I think I can get my 11" wide Carrera III's on my GTS by removing the stock rear spacers and putting on 13mm spacers and 66mm studs.

Where is the best place to get 13mm spacers and 66mm studs?

Going from stock 9" wide ET55 with a 38mm spacer to 11" wide ET51 with a 13mm spacer. Sound right?

 

If you could fit them with 15mm spacers, you can get those with studs in them so you won't have to mess with your hub studs.

Dan
'91 928GT S/C 475hp/460lb.ft

 

+1 H&R 15mm Hubcentric Bolt on spacers, might be the simpler route

 

The stock studs are unthreaded the last 25mm. So with a 15mm spacer, the wheel lug hole thickness (?mm), and the dead space inside the lug nut before the thread starts (?mm), I would have 25mm?

Hell it's worth a try. Switching out studs was going to be a bitch due to the necessary rear bearing replacement.

Also, using the 15mm spacers and stock studs, would the studs bottom out inside the lug nuts before getting the wheels on tight? Or would I have to use open end lugs?

Anybody know of any cheaper than this:

http://cgi.ebay.com/ebaymotors/ws/eB...link:middle:us

 

David, I just looked and it looks like the H&R DRM bolt on spacers smallest size is 21mm. Which is what I have on my S4 . Sorry about that. The DRS spacers are 15mm but will require changing studs. Maybe another manufacturer?? A link to H&R spacers at Automotion...



http://www.automotion.com/productpag...321&pid=102089

 

Yeah, those GTS studs are about 75mm long off the hub surface, and would have to be replaced in order to use closed end lug nuts.

Who sells 66mm Porsche wheels studs?

 

David,
Unless I'm missing something, you should be able to remove the stock spacers and run those wheels with 295's.

305's would require some minor flaring, but should be good on the inside.

I'm still learning about wheel fitment, so anyone feel free to correct me if I'm wrong.

Taken from Wheel Fitment Calculator...

 

www.vertexauto.com has 66mm studs.

Would slip on spacers and open end lug nuts be an option?

 

I think even 315/30's will fit on the 11" wide wheels.

The problem I am dealing with is the 38mm spacers and long-*** wheel studs on the GTS.

I'm going to use 13 or 15mm spacers and install 66mm wheels studs to get these 11" Carrera III wheels to fit and look right.

 

Er - OK I'm missing something here...

Your studs are too long with smaller spacers - why not get a partial set of open lug nuts to check for fit with whatever spacers you plan to use - then if all is good - cut the exiting lugs off to length? Pulling out the rear suspension to change the lugs for shorter ones seems crazy to me...?

What am I missing?

Alan

 

Here are some bolt on 15mm spacers. They are cheaper than the ones you linked to on Ebay.
http://www.vertexauto.com/ShowItem/4...2015%20Mm.aspx

Edit: I just realized my link is for one spacer, not a set. Sorry

 

Why even think about studded spacers if you don't need to... Even if you mounted them you'd need to install shorter hub studs or cut them off shorter anyway...?

And its always better for strength & alignment to use direct hub studs anyway right...

This all seems backwards to me - you go to studded spacers to avoid changing out studs that are too short... no?

Alan

 

Yes, I was talking about the vertex 15mm spacers with studs built-in to them. The reason is that slapping on some spacers takes 10 seconds, whereas replacing hub studs takes... a *lot* more than that. I had the 15mm vertex spacers on my '86 and they worked just fine without the need for messing with the studs on the hub.

Dan
'91 928GT S/C 475hp/460lb.ft

 

The problem is that the GTS wheel studs are very long, and bolt on wheel spacers will not work. Cutting off the studs is an option if the 15mm spacer and lug hole space in the wheel wheel allow the lug nut to seat before it hits the bottom of the threads on the stud.

Remember, rear GTS studs are not threaded all the way down. when you remove the stock 38mm rear spacer you reveal the 25mm portion of the studs that is not threaded.

Greg Roberts put these same wheels on his GTS and had to use a 13mm spacer and 66mm studs to make it work without using open end lug nuts.

 

Dave - OK understand the unthreaded portion but then you can't put the studded spacers on either - because the exisiting studs would have to be cut off even shorter in that case to fit - right?

If you change the studs in the hub then you'd have the right length for the simple spacers anyway so studded spacers make no sense either way.

However can't you have the studs threaded/chased further down with a die while still installed - is there a long neck die T-handle tool that would work in this configuration (I seem to recall my father had one...) Is there then any downside to cutting new threads = e.g. is there any post threading hardening of the studs? Sure would be easier - esp if its only a minor clearance issue at the thread end...

If Greg's issue was stud length only thats really easy to solve - if it was running out of thread - harder... but maybe still possible.

Alan