Absolutely the best  Front Sprockets avalable. UK Made. Spline fitment is 13 tooth, 21.7mm X 25mm. This Sprocket will fit the Kawasaki Z650/750/900/1000 , GS550/750/1000 , GSX750/1100 . GSXR750/1100 85-98 , GSF1200/600 Bandit 530 chain Pitch.hayabusa gen1 and GSXR1000 01-08