Having some 'fun' with some aftermarket wheels. Got what is probably a dumb question but after an hour of trawling the web i'm no closer to working it out.
Basic problem is i'm concerned there's insufficient thread showing on wheel stud to put enough rotations on the wheel nut to secure the wheel.
Best guidance i've managed to find is that MSA regs state minimum rotations as "1.5x the diameter of the stud". What i'm not sure of is the stud diameter or what unit should be used to measure it for the multiplier.
Stud is M12x 1.5 (I think). I believe the 12 indicates a 12mm diameter? So what does the 1.5 mean? (Is it the multiplier for the head size (12x1.5=18mm head?) or something else? [Edit, further investigation done - I believe this may be the thread pitch so thread pitch is 1.5mm?]
If i'm right about the 12mm then number of nut rotations is 12x1.5 which is 18, which is too many to make any sense.
The alternative is i'm completely misunderstanding the whole thing and "1.5x the diameter of the stud" has nothing to do with the # of rotations and could refer to the length of stud that should protude from the wheel for solid engagement. So 18mm. In this case where how to measure this accurately?
If you hadnt guessed, i'm confused as fook so all help appreciated - i'm tired of spinning my nuts!