Designed for professional racing teams competing in the United Sportscar CTSCC Grand Sport (GS) class, the Forgeline GS1R combines the latest in advanced wheel technology, including one piece forged monoblock construction, motorsport engineered design, and I-beamed spokes. This wheel is engineered to withstand the rigors of top-level endurance racing with a 2100 lb street tire load rating and exceptional deflection stiffness.
Though made from the same forgings and similar design as our GA1R street wheel, the GS1R has even more material machined from the center area for additional weight reduction and improved access to the lugs. In combination with a new chamfered outer lip (with fewer sharp edges for easier handling), this enables faster wheel changes and, depending on size and offset, can save an additional pound of mass from each wheel!
The GS1R is machined from a single forging of 6061-T6 aluminum. It is currently available only in 18-inch diameters with a range of widths and offsets. (Please Note: Some vehicle-specific fitments are listed below. Custom offsets are also available.) And just like any Forgeline wheel, the GS1R is available with fully customizable finish options.
Note: This wheel will NOT accept a center cap. Intended for race use only.
- One-Piece Monoblock Design
- I-Beamed Spoke Technology
- 2100 lb. Street-Tire Load Rating (per wheel)
- Lightweight - Up to One Pound Lighter Than the Standard GA1R
- Open Lug center will NOT accept a center cap. Recommended for track use only.
- Customizable Finish Options
Forgeline Motorsports manufactures the world's finest custom-made high-performance lightweight forged aluminum street and racing wheels for the most discerning enthusiasts and the most demanding applications.
For over 20 years, we have applied our racing experience and passion for motorsports toward designing and building wheels that can withstand the extreme demands of sports car racing. With an unwavering commitment to strength and safety, we have earned a spot on some of the world's fastest race cars including those in Grand-Am, American LeMans, SCCA Pro Racing, and virtually every amateur racing series in America.
Every Forgeline wheel is engineered using computer-simulated finite element analysis and tested beyond SAE standards using real-world load variables to ensure strength, safety, and performance. Innovative features like I-beamed spokes, hidden titanium ARP fasteners, meticulously-engineered centers, and complex manufacturing techniques (like those found in our flagship three-piece competition wheel, the GA3R) ensure that Forgeline wheels are strong, fast, and stunning.
Forgeline wheels are machined from heat-treated 6061-T6 aluminum that is forged on a 6000-ton hydraulic press. This forging process aligns the grain structure, reduces porosity, and increases uniformity in the material, creating the highest strength-to-weight ratios and the most consistent quality. On average, our forgings are 40% stronger than cast aluminum.
Forgeline's own in-house manufacturing and engineering capabilities also provide unmatched flexibility when it comes to vehicle fitments, wheel sizing, and custom finish options. Whether you need a wheel that is specially-built to accommodate your unique suspension and brake package, or you just want a custom color combination to express your own individual personality, Forgeline can get it done! We can even build completely original one-off wheel designs for prototypes, show cars, and creative enthusiasts who wish to have a truly original wheel.
And Forgeline's legendary quality and customer service is unmatched. The experience, dedication, and personal involvement of our hands-on company owner and our entire team of employees ensure that every Forgeline customer is confidently investing in quality, strength, durability, and performance with every purchase.
