in Vic the guide to modifications says that replacement steering wheels may not be less than 330mm. Of course if I build my Cobra from day one with a 300mm wheel then its not a replacement. In this case I'm going to assume the engineer will have the final say, as there is no ADR for steering wheel size ?
1MB PDF, "Guide to Modifications for Motor Vehicles"
http://www.vicroads.vic.gov.au/NR/rd...340/0/VSI8.pdf