They’re both "final exams" before mass production, so why do some suppliers breeze through R@R only to be forced into overnight rework by 2TP? If you work in automotive parts, two abbreviations inspire equal parts love and dread: R@R and 2TP . Newcomers often mix them up, thinking, "Isn’t it just running the production line before mass production? How different can it be?" Very different. I’ve seen too many suppliers apply their American R@R mindset to a German 2TP audit, only to get schooled by the auditor on the spot. Let’s break down exactly how these two systems work. 01 The Definition: What is R@R? Let’s correct a common misconception: R@R stands for Run @ Rate , not Ready for Ramp-up. While the ultimate goal is "production readiness," the name itself reveals the core logic—running at the required pace. American OEMs ( Ford , GM , etc.) want to verify your production claims. If you say your capacity is fine, prove it by running at the actual produ...