Circuito de Jerez – Ángel Nieto, is a 4.428 km racing circuit located close to the city of Jerez de la Frontera, 90-kilometre south of Seville and deep within the sherry-producing region in the south of Spain. From Wikipedia
The April 28 test at Circuito de Jerez saw teams evaluate chassis, engine, and aero updates, with Ducati withholding its GP25 package and Yamaha trialing a faster engine spec.
