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From my post over at PPBB...
The reason torque values are specified on wheel bolts is not to keep the wheel snug against the hub. The specified torque is applied to the bolt in order to establish an axial preload that will not be overcome by fluctuations in the load appled to the bolt due to external forces. Load reversal leads to fatigue failure, hence the desire to prevent load reversal. The reason this may not be important in a stock car race is that the axial loads on the bolts don't change that much or often during the course of a race. Load fluxuation in a road car is much more dramatic and happens with a much greater frequency. Hence the desire to establish the correct preload (torque) on the wheel bolts.
(Edited to remove the sarcasm)
CW
__________________
"Lotta people go through life doing things badly.
Racing's important to men who do it well.
When you're racing, it's life.
Anything that happens before or after is just waiting."
-M. Delaney (Steve McQueen, "Le Mans")
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