What about wet testing? If the weather isn't cooperative, in-ground sprinklers can soak a half-mile circuit on demand. "The track was designed to do exactly what it does and that's test tires' performance," Danny Roberts, Dunlop's test manager, says. Performance testing doesn't just entail lap times, lean angle, and courage. It also means ensuring the tires still perform acceptably when a bike is loaded to capacity, when the tires are worn, or when brands are mismatched. "You can't test for every scenario, but we try," he adds.