Hello! i found some pics of Derbi racing bikes and I think you'll like to see them.
The first I show you is a 1966 Derbi GP 50cc. The owner claims it develops 43hp, but I'm a bit esceptic about this enormous power. I think around 20-30hp is more reallistic, but of course, continues to be very impressive. At that time there was a 50cc World GP Championship and this bike ran in it with very good results. I must say that those GP racing Derbis are called "Balas Rojas"=Red bullets .