I have a 87 se V6 5 spd and I went to do the GA brake upgrade and I went and got the longer wheel studs for a 91 and they are a lot smaller than the stock ones on my fiero. The new studs almost pull through the stock holes on the hub. Is it possible some previous ownder drilled out the hubs and used other studs or are the 2 parts stores giving me the wrong studs?? The threaded area on the "stock" studs is all the exact same size just longer. The "knurled: part I think its called is bigger. Any ideas??
Same problem here. The ones in the turned down hub have ~13mm knurl. I also bought the long ones and found them too small as they have a 12mm knurl. I was thinking of dropping by the local tire store and see if they have anything similar with the longer length.
Anyone have a good place to look?
EDIT: I looked up ARP wheel studs at Summit. The closest I could find were 12mm X 1.5 RH studs with a .509 inch knurl (that is 12.93mm converted) and 2.5 inches long (63.5mm). Set of 5 was $11.95.
[This message has been edited by Hudini (edited 02-21-2007).]
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11:23 PM
Feb 22nd, 2007
turboguy327 Member
Posts: 1692 From: Webster, NY USA Registered: Feb 2007
Not as of yet. My car mostly sits though as I work out all the bugs from a run down, abused car that is getting the TLC it needs to work reliably. I replaced the wheel bearings and seals while I was there.
The only issue that concerned me was the space between the cut down hub and the inside of the new vented rotors. There was a bit of play which I thought may turn into an unbalanced condition. So far it has not been an issue even with the car over 100 mph. Now the loose steering rack ends and worn tie rods are another matter......
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08:57 AM
typhoon Member
Posts: 1006 From: The Peoples Republic of Wisconsin Registered: Sep 2005
98501 is what i purchased and the knurled part is too small. It almost pulls through the stud holes in the hub. I got the same ones from autozone and the same situation
Stock wheel studs (Dorman # 610-254) are about 43mm long. Part # 610-323 (54mm) are listed as longer alternative studs for the Fiero. The knurl diameter is slightly smaller (0.06mm) than the stock studs, according to the Dorman specs.
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[This message has been edited by Fiero_Adam (edited 02-22-2007).]
The problem is that West Coast Fiero has replaced the stock studs not with the longer ones (98501) , but with a different type altogether. They are about the stock length, but has a knurl that is about 1mm larger than stock. So the longer ones will not fit. The issue now is finding a stud that fits and is longer.
The ARP studs I mentioned above are for late model Camaro/Firebirds/Corvette: ARP-100-7708 (summit part number)
The question is who can find longer ones that fit the WCF hubs with the GA rotors?
I just measured my longer replacement studs that were too small for the WCF hubs, they are 54mm long and the knurl is just slightly smaller than 12mm. (measured with a cheap plastic slide caliper) I remember measuring the WCF studs and they were very close to a 13mm knurl. The Summit studs are 63.5mm (2.5 inches) long and have a 12.93mm knurl (.509 inches).
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07:49 PM
PFF
System Bot
turboguy327 Member
Posts: 1692 From: Webster, NY USA Registered: Feb 2007
I am the second owner and the girl I bought the car from said that she never had anything but stock replacements from the dealer. The dealer did all the work on the car. So thats why I am so confused. I have all the recipts from everything done and they put new rotor/hubs on it. So they arent from anywhere special??? A 14 mm open end wrench slides onto the knurled part with barely any play if that helps anyone with ideas?? thats all I have to measure it with until monday
OK, stock studs (610-254) have a knurl of 12.73 mm and are 41.5 mm long. The replacement ones that are 54mm (610-323) have a knurl of 12.67 mm. I found a stud that is 49 mm long with a 13.55 mm knurl. The shoulder is a little bigger, but shouldn't be a problem. Part number is 610-374.
I must apologize for measuring incorrectly last night. Your numbers for the 610-323 are consistent with what I have in hand. I had set the knurl too close to the slide portion of the caliper. The difference is about 1mm of error.
Part number 610-374 sounds like a player. The studs on the cut down hubs have a significantly larger knurl. I am now wondering if I measured the bigger studs correctly though....
turboguy327, can you get a decent measurement of the studs you have? Or better yet, look on the head of the stud to find the numbers. My replacement studs have 323 and 10.9 stamped on top.
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10:06 PM
Feb 24th, 2007
turboguy327 Member
Posts: 1692 From: Webster, NY USA Registered: Feb 2007
found some that will work for me from advance auto part #97059 took him a little while of searching but they are long enough and will work great once i get my new wheel bearings. maybe that will help you Hudini if you didnt purchase those from summit yet
Cool, thanks. I will check it out. Am trying to enjoy the car for a bit since I finally have it together in one piece. But who am I kidding, better get those wheels off there......again.
found some that will work for me from advance auto part #97059 took him a little while of searching but they are long enough and will work great once i get my new wheel bearings. maybe that will help you Hudini if you didnt purchase those from summit yet
I went and bought the wheel studs you mention above, Advance part #97059. I then took out one of the studs on my West Coast Fiero hub. I also grabbed one of the Dorman part number 610-323 or Advance Auto part number 98501 longer replacement studs that the local auto parts stores sells as a direct (longer) Fiero replacement. Here is what they look like:
The 98501 is on the left, the one that came in the cutdown hub is middle, and the 97059 is on the right.
What I like is the knurl on the 97059 (right) is longer than the hub is thick. It will stick partially through the GA rotor and center it on the studs. The WCF hub studs were smaller than the GA rotor stud holes and had a bit of play. The problem right now is the knurl is about .5mm too big. I have to drill out the GA rotor's stud holes about 1/32nd to 17/32nd (1/2" + 1/32") make it fit over the bigger knurl. It should work out though.
