[Torbjorn968]

Read some interresting basics by a race engineer in the British "Track and Race Cars" regarding torque to be applied to wheel nuts.



The argument was this: do not overtighten, it might mean breakage to the bolt which is quick and catastrophic. If you loose a nut or 2 you will probably notice in time.



Alloy expands more in heat than SS which means that the wheel is in effect tightened as you heat it up, especially on the race track.



If you add a cold wheel mounted at an endurance event this is a recepie for even larger headaces: the steel has already expanded and as the to cold wheel expands the heat expansion tightens the nut even more.



The engineer reported that the fact that bad habits regarding this has developed might be a reason for more lost wheels in the UK.



//TL

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[xrad]

Might seem different, but I always put a smear of marine grease on all studs and between disc hat and alloy rim. Torque more easily to spec and come off much more easily(never had one loosen up even on the track)

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[968rz]

I small tab of anti-seize on in the nut and some on the rotor hat to avoid the rim sticking and torque to 95ft/lbs, never an issue.

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[Eric_K]

You see this a lot in endurance racing where someone uses an air gun with the pressure too high and working too fast. I have seen more than one car leave with a lug and chunk of stud left behind.

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[S_Cal968]

Another issue is stretching the stud which shortens the life. And since this is one of those really critical things, I always use a torque wrench on all my cars.

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