stupid questions about offset and centerbore

[thejimlab]

Offset is measured in cm's right? And the centerbore of our e30's in 57.1, measured in mm's right? Thanks.
Jim

[Victell]

.

Japanese and European offests are usually in millimeters. ex: 25mm.

[T.Dot E30]

all offset is measured in mm.

backspacing...which is slightly different than offset is measured in inches

[thejimlab]

what is the backspacing on an e30 wheel?

[Mystikal]

The centrebore of the E30 is 57mm, a wheel going on the E30 is 57.1mm

[Mastrcruse]

Back from the dead. I just bought new wheels and me nor the PO know the centerbore. These were on a V-dub, I believe so hopefully I am not completely fucked. Didn't think of centerbore until now when I was washing them.

How do you measure centerbore by yourself w/ no machine or box? I'm a picture learner so if you don't mind putting pics up that would be great.

[blueapplesoda]

i know a couple vdubs have the same centerbore -- 57.1mm as our e30s...

could you just use like a caliper or ruler to find the width of the hole?

[Mastrcruse]

Which hole am I measuring though?

[MrK]

The one in the center, in the middle of the four smaller holes you put your nuts in.



That sounded weird.

[Mastrcruse]

haha, okay where if I had a single lug nut in the middle I would put it in this hole. I think we are on the same page. Thanks

[Mastrcruse]

Just eyeing it on the outside of the wheel w/ a ruler it looks like its 57mm but on the insideof the wheel w/ a ruler widest daimeter hole is almost 70mm

[Mastrcruse]

Hopefully you can see it. The red arrow is the hole that is measuring 57mm. I don't have kopis these are just for an example. The the hole, if you turn the wheel over on the back is about 70mm.

[MrK]

That's the one. Measure it at its narrowest diameter. It should be 57.1mm.

[Mastrcruse]

Okay cool. I can't get the ruler down into it but from eye balling it, it is very close to 57mm.

[Mastrcruse]

Sorry, but is there a tool that is small enought to get into that hole and get an exact reading? I can't get the ruler down there and when I read it, it is about 2" away from the hole. Are there any sizes that are close that it could be with an accurate measurement?