tires and wheels Offset, Lug Nuts, And Please Help My Brain

[gliding_serpent2]

I am about to get a set of EXIP (VW schirocco) wheels that are 13x6 with et33.  I currently have 2002 alloys (13x5, et ~29) for my Tii with original brakes, and original unrolled fenders. 

 

If my brain works right, tires being unchanged (lets say 185's) that puts the wheel 4mm closer to the brake/suspension side of the car, and 4mm farther away from the outer wheelwell (or 7mm respectivly if my 2002 alloys are ET26).  Thus, to match the original placement, I need a 4mm (or 7mm) spacer... which is probably not worth my effort.  Correct?  I also assume these will clear the Tii brakes.   

 

Now, the seller has lug bolts in about 24mm, and about 28mm.  Does the length matter?  Should I ask for the longer lugs as they will just give me more headroom just in case?  My understanding is that I may need the longer bolts as my desired offset is less, not more, thus meaning the lug nuts will have less to bite on to, especially if I use a spacer. how long are OEM bolts?  And what is the size difference between oem alloy vs steel bolts/nuts?

 

Thoughts.  I just want to confirm my head is on straight as I am new to this. 

 

 

Edited August 13, 2013 by gliding_serpent

[Tommy]

Sounds that your brain works fine. One thing though - You say tii with original brakes - I don't think you need those lug bolts at all. You should have studs mounted on wheel hub and use nuts that are right for the wheel, hopefully the ones you have fit.

 

You can use 4mm spacer with original studs but 7mm is too much. Assuming the wheels are not especially thick around the studs.

 

  Tommy

[steve k.]

You are actually moving the edge of the rim 14mm closer to the strut.  Your new wheel is 25 mm wider, so that is 12.5 + 4mm of the offset.  

 

steve k.

[Tommy]

You are actually moving the edge of the rim 14mm closer to the strut.  Your new wheel is 25 mm wider, so that is 12.5 + 4mm of the offset.  

 

steve k.

But looking at tire tread he figured it right. Same tire, only offset matters. 12.5+4=14 Hmmm? 

 

 Tommy

[steve k.]

But looking at tire tread he figured it right. Same tire, only offset matters. 12.5+4=14 Hmmm? 

 

 Tommy

I have not had enough coffee yet. 16.5mm The tire will spread more on the wider rim. the tread will be close, but other parts of the tire will not.

[gliding_serpent2]

Sounds that your brain works fine. One thing though - You say tii with original brakes - I don't think you need those lug bolts at all. You should have studs mounted on wheel hub and use nuts that are right for the wheel, hopefully the ones you have fit.

 

You can use 4mm spacer with original studs but 7mm is too much. Assuming the wheels are not especially thick around the studs.

 

  Tommy

I do have the correct alloy studs, just need to confirm that the seller does also. 

 

in regards to a 7mm spacer, how long are oem studs, and do you have advice for something longer? (3.0csl are NLA according to another post).  I ask because I anticipate needing 4mm up to 7mm (1/4 inch spacer) for my e30 bottlecaps (not yet in my hands), and these wheels if I get them.   

[RayC911]

I do have the correct alloy studs, just need to confirm that the seller does also. 

 

in regards to a 7mm spacer, how long are oem studs, and do you have advice for something longer? (3.0csl are NLA according to another post).  I ask because I anticipate needing 4mm up to 7mm (1/4 inch spacer) for my e30 bottlecaps (not yet in my hands), and these wheels if I get them.   

I don't think you'll need longer studs or spacers for either set of wheels. Unless the EXIP wheels have a very flat or concave face.