Wheel and tire requirements applicable to all Ultra4 competition vehicles.
Section 2.18 • Common Vehicle Requirements
2.18.1
All vehicles shall have exactly four driven wheels, each with exactly one tire.
2.18.2
Snap-on hubcaps or snap-on wheel covers of any type are not permitted.
2.18.3
All factory-built tires from any manufacturer are permitted.
2.18.4
Tires shall be visually checked for condition and must not be considered obviously unsafe by the Chief Technical Inspector.
2.18.5
Tire studs, screws or any other items added to the tire are not permitted. Grooving, sipping or other modifications that involve removing material from the tire are permitted.
2.18.6
Secondary Inflation Apparatus that retains the profile of the tire in the event of a puncture will not be allowed. Tire Liner type products with a functional outer diameter of no more than 27” will be allowed. Vehicles can and will be tested at any time. First time offense, disqualification from the race. Second time, season long suspension. Central tire inflation systems are allowable.
2.18.7
The requirement for DOT Street Legal tires in the limited classes is implied for all race compound ‘sticky’ tires regardless of their DOT Stamp. For example the Competition Maxxis Trepadors that have a DOT Stamp. DOT / road legal tire classes are restricted to tires that are intended for highway use and are available to the general public as part of a multiple line of tire sizes within the design.
2.18.8
Soaking tires or chemical modification in the DOT / road legal classes will not be allowed.
2.18.9
Durometer testing to confirm that tires conform to other tires in the DOT / road legal classes within 5% will be conducted.
