The following Bulletin was released last week in response to the shortage of suitable tyres for large cars on 15” diam wheels with 8” width. The important inclusion is the paragraph.
The use of a 225/50 aspect ratio tyre is permitted for use only when fitted to a 15 inch diameter x 8 inch wide rim. The tyre must be of a Make and Model currently nominated on the approved tyre list (below) for Group N and S. This will be permitted from 1 May 2012 to 31 December 2012 (inclusive).
The approval of these tyres will be reviewed during the specified period to see if suitable 60 aspect ratio tyres again become available. No doubt this will also open up the tyre debate again as well.