Converting wheel bolts to studs and nuts

Studs posted back in the summer here now spotted in the 2012 Demon Tweeks catalogue

 

Discussion on fitting Honda ARP studs http://forum.vwsport.com/viewtopic.php?t=21467

 

more ebay studs http://www.ebay.co.uk/itm/200713926209?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649

 

Been working through some front drive flanges today.

I chose ARP studs part number 100-7719 they're listed for Mazda race applications.

Wheel Stud Style Press-in
Wheel Stud Thread Size 12mm x 1.50 RH
Knurl Diameter (in.) 0.507 in.
Underhead Length (in) 2.750 in.
Knurl Length (in) 0.335 in.
Quick-Start Nose No
Quantity Sold as a set of 4.
Notes Designed to fit Mazda front or rear 1990-93 applications
and front only on 1994-2005 applications.

The knurl diameter is pretty small and doesn't need a lot of metal taken out. I drilled the threads out to 12.5mm and them reamed the holes to 12.75mm. (After checking with ARP

Pressing them in is a nice tight fit.











I made this tool to spot face the back of the flange, it's a bit rough but seems to work OK.
I'm still figuring out all this machining stuff.



















Here I'm just trimming a little off the inner edge of the stud heads so they don't foul on the hub.

 

Nice work Peter. It had never occurred to be that spot facing would be necessary for ARP stud heads pushed through from the back on the front drive flanges. I'd looked at ARP studs a few times and wondered whether to use them.

Fairly commonplace to spot face on the back of rear discs or drums, and hence so few people do it!

Hope your build is coming along well.

 

Did the rear discs. I modified the spot facing tool to reduce the diameter of the cut to the bare minimum.

Some discs are more suited to this than others depending on the ID of the bell.

I had to take a small cut into the sides for clearance, for most holes it's about 1-2mm.

In hindsight maybe a better approach might have been to turn the heads on the studs down a bit.

The thickness of the sides varies around the disc and from the top to the bottom of the cut.

I don't think the amount I've had to remove is enough to cause any issues given how little work the backs do and the perhaps overdone thickness of the bell in the first place.

Anyway, here's a bunch of pictures, I'm pretty pleased with the result.

 

Intricate machining work there.

Very nicely done

 

Studs ordered from a guy having them made in another forum (yes there are such things!)

They are tried and tested on theirrace cars which are far faster than mine, ill let people know what they are like. Only 80 posted to!

 

The proper specs on these are:

M12x1.5
70mm overall length
EN24T Stud and lightweight nut

They are dry oil dipped

The ones ive order are used but as new just to save a bit of money. Looking forward to getting them on this weekend after years of reading this thread and trying to decide what to buy!!

 

Would be verrrrrrrry interested in these if you could hook me up?

These look the best by far, and at that sort of price, not too harsh on my wallet

Cheers,
Bruce.

 

I bought a selection of 70mm and 90mm, the latter to allow for spacers (total length measurements).

So 70mm is looking ballpark. These translated to 47mm protrusion.

PM me to assist with a Group Buy pls. Thanks

 

now fitted my set, great fit and quality. slightly long but no real problem!

 

Peter would these studs be long enough to fit in a set of 10mm spacers and still secure the wheel safely.....

 

Was that question directed at me?

If so then the answer is yes, but that's based on a steel wheel. Alloy wheel have thicker hubs, you'd have to check your specific application.

Rear studs ended up longer than the front as they don't have as much metal to pass through.

I can measure the exact length protruding from the hubs if you'd like.

 

sorry Peter that was directed at you. Can you measure the protruding length and then I can check if they would work on my wheels and spacer arrangement before ordering them.

 

Sorry Ryan, I've sort of run out of time, I'm off to Amsterdam for 10 days. I'll take a look when I get back to Oz on the 15th.

 

No problem peter. I have a feeling now after reading another post that they will be M12 being a four stud hub and the vr6 I have will be M14 being 5 stud but when you get back I'll still grab the measurements off you. Have fun in Amsterdam.

 

Back again,

Yep, my studs are M12, here's the specs again so you can do the math on the hub thickness.

Wheel Stud Style Press-in
Wheel Stud Thread Size 12mm x 1.50 RH
Knurl Diameter (in.) 0.507 in.
Underhead Length (in) 2.750 in.
Knurl Length (in) 0.335 in.

I measured them today,

Fronts have 44mm of thread protruding and protrude 55mm in total.

Rears have 42mm of thread protruding and protrude 53mm in total.

The nuts I've chosen are 20mm overall.

I tried 13 and 15 mm spacers with the the G60 steel wheels and there was still about 4mm of thread left.


Front with no spacer fitted.


Front with 13mm spacer.


Front with 15mm spacer.


Rear disc total protrusion.


Rear disc total protrusion.

 

I`m running ACS Race series studs




A proper raised shoulder to securely seat onto the hub

 

cheers Peter. I'll have a check when I get near the car again.