My GSL-SE has Riken wheels from the Previous Owner. These are some pretty thick-faced wheels and I need to replace studs. The PO stripped several, which I've replaced with the discarded, used OEM studs, but I don't have any super-deep lug nuts that have a comfortable amount of thread engagement. The originals had shanks that were 1 3/8 long, which reached way into the wheel and had good engagement, so I'm buying more from Summit (or somewhere else).

The issue is the studs. I had to pick and choose through the box of used studs and lug nuts (most of them stripped) from the PO and put together enough OEM studs to do the job on the thoroughly mangled LF hub, but I'd like to order replacement studs as well, while I'm getting the right lug nuts and washers (current washers are oversized and don't even sit in their counterbore). When I look on Summit's site, I need the Knurl Length, Knurl Diameter and Underhead Length in order to get the right studs. Does anyone have this info or have a part number or favorite supplier for this stuff?

 

* Head Code: 295
* Knurl Diameter: 12.90mm / .507
* Thread Pitch: Right
* Shoulder Length: 13mm
* Thread Size: M12-1.5
* Length: 37.5mm
* Type: Serrated Stud
* Features: Zinc plated for corrosion resistance


Dorman Wheel Lug Stud/Bolt, Part Number: 984501 = $2.59 @ advanced

I like, these:

http://store.summitracing.com/partde...5&autoview=sku


-billy

 

Is that 1.500 Underhead basically just the threaded length of the stud? Is 1.500 the Mazda-original stud length?

 

Yes, the info in the first post was what advanced web site spit out for the particular car.

I measured a stock SE rear stud: It is 1.5 under the head.


-billy

 

Gorilla studs 12mm x 1.50, 50mm length, part number 77737XLB fit perfect, open headed lug nuts of your choice work well.
http://www.piloracing.com/products.php?cat=18

 

Nah, man. I've used Gorilla studs on 12A cars and the RX-2, but the GSL-SE has conventional studs pressed in from the rear.



By the way, I just found some nice inexpensive Mosers (8452) at Summit. Curious if they'll work, as I don't know all the specifics on the knurling.

 

The Mosers I'm getting are drilled and tapped, it's better in the long run to go that direction if you're going to get Mosers. pressed are too much of a hassle if you strip or mangle one up.
Screw in studs are da bomb.

 

Update, now that I've seen this linked from another thread. The Moser 8254 (earlier part number was a typo) studs worked great, and were VERY easy to replace. Just take the calipers loose from their brackets, rotate the hub until you've got one lined up where the caliper was, whack it with a good sledge, and the stud will drop right out.

To install, just feed them through from the caliper opening (all 4) and thread on an open-head lug nut to draw them all snug. You can draw them tight and fully seated once wheel is on the ground and you can put the appropriate amount of torque on it.

Moser studs for GSL-SE:
1.5-inch 8254
2.5-inch 8255

 

So the correct Moser part number for the studs is "8254" for the stock size right? Thanks

 

Yeah, 8254 is the winner.

 

Thanks