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2Addicts | BMW 2-Series forum Technical Topics Tracking / Autocrossing Wheel Lug Bolts are a wear item

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      10-10-2019, 03:29 PM   #1
Maynard
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Wheel Lug Bolts are a wear item

Passing along a warning from the last HPDE I attended. They recently had somebody who lost a wheel from lug bolt failure (on track - OUCH), and the techs were reminding us of something that wasn't really news to me, but not something I see mentioned often. Wheel lug bolts are being stretched each time they are torqued, and they will eventually fail; Tracking leads to a whole lot more of this than the factories plan for, and the damage is greatly magnified if you've had a gun-monkey put your wheels on with too much torque. They are recommending replacement every 2-3 years (I think this is similar to what they suggest for wheel studs too). And if nothing else, it makes for a great excuse to replace those junky looking lugs with nice new ones that match the wheels.
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      10-10-2019, 03:36 PM   #2
ScottSinger
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That really is interesting.
When they fail do the heads pop off ?
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      10-10-2019, 05:00 PM   #3
Maynard
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I didn't get that much detail. They said that the bolts sheared off, but I DK if they lost the heads, or sheared off at the hub surface. I suspect that the first one would fail in it's own way, based upon the stretch-fatigue; then the remaining ones would be affected by the increased load and movement, so they would potentially have a very different pattern.
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      10-11-2019, 10:12 PM   #4
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Yes, bolts and studs definitely are wear items. I've had a few individual studs snap, but usually caught them on time. This summer, I didn't and had a wheel detach going ~90 through T9 at Big Willow. Actually got pretty lucky that it snapped close to the apex with most of the direction change done:



I've asked the local race shops around after this and most of the mounting hardware advice boils down to:
- replace them. I've heard every 25-30 track days, maybe more often if you do lots of wheel changes;
- if a single one snaps, replace all of them on that corner;
- check your torque wrench, 20-30% errors are apparently not uncommon on cheap ones;
- don't torque them when the hub is hot;
- don't click the wrench multiple times "just to make sure".

Anyway, I got away just a bunch of front suspension and bodywork damage. Which was a convenient excuse for some Very Wide changes:
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      10-13-2019, 08:13 PM   #5
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OEM bolts aren't designed for the heat and stress of track duty. My take is that this is the sort of hardware to run if you're planning on going to the track with any regularity: https://www.bimmerworld.com/BimmerWo...d-Package.html.

I ran a set of Bimmerworld's studs and nuts on a car of mine for ~75 events and had no issues. They were still on the car when I sold it four years after the studs and nuts went on it.

Due to the initial change at each event from rollers to race tires, a 6-heat cycle tire life, occasionally switching from dry tires to rain tires, rare mistakes made by the mechanic that would render a tire unusable, and the change back from race tires to rollers before the car went into the trailer, that car tended to have 3-6 wheel changes per event. The rollers also came off at the shop after each event and went back on before loading-up to return to the track. The studs and nuts worked flawlessly for hundreds of wheel changes.

I changed my bolts out for studs and nuts as part of the initial build of my M240i and wouldn't have gone to the track without them - if only for the convenience.
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Last edited by dradernh; 10-14-2019 at 06:17 PM..
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      10-14-2019, 10:59 AM   #6
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Yes, wheel studs are already on my Xmas list. Good to know they have that kind of service life.
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      10-29-2019, 02:11 AM   #7
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Hey msendit what widebody is that?
Looks rad
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      10-29-2019, 09:35 AM   #8
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Quote:
Originally Posted by lil_Katsu View Post
Hey msendit what widebody is that?
Looks rad
Thanks!
It's an M235iR kit (replica? not completely sure, I got it from Flossman who I hear are an OEM supplier of some parts).
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      11-25-2019, 04:47 AM   #9
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Couple guys posted lots of good info

I personally have had great luck with the apex steel kit.

I did some ti stud conv kit testing for a company this race season, and when torqued properly. They would stretch and pull the threads to the point that at the end of a race day (4 or 5 qual, 1x max attack, and a finals round) the studs had to be....let’s say needed a bit of help to come off.
Like a torch and sometimes cutting wheel lol

Long story short.
We switched to the apex steel stud kit.
While it may weigh a lil bit more.
For now seems to be problem free and much more reliable.
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      11-25-2019, 09:25 AM   #10
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Aftermarket stud kits are likely more problematic than any factory lug bolt. People also run small spacers without extended lugs and that can cause problems too.
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