Key to Classes Codes
First letter is Engine location in car chassis.
Second letter is which end of car has the driving wheels.
Third letter refers to tire traction devices.
No letter for nothing (bare rubber)
S=Studs (standard commercial)
B=Bolts (such as 1/4x20 protruding from tires) or screws inserted in tires.
Fourth (or third if no traction devices) letter (number) is to break up above classes into subclasses. 3 "similar" cars can make their own class if the class they leave still has 3 cars in it when they leave.
1, 2, 3, 4, etc…
4WD=four wheel drive vehicles. To this we add the traction letter above.
DB=Dune Buggy type vehicles. Add traction letter if applicable.
BD=Barber Dodge formula car class. Probably with bolts.
If it seems reasonable, we can have Rallycross classes, defined by the Rallycross group.
RC(then 2-3 configuration letters above)1, RCxxx2, RCxxx3, RCxxx4, etc..
No tire chains are allowed in competition.