144 wheel studs

jrhendo

Can anybody tell me the size of the knurled bit at the base of 144 wheel stud? Do any of the ARP range fit? Or does anybody have genuine ones or other good quality ones to sell?

ramrod

Evening

I can source new studs if you like

Genuine ones

jrhendo

ramrod Hi Sam, can you let me know what they cost?

jamesinc

@jrhendo do you know if the 140 stud is the same as the 240? I have a new 240 stud in the garage I can measure if you want.

jrhendo

jamesinc please. I’m pretty sure they are the same. Certainly the nuts are.

Major Ledfoot

The books say they're different, sorta.

p/n 685254 is the 164 longer front stud for vented rotors.

p/n 676364 is the front and rear for non-ventilated 164s, and 140 non-vented fronts.

p/n 676338-7 are 140 rear studs.

p/n 1229808 (supersedes 676338) are 240 studs.

jrhendo

So it looks like 240 and 140/studs are probably the same. I’d seen before that 164e studs are longer but I’m running 164 vented disks on my 142 and my 144 rally car and I don’t recall putting longer studs in.
I’m pretty sure my 240 rally car has ARP studs so that might be an option if I get the dimensions.

ramrod

$17 each

Major Ledfoot

^ For the long 45mm studs, and shipped?

ramrod

Morning

Yes correct

242GT

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164 vented discs on my 144 race car , from memory I think I also put the longer 164 studs in as well.

jamesinc

@jrhendo sorry I found that stud finally, the OD of the knurl is 16.4mm and the base circle is 15.8mm. The shank is 16mm long and the threaded section is about 26mm long.
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242GT

Is that stud for the solid standard disc or conversion to the vented disc

Major Ledfoot

242GT Vented disc stud is 45mm.

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jamesinc

242GT these are for the rear hub so solid disc

jrhendo

Just out of interest, does anybody know the face thickness of the 164 vented disk vs a 144 solid disk to need the longer studs for the vented disk? I’m currently a long way from home or I’d do it myself.

Major Ledfoot

Pictures speak louder than words, so.....

164 vented disc, p/n 688950-5
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140 /164 ATE solid front disc, p/n 687308
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jrhendo

Interesting stuff. So the studs should be 5.9mm (11.5-6.6) longer. I thought I was using the same studs F&R but I must be wrong because I’ve got about the same amount of thread proud of the nut. This of course assumes that the 164 hub flange is the same thickness as the 144 one. That may be the answer because I’m pretty sure I’m using my original 144 hubs. Something to look at.

Also interesting is that the holes for studs (16.5 vs 16.25) and retaining screws (7.5 vs 7.25) are different, albeit not by much.

Finally, I’m using 144 calipers with a spacer plate to get the greater pad surface area compared with the 164 calipers. The diagrams show I should have about a 2mm misalignment - 62.6 vs 64.5 inner face to inside of disk. I didn’t think I had that but I’ll certainly look at all that when I get the car back from Paris.

Thanks for all that info.