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Old 10-06-2009, 10:47 AM
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That's a scary deal. I'm sure currie would never own up to it. Stick a set of arp or moser studs in the axle. Are you sure the wheel is seating on the axle flange?
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Old 10-06-2009, 10:58 AM
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The wheels are seated, everything looks fine! I am very suprised to see this. The car prob would have sheered the rest of the studs off if it was hammerd on one more time!
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Old 10-06-2009, 11:07 AM
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Are you getting 8 full turns on the lug nuts?
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Old 10-06-2009, 01:41 PM
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What size are the studs? I'm assuming 7/16" ?
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Old 10-06-2009, 02:23 PM
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Also, new aluminum wheels need to be torqued twice.. this same deal happened to my Fairlane when I put on the Vintage Wheel Works wheels (strange axles).
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Old 10-07-2009, 08:25 AM
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are the studs long enough? do you have at least one stud diameter threaded into the hex of the lug nut.
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Old 10-07-2009, 11:50 AM
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There are several possible reasons for breaking wheel studs, but usually it can be tracked to being either over-tightened, under-tightened, or not fully seated. As Steve pointed out, you need to retorque new aluminum wheels several times every 40-50 miles or so (unless it's being flogged, then more frequently) until they hold their torque values due to the conical seat on the lug nuts work hardening the conical taper of the seating surface on the wheel. I'm guessing it was torqued to spec for the wheel stud size when it left and then as the wheel material contacting the lug nuts yielded, the torque was lost. Once the studs are loose, they fail remarkably quickly and with minimal loading. Have you calibrated your torque wrench lately?

Too little thread engagement will usually lead to stripped wheel studs, not broken studs, but you do want at least 8 turns egagement as a general rule. It's possible that you received a bad batch of wheel studs, but not all that likely in my experience. Hydrogen embrittlement caused during zinc plating can compromise wheel studs, or any plated high-strength fasteners for that matter, but they're supposed be baked post-plating in order to release any captured hydrogen. If the wheel studs are not electro-plated, then that would rule out that possibility.

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