Studs for a narrow body 5 lug using new URO hubs Options

[bdstone914]

@Lanner

date='Apr 1 2021, 07:47 PM' post='2904857']
[quote name='Superhawk996' post='2904747' date='Apr 1 2021, 02:07 PM']

However, Modern rotors don’t pilot off the OD of the hub so there wouldn’t normally be any particular concern for radial runout other than how it might affect balance.
[/quote]

Haven't worked on too many Porsches huh? (IMG:style_emoticons/default/biggrin.gif)

I think the issue with the first run was the counterbore diameter. It was tight for the head of the stud hence the issue. I don't believe the issue was with the spline diameter. (IMG:style_emoticons/default/confused24.gif)
[/quote]


What I was trying to explain was that my exlerience with installing studs in OEM hubs is that if the hole is too small for the stud that the stud splines shave and that the hub does not distort. The fit is critical. It seems like the variation can be no more than .002" plus or minus on the studs. There is brand to brand variation. I would like to see some actual measurements of the Porsche studs and the recent Veribus studs.

[Superhawk996]

This might help clarify what I was referring to as a hub type that helps hub avoid lateral and radial runout issues when studs are pressed in.

Red is wheel pilot

Black is rotor pilot

Yellow trough area helps prevent distortion when studs are pressed in. Allows for a final finish machining after the studs are pressed in.



So many hub types out there but this is what I was referencing. I’ll measure up URO hubs as received and after stud install. Post more later when I have parts to compare to 914 and 911 early rear hubs.

[Tdskip]

So if I am OK with stock lugs, am I really only needed to order one new lug per hub? Better to replace them all? Don’t think so, but wanted to ask.

Thanks!

[Superhawk996]

So if I am OK with stock lugs, am I really only needed to order one new lug per hub? Better to replace them all? Don’t think so, but wanted to ask.

Thanks!

@Tdskip

(IMG:style_emoticons/default/unsure.gif) Are you mixing lugs and studs?

5 bolt conversions used pressed in studs like 911 hubs.

Standard 4 bolt VW arrangement are lug bolts that thread into the hub.

The 5 bolt URO hub will used the pressed in studs and you'll need 5 of them per hub.

Maybe I'm misunderstanding the question? (IMG:style_emoticons/default/idea.gif)

[Tdskip]

So if I am OK with stock lugs, am I really only needed to order one new lug per hub? Better to replace them all? Don’t think so, but wanted to ask.

Thanks!

@Tdskip

(IMG:style_emoticons/default/unsure.gif) Are you mixing lugs and studs?

5 bolt conversions used pressed in studs like 911 hubs.

Standard 4 bolt VW arrangement are lug bolts that thread into the hub.

The 5 bolt URO hub will used the pressed in studs and you'll need 5 of them per hub.

Maybe I'm misunderstanding the question? (IMG:style_emoticons/default/idea.gif)

Yep, not enough coffee or brain power, totally mixed them up!

Sorry!

[Zaffer]

So, based on what I’m seeing, I can run 914-4 axles, but with a five-lug wheel, and all I need to do is install these hubs with five-lug rotors? I can even retain 914-4 sized rotors and use the 914-4 stock calipers?

[Superhawk996]

So, based on what I’m seeing, I can run 914-4 axles, but with a five-lug wheel, and all I need to do is install these hubs with five-lug rotors? I can even retain 914-4 sized rotors and use the 914-4 stock calipers?

Yup - but /4 rotors need to be redrilled to 5 bolt pattern. PMB or any competent machine shop can do that

If you go to 5 bolt rear rotors (vented) now your into caliper charges to accomodate the thickness of a vented rotor.

914/6 solid rear rotor (5 bolt) is ever so slighly different than the /4 rotor. It is 4mm (0.160") larger (286 mm OD) vs. /4 rotor (282 mm OD). Thickness of the /6 solid rotor is 1mm (0.040") thincker. If you encounter clearnance issues to /4 caliper housing due to larger OD, the 4 mm of rotor OD is easily removed by any competent machine shop.