7.50 16 or 235 85 16

[gcc130]

[/quote]
Just see what size socket fits.
[/quote]

That's not definite, as they may be cross over nuts which use a 27mm socket but have imperial thread

[Alan Drover]

These are my wheel nuts. The one at 3 o'clock is a locking wheel nut.
The image needs to be turned clockwise through 90 degrees to get the correct definition.