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Discussion Starter #1
Is there a source for longer rear wheel studs for a '67 Duetto? I have a set of Alfa Magnesiums 6J 14 H2, C35 campys. I have the the known rub problem witht he ball joints on the front and can get around that with new rotors with longer studs and, because of the offset, a 7 or 10mm spacer. However, I can not locate longer studs for the rear. No interference on the rear, but I only have about 5 turns on the lug nuts and that scares me a bit. So, the best I can tell, I need studs that are longer than the originals. Probably 3/8" longer at the least. I do not expect to find right and left threads so would opt to go clockwise all around. Any ideas? Thank you.
 

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IAP used to carry studs, are they just out of them? If not, it might be much harder to upgrade to a limited slip rear end from a '72 or later Spider. They can usually be had for less than $200 with axles and rotors.

Bill
 

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Discussion Starter #3
Bill, I kind of want to keep this duetto as original as I can. I would sacrafice going to rhight hand threads on the driver side, but to have to change out the rear axle et. al., I think I will have come up with another cure. Thanks for you input.
 

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The rear stud is Item #39852 in the IAP catalog, $11.25 each! It does say to check for availability.

Bill
 

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Discussion Starter #5
Ya, I checked with them and Centerline before the initial post. They contend that they are not getting them anymore. They suggested going to a machine shop. As long as the hardness and temper are a match, I may have to do that.
 

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I have the same problem in the UK - a nice set of alloys to fit to my 1968 Spider and no long studs available. If you search the archives you'll find someone who made M12 bolts fit but I can't find any very high tensile (> 8.8) bolts to do this with. I'm currently investigating regular splined wheel studs, trying to find one with a small enough spline to fit the holes in the hubs. Alternatively I'll get some larger ones and have them turned down to fit. I'd prefer to not have to drill the hubs.

Do you know if the front studs are effectively the same as the rears?
 

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Discussion Starter #8
I'll look through my junk and get back to you, I should have some of the long studs somewhere.
Rogerspeed:
Any luck over the weekend? I am stuck out in the middle of the Ozarks and can not locate a machine shop that wants to try and machine one, let alone 8 to 16 of them. They won't even work on my '71 without longer studs.
 

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I've found longer, replacement studs so I can fit alloys to my 1968 Spider. The specification is M12 x 1.5, 10.9 grade, 70mm overall length (65mm from base of stud head) with a 12mm diameter spline. I measured the spline and it is actually 12.13-12.15mm while the hole it fits into is 12mm, so you get a nice tight fit. You will need to grind a slight flat off the stud head to match the originals.

In the photo you can see the new, sliver stud and the front studs it replaced. The original LH threaded one was way too short - only 5 turns on the lug nut. The other one is an original long stud where someone had fitted later front discs - I replaced them with the new studs as they give another 7mm of usable thread.

I've just done the fronts, didn't take long and you can do it with the disc in place, just loosen the caliper mounting bolts - no need to open the brake lines. I'm really hoping the rears are going to fit just as well.
 

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Discussion Starter #10
Cosmo, thank you for the info. I will look here for the sme studs. If I have a problem, can you tell me where you got them? Local? Ordered them? If so, catalog or internet? I am in a rather remote area and may have to search the internet for the bolts. Thanks for the photos. Will the lack of splines on the new ones be an issue?
 

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Cosmo, thank you for the info. I will look here for the sme studs. If I have a problem, can you tell me where you got them? Local? Ordered them? If so, catalog or internet? I am in a rather remote area and may have to search the internet for the bolts.
I got mine from a UK supplier who specialises in wheel spacer kits and stocks extra long wheel studs and bolts. I would think you would be able to find similar in the US.

Thanks for the photos. Will the lack of splines on the new ones be an issue?
It's actually the other way round. The original studs are smooth, the new ones have the splines. I've just fitted the rears (which need shortening from the supplied 70mm length) and they fit nice and tight.

One of the rear parking brake shoes fell apart in the process though! :mad:
 

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ARP wheel studs

i am looking in a JEGS cataloge and they list a 12mm x 1.5 press in stud .485 knurl 3 in long [fits 1980 to 00 hondas] or same size with a .509 knurl 3.250 in long [for late camaro firebird corvette] pak of 5......$25.99 camaro....19.99 honda ..... seems like the honda would fit....measuring a rotor 0.485...............jegs.com
 

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Discussion Starter #14
Really am lost!

Cosmo -- Looks great, Mine will be mirror image. I have run into a bit of a problem and need you hlep. OK, I got the front hub and disc off the car. I separated the two. I have now found that the studs have hex heads, no flattend side. One of hex sides is so close to the hub casting that you can not freely rotate the bolt. When I look at all the schematics, it shows a bolt with out threads near the head. My question is this, Do these studs get "hammered" out? Do they "unscrew"? I have tapped the stud and it won't move, I have tried to rotate and it won't move. I'm a fraid I am going to bust something.
The idea of buying a new rotor won't work, The studs are part of the hub!
 

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eurospider-
They are just pressed in place - try heat - or anybody with a press can push them right out. Also I believe new rotors come with LONGER studs for alloys....
 

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eurospider-
They are just pressed in place - try heat - or anybody with a press can push them right out.
Or a BFH will do just as well. :D
Also I believe new rotors come with LONGER studs for alloys....
Apparently not from the usual sources I tried. They are now sold without studs and you are expected to reuse the old studs.
 

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Discussion Starter #17
A BFH it is. Maybe I'll try to press one out first. Thanks guys, I almost did both but was concerned for the casting. Chow.
Jim Smith
 

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Discussion Starter #19 (Edited)
I found them at JEG'S High Performance. It appears that part number CRP3 is a M12X1.5, 70 mm overall, with 51mm thread length and a 12mm spline.
Low and behold, the Applications are Ford, Rover, Honda, Hyundai, Alfa Romeo, Mazda, Toyota. Thanks to Cosmo and the rest for the help and direction. I am taking the old studs out before I decide if I will need 2.85 or 3" long studs. I am putting on a 8mm spacer for clearance from the ball joint on the front. Not looking forward to tackling the rear, but will have to suck it up.
Jim Smith
 

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Discussion Starter #20
Cosmo, how much shorter did you have to make the rear studs? How much did you have to cut off the 70mm studs? I can order shorter studs. Will order them Monday.

Thanks, Jim
 
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