Help! Wheel lug stud loosened?
#1
Driver
Thread Starter
Help! Wheel lug stud loosened?
hi all, I need help recently drove from the mechanics and the had one of the studs on my car literally came off clean! And the lug nut was down the street on the floor. The upon looking for the stud we found it inside the disc brakes hub. When I brought it back to the shop immediately we found one of the stud missing and the rest of the stud loose to a point you can literally push the studs through the hub. We installed air suspension in and we were adjusting the preset heigh up and down couple of times before I drove off. Can anyone explain how this is even possible? I thought these lug studs are heavily torqued into the hub. How did all the rest of the 4 studs got loosen? that got me and my mechanic very confused of how that would even be possible. We retorqued all 5 studs into place and it's not as loose as it was before, but just trying to understand what happened.
#4
Driver
Thread Starter
i have a Vossen cv3 and don't think it needs a hub centric ring? The only thing is that we probably didn't torque it.. Is it possible that loose lug nuts can loosen the stud bolt like that? I didn't even get a 1/4 mile before hearing noise and realize one stud is missing and when we jacked the car to take the wheel off the are four we're loose and was able to be pushed the other side!
#5
Driver
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#8
Driver
Thread Starter
#9
I would definitely recommend investing in hub centeric rings with the Vossen wheels as they were not designed specifically for a IS-F the hub diameter is likely oversize. Also I would recommend make sure to check the wheels with a torque wrench.
#10
Instructor
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My theory is that because the wheels are not hubcentric, the lugs are doing most of the work. If there is any play with the lugs(loose) then the wheel will move in and out, up and down. this can cause the lug to be pushed back through the hub. This is only my theory though. Did you ever have any vibration with your wheels? Either that or the shop did something to them.
#11
Pole Position
My theory is that because the wheels are not hubcentric, the lugs are doing most of the work. If there is any play with the lugs(loose) then the wheel will move in and out, up and down. this can cause the lug to be pushed back through the hub. This is only my theory though. Did you ever have any vibration with your wheels? Either that or the shop did something to them.
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ptthere (03-17-22)
#12
Driver
Thread Starter
My theory is that because the wheels are not hubcentric, the lugs are doing most of the work. If there is any play with the lugs(loose) then the wheel will move in and out, up and down. this can cause the lug to be pushed back through the hub. This is only my theory though. Did you ever have any vibration with your wheels? Either that or the shop did something to them.
#13
Driver
Thread Starter
I have never seen something like this before but if you need locktite to keep you studs in place versus the press fit there might be an issue with the stud e or hub hole diameter.
Many people think this, but it is a myth that hubcentric rings help with the load on the tire. The friction fit between the wheel and the hub from the tightening torque on the bolts is the only thing that holds the wheel in place. Once the torque on the bolts is eliminated the wheel rests on the studs and wobbles and will eventually break the studs. The only point of the hubcentric ring is simply to aid in mounting, although this is minimized with tapered wheel lugs. I have never heard of studs getting loose until they actually fall out, this seems like a rare situation.
Many people think this, but it is a myth that hubcentric rings help with the load on the tire. The friction fit between the wheel and the hub from the tightening torque on the bolts is the only thing that holds the wheel in place. Once the torque on the bolts is eliminated the wheel rests on the studs and wobbles and will eventually break the studs. The only point of the hubcentric ring is simply to aid in mounting, although this is minimized with tapered wheel lugs. I have never heard of studs getting loose until they actually fall out, this seems like a rare situation.
#15
Tech Info Resource
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