All you have to do is look it up and read
SCTA web site, El Mirage procedures, page 8, section IV Vehicle inspection,
D. Wheels:
The use of non-pneumatic wheels/tire combinations (i.e.; aluminum, composite, etc. wheels) requires
a variance and review by the Technical committee and board approval before use. These wheels must demonstrate through a review process that they do not adversely affect the race surface. Vehicle structure must be inspected after three runs. Future use of these wheels may be disallowed at any
time if they are deemed detrimental to the racing surface.