Granada Rotors- Studs too short, what did you do ?

[kitcarbp]

With those of you using Granada Rotors on your cars, you have likely found that the OEM Granada wheel studs are too short to offer correct (strong/safe) thread engagement to your lugnuts when using alloy wheels with thicker cross sections. The Granada rotors use OEM length studs set up for steel wheels used on the Granadas. I am using acorn style McGuard lug nuts that match the cone seat on my Team 3 wheels.

What length or part number of 1/2" wheel studs did you go with on the Granada rotors to run alloy wheels so you have adequate thread engagement to keep the wheel safely secured? It seems I need at least another 1/4" of stud length, 1/2" would be even better. I could just go down to NAPA and try to find a longer stud but I am sure this is not the first time someone has encountered this.
I dont know the OEM Granada knurl diameter of the stud until I press it out I guess . Advice on what you did ?

[Rick Parker]

How much grip length do you currently have?

ARP makes a set of very high quality long studs that can be trimmed to length as necessary. The standard OEM studs appear to have a .618 knurled area with a length of 1 13/16".


http://www.dormanproducts.com/applic...&cn=WHEEL+STUD

Click on the picture of the individual stud once the site opens for specifics on the individual studs.

[Z-linkCobra]

Im running the Granada rotors on mine. Pop a stud out carry it down to the parts house and they will have a selection of studs. Thats what I did. You have to take the studs out anyway to change them.

[kitcarbp]

Rick yes the Dorman parts are the OEM replacements and these are all too short when using the alloy wheels. The length I am hoping to find is in the
2 1/4" total length. Yes I have seen the ARP studs but these are 3.4 inches long and would need to be cut, which then makes taking the lug nuts on and off a REAL drag and easy to cross thread, I want a proper lead-in at the end of the stud to avoid that. It seems the Granada uses a knurl diameter of 0.554 when new and the Dorman replacements step it up to near .570 to ensure a good interference press fit upon replacement. I guess I will study the Dorman catalog until I find one. The Granada UHL seems to be 1 7/8". The best match I can find is a 2 3/32" with a 0.565" knurl diameter which may give me enough length Dorman 610-391

[Silverback51]

Check with NAPA.

I had to do this once on one vehicle I owned and they had the studs in 1/4 increments.

[FWB]

at one time dorman made quality products, but for your life being in the hands of your wheel studs you should ask yourself.....do i trust communist china to make a stud i entrust my life to?

all dorman products are now made in china re-sell. if the arp is the only alternative and you need to cut them down.....do it....enough said...

[kitcarbp]

Here is some detail I found from the "Wheel Professor" (very informative website BTW) about lug nut thread engagement. The SAE recommendation is to make sure you have at least the diameter of the wheel stud worth of thread engagement. In my case I use 1/2"-20 wheel studs. So the minimum thread engagement on the lug nut is to be 1/2" or about 10 complete turns/threads on the nut. Of course it will depend on the Mounting Pad thickness for the wheel you are using. In my case with the OEM Granada disc studs I have between 5-6 turns worth of engagement onto my Team Three Wheels which means the lug nuts don't have the adequate 10 turns and the lug nuts will tend to loosen over time . This is not on issue on my rear wheels since the 9" ford axles have longer studs and offer more than 10 turns of lug nut engagement.

Before hitting the road, make sure to check thread engagement when selecting the wheels and lug nuts and fitting them to rotors with OEM stud lengths. Chart attached is from the Wheel Professor's tech section on his website. Hope this info helps others.

[tcrist]

I would just get the longet studs. Install one to check and see how much you have to cut/grind off.

Then put the studs in a vice with a standard lug nut screwed all of the way on.

You then grind/cut off what you need and file/shape the end of the stud so that you can unscrew the lug nut easily.

That way you know that you will not have an issue getting the lug nuts to thread on correctly.

[FWB]

Originally Posted by kitcarbp

Here is some detail I found from the "Wheel Professor" (very informative website BTW) about lug nut thread engagement. The SAE recommendation is to make sure you have at least the diameter of the wheel stud worth of thread engagement. In my case I use 1/2"-20 wheel studs. So the minimum thread engagement on the lug nut is to be 1/2" or about 10 complete turns/threads on the nut. Of course it will depend on the Mounting Pad thickness for the wheel you are using. In my case with the OEM Granada disc studs I have between 5-6 turns worth of engagement onto my Team Three Wheels which means the lug nuts don't have the adequate 10 turns and the lug nuts will tend to loosen over time . This is not on issue on my rear wheels since the 9" ford axles have longer studs and offer more than 10 turns of lug nut engagement.

Before hitting the road, make sure to check thread engagement when selecting the wheels and lug nuts and fitting them to rotors with OEM stud lengths. Chart attached is from the Wheel Professor's tech section on his website. Hope this info helps others.

I know a good machine shop that will make them look OEM....

wink, wink.....nod,nod.....

[strictlypersonl]

When I ran into this with some Torq-Thrusts, I counterbored the wheels to accept longer nuts with the flat interface.

[kitcarbp]

Yes counterboring is another solution if theres enough clearance on the wheel center, but it should be easy enough to get 1/4" longer studs and bang them on in and Im done. Thanks

[Tim Brewer]

I had the same problem, Moroso makes wheel studs that fit your hubs.

[randlej]

I am using ET style lug nuts and it works great. These have a sleeve that give you extra thread room. You can order from most wheel dealers and even on ebay.

Much easier and cheaper solution.