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911SC '82
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Minimum safe thread length for wheel studs when adding spacers?
What is the minimum safe thread length for wheel studs when adding spacers?
I'm asking because the other day I changed the rear rotors and I wanted to add some H&R 14mm spacers I recently bought. These spacers come with 70mm long stud. 70mm is way too long to be able to fit them without removing the entire hub. maybe, I say maybe but I need confirmation, I could remove the parking brake gears to have lateral access but 70mm may be still too long Anyway, in the meantime, I measured the 70mm studs inserted in the old rotors with the 14mm spacer. I also fully screwed the lug nut entirely (~27mm), which leaves me 18mm to be filled by the wheel itself + the hub disc Does anyone know those values by any chance (wheel + hub disc)? how to calculate a safe stud length with Fuchs wheels? IF the current wheel bolt/studs are 45mm, adding a 14mm spacer, wouldn't require only a 50-58mm stud? those 10mm can help avoid removing the hub I think btw my rear wheels are original Fuchs 7Jx16 Last edited by francesconyc; 06-03-2024 at 07:22 AM.. |
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06-02-2024, 05:18 PM
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PCA Member since 1988
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General engineering rule of thumb is that the nut should thread onto the bolt/stud at least the diameter of the stud or bolt. E.g., if the bolt is 8mm in diameter, then the nut should engage at least 8mm of threads.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners. Cars are for driving. If you want art, get something you can hang on the wall! |
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06-02-2024, 11:12 PM
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banalytic
Join Date: Jun 2007
Location: Berlin, Germany
Posts: 76
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Or get an open steel lug nut - if this gets fully threaded on (stud fills nut completely), you're OK...
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06-03-2024, 12:52 AM
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911SC '82
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I can try with an open nut good point.
The closed classic 911 are very long, I measured 26mm of thread, but I counted 6 turns to reach 14mm of thread. i know is a bit of a strange topic, but I'm really trying to see if I can install some longer studs without pain. otherwise I will return them |
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06-03-2024, 07:21 AM
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