| changing steel wheels to alum [message #184424] |
Fri, 14 September 2012 09:06  |
C Boyd
Messages: 2629
Registered: April 2006
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Senior Member |
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I am currently in a discussion about how many threads are allowed by DOT to show after tightening. It is centered on replacing front steel wheels on a big truck with Alcoas. This particular truck has the cone shaped lug nuts and tapered holes and are lug centered but the same discussion also covers changing the hub centered wheels also with the flat washers attached to the nut. The issue; is the stud long enough if there are 2-3 threads showing after installation. Trucks that come from the factory with Alcoas do have longer studs and probably have 1/2" stud showing. The tire store that this newbie uses says he needs longer ($500) studs to meet DOT requirements. I have ran Alcoas on the big trucks with short studs for 15 years with no issues. I did have them covered with nut covers and have been thru MANY spot DOT checks and have passed without asking me to remove a nut cover to check? I believe that 2-3 threads showing is safe from experience. Google DOT did not help. Alcoa says to use the longer studs and special Alcoa lugnuts on the hub centered wheels but no info on the tapered wheels as they are basicly obsolete.
Anybody know what the DOT requirements are??
C. Boyd
76 Crestmont
East Tennessee
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