Group ND Proposal
Wheels maybe increased in diameter by 2 inches
Wheel design and construction must be compatible with the PERIOD save that magnesium construction and/or centre lock single nut arrangements are prohibited
Maximum permitted rim width:
- Class A and B Maximum 8 inches
- Class C, D and E Maximum 7 inches
- Class F and G Maximum 6 inches
Wheel nave plates or covers must be removed
Any wheel to hub spacers used must be securely fitted, not slip on
Justification and Rationale
Simplification in line with ever increasing size of wheels found on production cars in the PERIOD
The prohibition on magnesium and centre lock wheel is to cap costs and increase safety in an amateur sport.
Note: Allowing a maximum of 2 Inch increase will permit drivers to upsize to a rim/tyre combination where race tyres are available, 14" and 16" rims are common on ND era cars and race tyres are already obsolete for most common brands.