I was shopping for Evo X's wheel studs, but aesthetically I don't like how ARP's Evo wheel studs (p/n: 100-7717) protruding so much from the lug nuts. Our OEM wheel studs MB911495 are M12x43 sized, and have an under head length (UHL) at 1.7 inches (43mm). Meanwhile, the ARP 100-7717 have a massive UHL at 3.000 inches (76.20mm).

Even 100-7717's threaded length = UHL - Nose Length = 3.000 - 0.350 = 2.650 inches (67.31mm) is long enough to allow wheel spacers as thick as 24mm, at least theoretically.


Example of ARP wheel studs sticking out.

Interestingly, ARP also makes wheel studs for Celica/MR2/Tacoma/350Z/370Z (p/n: 100-7718). It has the same knurl diameter (KD) at 0.565 inches (14.35mm) as 100-7717, which means it's the right size for our Evo 8/9/X's hub holes. Its diameter x pitch is also M12x1.5, same as 100-7717 and MB911495. Its UHL is 2.340 inches (59.43mm)

100-7718's threaded length = UHL - Nose Length = 2.340 - 0.363 = 1.977 inches (50.21mm). Theoretically, 100-7718 would allow wheel spacers as thick as 7mm.


ARP 100-7717 and ARP 100-7718 side-by-side. (©ARP)

What do you guys think? If I don't use wheel spacers or use only 5mm spacers on the front, can the Celica studs 100-7718 be a logically acceptable choice for aesthetics? Or is it the best to pick the longer wheel studs 100-7717 for mechanical reasons?

 

Interesting! Following for others response. I personally don't like the aesthetic of how far arp's poke.

 

it helps in mounting wheels while avoiding to damage the brake caliper paint

 

Speaking of ARP wheel studs 100-7717 versus 100-7718, recently during a wheel bearing replacement, I measured the under head length (UHL) of Mitsubishi OEM wheel studs. The OEM wheel studs' UHL is almost exactly 45 mm (1.77 inches).

Therefore, no matter if an Evo X owner chooses to use 100-7717 (UHL = 76.2 mm = 3.00 inches) or the shorter Celica version 100-7718 (UHL = 59.4 mm = 2.34 inches), there will be sufficient threaded length for mounting wheels without spacers. That being said, open end lug nuts remain as the more prudent choice, because they can never bottom out.

Stock(-ish) Evo X owners should not worry about needing aftermarket wheel studs. I'm realizing that probably the OEM wheel bearing would wear out, before the wheel studs lose too much threads. (Here, my wheel bearing wore out after 116k miles.) When the wheel bearing is being replaced with an OEM unit, Mitsubishi will have the new wheel studs included and pre-installed:


^ Mitsubishi OEM wheel bearing 3785A015. It comes with all five wheel studs installed.


^ The Mitsubishi OEM wheel studs have an under head length (UHL) of 45 mm, or 1.77 inches.

 

I personally like them.