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How to find wheel offset
Posted: Thu Jan 19, 2012 1:33 pm
by LilJen
Hi.
I'm having issues with my new suspension (its sits too close to the wheels to be able to lower it)
To be able to try and resolve it, I need to find out the offset of my wheels. I've looked up on the internet but cant seem to find anything. On the wheel I can see the width etc, but don't seem to be able to find the offset. Is it stamped on them, or is there a standard size for them?
I have 16" Genuine Alpinas.
The tyres are 205/50 which seems to be the size others have used, so I didn't think they would cause a problem.
Thanks
Re: How to find wheel offset
Posted: Thu Jan 19, 2012 1:58 pm
by randomspeedfreak
LilJen wrote:Hi.
I'm having issues with my new suspension (its sits too close to the wheels to be able to lower it)
To be able to try and resolve it, I need to find out the offset of my wheels. I've looked up on the internet but cant seem to find anything. On the wheel I can see the width etc, but don't seem to be able to find the offset. Is it stamped on them, or is there a standard size for them?
I have 16" Genuine Alpinas.
The tyres are 205/50 which seems to be the size others have used, so I didn't think they would cause a problem.
Thanks
the et is the offset of the hub mounting face relative to the centerline of the wheel. so for example if you have an 8J wheel, you would measure 4 inches towards the mounting face from the back of the rim, the distance from this point to the mounting face is the offset (in mm)
Re: How to find wheel offset
Posted: Thu Jan 19, 2012 2:06 pm
by Rav335uk
What suspension have you had fitted???
Alpina 7j wheels are ET 28 iirc.
These should fit with no issues at all on E30's.
Re: How to find wheel offset
Posted: Thu Jan 19, 2012 2:19 pm
by LilJen
Ive had a Gaz GHA coilover kit fitted. Its all on ok, and rear is set up nicely, but if I drop the front anymore it will rub the tyre.
Re: How to find wheel offset
Posted: Thu Jan 19, 2012 2:26 pm
by Rav335uk
On the Gaz coilovers you need to run a shorter spring, and not the ones supplied with them.
There has been a few issues on here already with their coilovers and this seems to be the main issue with the longer springs supplied.
Re: How to find wheel offset
Posted: Thu Jan 19, 2012 2:34 pm
by LilJen
I've gone through a very reputable company to get them, but they never mentioned anything about springs, unless the wires have crossed somewhere, and manufacturers sent out the wrong ones.
Re: How to find wheel offset
Posted: Thu Jan 19, 2012 3:04 pm
by Jhonno
With coilovers you tend to need to run a spacer or lower offset wheels. End of. A shorter spring is a bit of a bodge and will reduce bump travel available.
It's due to the spring seat position being changed.
Re: How to find wheel offset
Posted: Thu Jan 19, 2012 4:55 pm
by Rav335uk
That's what the problem is Dan, the seat for the spring being low and catching..
As Dan said, it's either spacers or as I said, a shorter spring.
Re: How to find wheel offset
Posted: Sat Jan 21, 2012 12:43 am
by LilJen
What sort of size spacers can you get away with before it starts causing any issues? I will try them 1st and then if that doesn't work, I will have to get shorter springs

Re: How to find wheel offset
Posted: Sat Jan 21, 2012 1:52 pm
by Rav335uk
I think the majority who run them are between 5-10mm. I think you should be fine with 5mm