le document officiel 2009 est là:
http://www.fim-live.com/fileadmin/al...ING_GP_Eng.pdf
p.47 §2.5.1
The following are the minimum weights permitted:
– 125cc motorcycle + rider 136 kg
– 250cc 1 cylinder motorcycle 100 kg
2 cylinders motorcycle 100 kg
– MotoGP 2 cylinders or less motorcycle 133 kg
3 cylinders motorcycle 140,5 kg
4 cylinders motorcycle 148 kg
5 cylinders motorcycle 155,5 kg
6 cylinders or more motorcycle 163 kg