to pay Rotax "an eight-figure sum" for the 1,125 cc engine contract. Erik Buell later founded Erik Buell Racing to provide support for 1125 and XB privateer race efforts. On Thursday, February 18, 2021 Buell Motorcycles announced they are back in production under new ownership with additional models in development. Their models include the Hammerhead 1190RX, 1190SX Carbon Fiber, Super Touring 1190, and 1190HCR. Technology Buell XB models also incorporated the industry's first Zero Torsional Load (ZTL) perimeter floating front disc brake system, a patented "inside-out" wheel/brake design that puts the brake disc on the outer edge of the wheel, rather than at the hub. This lets the suspension function better, improving control and traction, through reducing unsprung weight on the front wheel, because only a single disc and caliper—with a corresponding reduction in bolts and brake fluid—is needed compared with the conventional dual-disc brake setup on most modern sport bikes. In an exchange in the pages of Motorcyclist magazine between Suzuki engineer James Parker, creator of the GSX-RADD hub-center steering system, and Buell's Director of Analysis, Test & Engineering Process, Abraham Askenazi, Parker conceded the ZTL system's advantage in unsprung weight. But he pointed out the remaining weight is located further out on the rim where it is most detrimental to acceleration and braking, and that there were potential heat transfer issues, and the need for one fork leg to be stronger than the other. Responding, Askenazi disputed all of Parker's criticisms, saying the ZTL system was 30% lighter than the brakes on the Suzuki GSX-R1000, and that the inertia of having the weight further out on the rim, and the heat generation near the tire, were not negative factors, based on testing. Askenazi concluded that testing and race track experience had proven the ZTL to be "state of the art." Other industry innovations introduced by Buell in the XB lineup were the "fuel in frame" technology, and the dual use of the swingarm as an oil tank. Also, all Buell models have a muffler mounted below the engine which helps keep mass centralized with some models featuring a computer-controlled valve to switch between two exhaust paths as necessary to maximize torque. Buell designs focus on providing good handling, comfortable riding, easy maintenance, and street-friendly real-world performance. Buell motorcycles were engineered with an emphasis on what they called the "Trilogy of Tech": mass centralization, low unsprung weight, and frame