What stud conversion is every one running

[bjz!]

MRG Titanium

[thegenius46m]

Went back to bolts personally after studs backed out on me twice even when torqued to spec and red loctited. Not worth the risk to me. Eventually will do core4 hubs with msi studs but until then, hard pass on the uncertainty of screw in studs. Peace of mind not having to worry anymore about a wheel falling off.

[bigjae46]

The 44mm studs that FCP sell are way too short. I tried them, would have saved about a lb of unsprung weight per wheel.

Needs to be about 60mm.

[Maxima SE]

Who's gonna tell hm

I will. Don't fix whats not broken !

[Nate047]

I'm using Turner studs on mine. No problems yet. I've had them since 2017 and nearly 100k miles mostly daily driving and 4 track days. I feel like a outlier when I say I've had no issues with them lol.

Who's gonna tell hm

[Estoril]

I'm using Turner studs on mine. No problems yet. I've had them since 2017 and nearly 100k miles mostly daily driving and 4 track days. I feel like a outlier when I say I've had no issues with them lol.

Sooooo... just waiting for them to fail?

[zzyzx85]

I'm using Turner studs on mine. No problems yet. I've had them since 2017 and nearly 100k miles mostly daily driving and 4 track days. I feel like a outlier when I say I've had no issues with them lol.

[Tbonem3]

The 44mm figure makes sense to me. 44mm would be the stock 25mm length + another 19mm (3/4") for the nut itself to go on. In other words, the entire stock bolt, including the head, should be about 44mm in total length.

It probably comes down to what these companies are including in these lengths - the end of a stud, about 12mm is smooth (bullet nose or allen style). So one company might just mean the length of the threaded portion, but not the end. Another company might be quoting the entire length. A 3rd company could be quoting the threaded portion only, but not including the 12mm or so that threads into the hub (that receives loctite).

[Slideways]

I don't see how those could possibly be long enough. I can run 12-15mm spacers max with my 78mm studs before the end of the lug nut starts to lose thread. That means the stud should be about 63mm minimum. 19mm shorter on top of that is almost another inch!

Anyway I really distrust my thread-in studs, even replacing them annually so far. Stories about stud conversion failure on track driven BMWs are far too widespread for me to feel comfortable with them at high speeds and high brake and turning forces. Probably going to switch to the Core4 hubs before going on track again.

Yeah, it might be best to check with FCP, but the 75mm APEX studs have a few mm of the hex portion that is not threaded.

[repoman89]

Why are studs easier to snap than bolts if they are the same diameter? is it related to the material used or the fact that the stud + lug nut mechanism is more prone to play?

i personally use 2 wheel hangers to mount my wheels and replace all my wheel bolts with Rein bolts once I acquire a used car and just never torque them to over 90 ft lbs.

Little bit of detail here

https://www.core4motorsports.com/tech

https://www.core4motorsports.com/gallery-of-broken-bmw-wheel-studs

[repoman89]

IMO, yes. They will stick out past the face of the front wheel by quite a bit. FCP does have 44mm studs that they say work with OE wheels and no spacers.

I don't see how those could possibly be long enough. I can run 12-15mm spacers max with my 78mm studs before the end of the lug nut starts to lose thread. That means the stud should be about 63mm minimum. 19mm shorter on top of that is almost another inch!

Anyway I really distrust my thread-in studs, even replacing them annually so far. Stories about stud conversion failure on track driven BMWs are far too widespread for me to feel comfortable with them at high speeds and high brake and turning forces. Probably going to switch to the Core4 hubs before going on track again.

[Maxima SE]

Why are studs easier to snap than bolts if they are the same diameter? is it related to the material used or the fact that the stud + lug nut mechanism is more prone to play?

i personally use 2 wheel hangers to mount my wheels and replace all my wheel bolts with Rein bolts once I acquire a used car and just never torque them to over 90 ft lbs.

[AWE46M3]

+Motorsport Hardware.

I bought the 78mm bullet nose kit. I don’t plan on running a spacer larger than 15mm

Bought direct from manufacture before I knew about the FCP warranty. Very happy with the kit.

[jayjaya29]

+1 for Core4, especially when paired with their new 2 piece lug nuts.

[T-Rex]

Are Studs wear items, but stock wheel bolts are not? For the purpose of discussion... what is the difference?

I've run a few different sets of studs on various cars and have heard the "replace studs periodically" mantra on the forums, so this time I went with motorsport hardware studs/nuts purchased through FCP Euro to capitalize on their warranty. The studs feel like high quality, but the nuts felt better than previous hardware I've used. I'm looking forward to seeing how these hold up over extended use.

As someone who had 3 studs sheer on ACH, I assure you they are a wear item. My Apex studs were installed for 4yrs / 4k miles / 5 track days. I always hand-torqued wheels to spec (85ft/lb), never used power tools to put them on. I will be replacing them annually from now until I get around to doing the MSI conversion.