GP-50A, GP-50 and GP-70 MiniGP motorcycles are manufactured by ASR (A. Sieber Racing), an independent manufacturer located in Europe.
Production started in 2002. The first success came in 2004 when the bikes took the British championship. And also first place in 2005 and 2006 Czech Mini Road Racing championships.
Since 2005 there was a new cup set up in England just for these motorcycles.