Classes

Machines are classified for racing according to chassis style, displacement, and nature of modifications.  In general, classes are defined to maximize competitiveness and maintain close racing.  Some classes have lower-cost entry points, and more or less forgiving characteristics than others.  Durability, cost of maintenance, and rider skill are all factors in the selection of bikes and classes.  The following list is a high-level description of each class.  Full descriptions are available in the Rule Book and the PSRA is happy to explain the differences!

Formula GP

Sport style frame.  Maximum 93cc single cylinder liquid cooled 2 stroke, 150cc single cylinder liquid cooled 4 stroke. 

Examples: RS125 (modified motor), TZ125 (modified motor)

Motard

Off road style frame.  Maximum 105cc single cylinder liquid cooled 2 stroke, 150cc single cylinder liquid cooled 4 stroke. 

Examples: YZ80, RM85, SX85, SX105, CR85, KX80, KX105, CRF150R

Formula Thunder

Off road style frame.  Maximum 65cc single cylinder 2 stroke liquid cooled, maximum 80cc single cylinder air cooled 2  stroke, maximum 125cc single cylinder liquid cooled 4 stroke, maximum 200cc single cylinder air cooled 4 stroke.  

Examples: KX65, YZ65, DRZ200, Grom125

Spec Thunder

Off road style frame.  All OEM, manufacturer components and engine must be stock.  Maximum 125cc single cylinder 4 stroke air cooled engines. 

Examples: TTR125, DRZ125, CRF100

Formula Supersport

Sport style frame.  Maximum 64cc single cylinder liquid cooled 2 stroke, maximum 80cc single cylinder air cooled 2 stroke, maximum 125cc liquid cooled 4 stroke.

Examples: CBR125, NSR50, NSF100, PreGP50, PreGP70

Spec Supersport

Sport style frame.  Maximum 50cc single cylinder liquid cooled 2 stroke or maximum 80cc single cylinder air cooled 2 stroke or maximum 125cc single cylinder air cooled 4 stroke.

Examples: NSR50, NSF100, PreGP50, PreGP70

Intermediate

Any Spec-class machine including the CBR125.

Examples: TTR125, NSR50, CBR125, CRF100

Youth

Machines are limited to a maximum of 50cc air cooled 2 stroke and maximum 70cc air cooled 4 stroke engines.

Examples: CRF50, DRZ70