This is what i found as far as rules:
2006 Class Structures
Premier1/2 Age: 15+
Weight: ICC @ 395, Moto @ 385
Fuel : Maxima 927 – Moto: VP C12, ICC: MS98
Formula V1/2
Age: 35+
Weight: ICC @ 415, Moto @ 405
Fuel: Maxima 927 – Moto: VP C12, ICC: MS98
Formula Spec1/2
Age: 14+ (under 15 must have 2 years prior race experience and approval of Race Director)
Weight: 385
Fuel: Maxima 927 – VP MS98, Maxima 927
TaG Senior
Age: 15+
Weight: Engine dependent – See Below
Fuel: Maxima 927 – VP MS98
Optional tire spec: MG Yellow, Bridgestone YGK, Bridgestone YHC, MoJo D1
TaG Master
Age: 35+
Weight: Engine dependent – See Below
Fuel: Maxima 927 – VP MS98
Optional tire spec: MG Yellow, Bridgestone YGK, Bridgestone YHC, MoJo D1
TaG Junior
Age: 12-15
Engine Restrictions: Per TaG USA rule book
Weight: 320lbs
Fuel: Maxima 927 – VP MS98
Optional tire spec: MG Yellow, Bridgestone YGK, Bridgestone YHC, MoJo D1
This is where i found them and some more details: http://www.prokartchallenge.com/forum/showthread.php?t=475