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.

 

Have you ever drove with the lug nuts loose? Do you have aftermarket wheels? Hubcentric rings?

 

The studs are pressed in - I have never heard of them coming loose. Good news is New studs are cheap.

Are they the stock studs?

 

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!

 

they are stock studs. Never in my life studs got loosen.

 

And still never.

Your stud didn't got loosen. Your stud got broken.

 

Were they over torqued with an impact?

Unless your vossens are custom fit for our hubs you'll need hub centric rings.

 

I checked all five studs in are broken, took it to a tire shop and they popped the studs out applied lock tight and everything went back on. Hopefully that doesn't happen again..

 

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.

 

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.

 

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.

 

no vibration of the wheel ever but I will look into a hubcentric ring though

 

very rare indeed, I think lifting it up and down to adjust height without torquing it was the problem, and when we were done we possibly forgot to torque the wheel.

 

What are the torque specs of the lug nuts?

 

76 lb-ft for the vast majority of Toyota and Lexus products.