The existing rear wheel studs are beefier than the FFR replacements. Why change them? Just to match the fronts? I am sure a wheel can fit on the fatter studs. Or not? And why are the Mustang front studs so whimpy? Or not?
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The existing rear wheel studs are beefier than the FFR replacements. Why change them? Just to match the fronts? I am sure a wheel can fit on the fatter studs. Or not? And why are the Mustang front studs so whimpy? Or not?
I havent tried a wheel on the bigger studs but I think its just so all are the same. If the wheel fits over the studs, I will just buy the right nuts next time I do an IRS car.
Mike
What you're seeing is the front hubs Factory Five uses are 1/2-20 SAE threads. Common for that vintage part. The 2015+ IRS hubs are 14mm x 1.50 metric threads, which Ford has switched to. The studs Factory Five supplies for the IRS hubs are the same 1/2-20 SAE threads as the front hubs and makes them all the same, including matching what comes with their wheels if you're using them. You could not change the studs on the IRS and get metric lug nuts for the rears. Personally not my choice. I can just see someone (me included) mixing them up and cross threading something. I haven't checked, but may also use a different size socket. Avoided with one time effort versus dealing with it all the time. Obviously your choice though. There isn't an issue with one being stronger or beefier than the other. Both are more than up to the task.
Last edited by edwardb; 12-12-2018 at 06:24 PM.
Build 1: Mk3 Roadster #5125. Sold 11/08/2014. Build 2: Mk4 Roadster #7750. Sold 04/10/2017. Build Thread
Build 3: Mk4 Roadster 20th Anniversary #8674. Sold 09/07/2020. Build Thread and Video. Build 4: Gen 3 Type 65 Coupe #59. Gen 3 Coyote. Legal 03/04/2020. Build Thread and Video
Build 5: 35 Hot Rod Truck #138. LS3 and 4L65E auto. Rcvd 01/05/2021. Legal 04/20/2023. Build Thread. Sold 11/9/2023.
I have 10 Ford Motorsport M14x1.5 lug nuts for next to nothing if interested.
You're right. Oversize holes like that would be totally unacceptable. If the rotor were actually aligning on them. But they're not. As CraigS said, the alignment is on the hub and should fit accurately. The holes for the studs provide clearance and anti-rotation. Once the wheel is on and lug nuts tightened, they're locked down. Related to this, if you happen to need or use wheel spacers, also make sure they're the hub centric variety. Some, especially the cheap ones, aren't.
Build 1: Mk3 Roadster #5125. Sold 11/08/2014. Build 2: Mk4 Roadster #7750. Sold 04/10/2017. Build Thread
Build 3: Mk4 Roadster 20th Anniversary #8674. Sold 09/07/2020. Build Thread and Video. Build 4: Gen 3 Type 65 Coupe #59. Gen 3 Coyote. Legal 03/04/2020. Build Thread and Video
Build 5: 35 Hot Rod Truck #138. LS3 and 4L65E auto. Rcvd 01/05/2021. Legal 04/20/2023. Build Thread. Sold 11/9/2023.