Building your own ULTRA4Stock Modified, Stock,  Legends, or UTV? Find out all the rules before you start your build. All safety rules must be followed by all classes.

Download the ULTRA4 Rule Book. – Updated 12/29/2015 – updates are highlighted in RED.

Pro Comp Stock – 4600 , Rubicon Expess Modified – 4500 , G2 Wheels Legends – 4800  Classes: see sections 6.3 and 6.4 and 6.5 in the ULTRA4 Rule Book

UTV Drivers: Classes have been simplified one class.  Please consult the ULTRA4 2015 Rulebook section 6.6 for KOH UTV rules for KOH UTV Race.

Download the document “How to pass Ultra4 Chassis and Tech Inspection”

Ultra4 Chassis & Tech Sheet can be viewed here.

Should you have specific technical questions, please email our tech inspector at [email protected]