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Cone versus flange nuts and aluminum wheel thickness are the governing factors for torquing. Over-torquing with the cone nuts can actually displace aluminum and cause cracking of the wheel from the bolt hole to the center hole. Flange nuts can be torqued to a higher degree because they are simply clamping on the outer surface of the wheel without the tendancy to displace or stress the bolt hole.
Something to remember: DO NOT lube the bolts or nuts as this radically distorts any torque reading you will get. Wheel studs and their nuts must be dry and lube free. Cleaning studs with a wire brush and the nuts with one of those plumbers wire brushes used for soldering fittings is all that is needed from time to time.
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Sandra, Bruce
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