GP 250/SSP 400

( Class 1 )   until 250ccm 2Strokes -- until 400ccm 4Strokes 4Valves -- until 900ccm 4Strokes 2Valves -- Single cylinder

SSP =

SuperSport

( Class 2 )  until 636ccm 4Strockes 4cylinders -- until 750ccm 4Strockes  2cylinders -- until 500ccm 2Strockes

R6, CBR 600, ZX 6, GSX R 600, Ducati 748, 749

SBK =

SuperBike

( Class 3 )   until 750ccm 4Strokes 4cylinders -- until 1000ccm 4Strokes  2cylinders

Ducati 916-999, Aprilia Mille, TL 1000, VTR-SP1, GSX R 750, ZXR 750

STK =

StockSport

( Class 4 )  over 750ccm 4Strokes 4cylinders -- over 1000ccm 4Strokes  2cylinders

R1, CBR 900, ZX 9, GSX R 1000, Ducati 1098