width, making it ideal for classic muscle cars, vintage performance platforms, and modern restomods where fitment geometry matters. At 23.7 pounds per wheel, WELD RACING's construction methodology prioritizes rotational inertia reduction—critical for any build targeting quicker acceleration and easier braking modulation. The 18x5 proportions preserve sidewall flex for tire grip while allowing full suspension articulation, whether running DOT street rubber or dedicated track compound. The centered design eliminates the need for spacers on properly set-up suspension geometry.

Buyers restoring or modifying Chevelle, Camaro, Firebird, and similar Chevrolet platforms from the muscle-car era will find this wheel indispensable, as will owners of early Ford and Mopar vehicles with matching bolt patterns. The lightweight construction directly improves fuel economy during street use and sharpens response during spirited driving. Installation requires standard 5x4.5 lug nuts and torque specifications per your vehicle's service manual. For maximum performance, pair these wheels with quality suspension components, proper wheel alignment, and tire sizes matched to your vehicle's weight distribution and power output.