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Wheel offset confusion . . . replacements

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I am in two minds whether to refurb the 15" teledial wheels that are currently on my sept 88' 944 or to try and pick up some larger more modern wheels second hand . . . How ever I am concerned that the stud pattern or the off set will be incorrect.

I am confused as I have 15" wheels on my sept 88' 944 NA but according to the following documentation on http://members.rennlist.com/951_racerx/WheelsFAQ-StockSizes.html my car should have 16" wheels fitted which would have an off set of 52.3mm as apposed to 23.3mm of the 15" teledials currently fitted? (not checked but presumed they are as they are 15" not 16") I have contacted the original owner an he assures me that they are original. (All 4 wheels seemm to be identical)

So back to my replacement wheel options - should I be looking at replacing them with an offset of 52.3mm or 23.3mm? Are the stud configurations and the wheel bolts & nuts the same for all porsche wheels or would this also have to be a consideration?

I have seen on a previous post that ABS has a potential part to play? What is the option for ABS? I dont think I have ABS but it would be good to know either way.

Any help would be much appreciated, sorry the post is so long . . .
 
The introduction of ABS affects the offset of all the cars whether they have it or not, the hub design was changed to accomodate it across the range. It could be yur car was held unsold before it was registered or you may have the later offsets - I think Lux's continued with teledials till the end. The offset may be stamped on the rear face of the wheel - it certainly is on cup wheels. I believe the bolt patterns are the same across the range of 5 bolt wheels. If you have later offsets (post ABS) the range of modern wheels that fit is much larger.
I am not certain on the 15" 16" issue but the drivers handbook should tell you,

Tony
 
If my car has 23.3 15" teledial wheels on it, can I put larger wheels with a later 53.3 offset on it? Will they physically safely fit and would this be detrimental in any way?
 
You'll need spacers if you go from a 23mm offset to a 53mm one. The wheels will be 30mm inboard of where they are. Do a search on wheel offset calculator -- there are plenty around.
 
PS just reread your post -- what makes you think that your teledials are 23mm offset? The teledials I had on my 84 944 were 52.5mm IIRC (and yes, I needed spacers as the original offset was 17/23mm). I suspect the offset on yours will also be 53mm.
 
Look at my reply to your other post, there's a link that shows you where to look - that's the safest way to be certain. It's cast on the back of the wheel.

Phil
 
If I do have 23.3 off set wheels and need 30mm spaces to be able to fit 53.3 off set wheels will I need longer studs and different nuts? PS where would I get the spacers?
 
Most of the usual suppliers (Jasmine, Porscheshop) do them but a new set will be about £100 a pair (so £200 all in !) [:mad:]. This width will include replacement studs etc built into the spacer.

You could get better wheels (that fit) in the first place if you factor that into the price [:)]. Or wait on e-bay.

Phil
 
www.wheelenhancement.com is a great resource for wheel pics!

"marginally" different offsets *should* be OK. keep it well into single figures though.

Oh, but you will have to have totally different offsets of you go for wider wheels! (just to complicate matters!). remember offset is measured to an imaginary centre line of the wheel, so (for instance) if you get a wheel that's 1" wider, then you'll need an offset thats 12.5mm bigger than your current offset to fit under the arch. BUT then you have to take care to make sure the extra inch inside won't rub on the shock or brake lines!

Wheels are bloomin complicated things to get to fit right. Post us your existing sizes (diameter, width and offset (which you can find cast on the inside of the wheel with the letters ET before it)) and if you find a set you like, we'll let you know if they'll fit! (and if they need spacers) We'll need both front and rear to be sure (they are usually different in some way!)
 
ORIGINAL: pikey7

Oh, but you will have to have totally different offsets of you go for wider wheels! (just to complicate matters!). remember offset is measured to an imaginary centre line of the wheel, so (for instance) if you get a wheel that's 1" wider, then you'll need an offset thats 12.5mm bigger than your current offset to fit under the arch. BUT then you have to take care to make sure the extra inch inside won't rub on the shock or brake lines!

Mike,

What you say is, I'm afraid, not true. You correctly say that the offset is measured from an imaginary line through the CENTRE of the wheel - not from the rim edge. Regardless of the width of the rim, the centre is the centre and the wheel offset is designed to bring the centre line of the wheel immediately in line with the centre line of the wheel bearing.

What IS true is that wider wheels may require the wheel to be mounted more outboard (i.e a smaller offset) of the hub to create sufficient clearance for the extra width to avoid contact with suspension parts. Similarly, it may be necessary to mount a wider wheel more inboard (i.e. a larger offset) to avoid contact with body parts.

As you say, it IS a complicated area - and, indeed, not one to be ignored or toyed with. One has to be absolutely sure of the measurements.

Best regards

Dave
 
Fronts

Part no. 993 362 124 00
FR=4700N
K1
GKALSi7MgWA
7Jx17 ET55
205/50 Contisport Contact ZR 17 N1

Rears

Part no. 993 362 128 01
FR=5705N
K7
GKALSi12MgWA
9Jx17 ET70
255/40 Contisport Contact ZR 17 N1

The above are all the numbers on the wheels

Spacers

Jasmine Porschalink JM018

Have no idea if these would fit but, £400 cash. Need to be picked up this weekend though!
 
Dave,

Basics are, if it doesn't fit to the edge of the arch, you have the wrong offset. if it fits to the arch and hits suspension part, the wheel won't fit. it's too wide!

The change in offset I quoted as an example will put the outer edge of the wheel in the same place.
 

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