So I have a 2012 R56 and I am considering the way motor works wheel stud conversion kit. Wheels arent something I mess with often, and the wheels that I have mounted are actually the first aftermarket wheels I've had on any car I've owned. They are motegi MR 125's. What size stud would I need to not have a ton of stud showing through the wheel, and does the change to m12 affect how these wheels will fit? Would I need some sort of spacer. Sorry if these questions are dumb, just new to this stuff. Thanks, Mike

 

I convert every car under my ownership to studs at the earliest opportunity. Wheels are always coming off for routine maintenance, cleaning, winter tires, etc... Ironically our R56 is one of the few cars I haven't converted, since the wheels are so light.

1) You want at least a bit of stud to be visible outside the nut (assuming you're going with open nuts), and stock lug bolts are 28mm long apparently. The math depends on the nuts you go with, and whether you'll use spacers or not.

2) Any reason you are switching to M12? Is the kit you're looking at an M14 to M12 conversion? If you are going down to M12, the wheel fitment should not be affected. Nearly all wheels are hubcentric (meaning the back of the wheel fits perfectly onto the protruding ring on the hub), and the lug holes in the wheel will fit 12mm if they fit 14mm, so if those Motegis are for the R56, you should be solid.

 

No no reason to go to M 12 in particular that was just what the kid that I found offered. Good information thanks for the reply

 

No worries man. I looked up the kit and they state the (single) advantage is easier lug nut availability, which is not really an issue in my book... you could just as easily stick with the stock M14 x 1.25 lug conversion from them. Either way

 

The whole purpose of the stud conversion kit to M12 is to open up the available wheel options. Im sure you can find an M14 stud kit if that is what you are looking for.

2) just because a wheel is hubcentric does not mean that the load is not shared with the stud/bolt. load will always be shared at this interface. The factory chose 14mm bolts to share the load with the hub. I wouldnt swap to 12mm studs just to have studs.

 

Available wheel options? R53 (12mm) wheels bolt right up to R56s with no modifications, and most aftermarket wheel bolt holes are at least 14mm. Especially if they're "for" the R56...

To your second note, I don't understand your point; the "load" vertically is nearly entirely reliant on the hub centric ring (ever run wheels that don't fit the hub ring?), but for the horizontal load it doesn't matter whether you use 12mm or 14mm width studs/bolts. Yes, 14mm are stronger, but there are a million cars with much more unsprung weight on 12mm hardware from the factory.

 

The "load" is a radial load that is shared between the hub and the bolts. The conical surfaces between the bolts and the wheel are capable of supporting a substantial load. Why would the factory switch from 12mm to 14mm for no reason? There is always a reason. it may have been strength concerns or may have been something else.

 

I'm sure there was a reason. But why change absolutely anything on a car after it leaves the factory, by that logic?

And for the record, I was the one recommending OP stay with 14mm

 

We also offer them M14x1.25 to M14x1.5 so you don't have to go to 12mm. But the change to the 1.5 thread pitch makes finding different nut options much easier and cheaper.
https://www.waymotorworks.com/m14x1....-stud-kit.html

 

Thanks for all the tips guys

 

How often do you recommend replacing the studs Way?

 

Only when you wear them out as we haven't seen someone wear them out yet.

 

Cool thanks Way