Key to Classes Codes
First letter is Engine location in car chassis.
F=Front, R=Rear
Second letter is which end of car has the driving wheels.
F=Front, R=Rear
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.