Working Out Offsets - HELP

[Benji_DuB]

Im buying a new set of alloys for my mk3 but need to find out the offset of my wheels which i have on now, so i can work out how my new wheels will sit/what i will need to do with the arches (pulling and flaring) when i drop it. I Plan on gettin 7.5" Front and 9" back, but because i dont know my offsets of my wheels at the mo i dont know the what correct offset are needed for the new ones. The Alloys on my car now are 8 inches wide front and back as the tires are 205, but i havnt got a clue on how to measure my offset.
I know that the offset is the difference between the hub and the alloy itself, but how do i measure it when the wheels are on the car??, finding it a bit confusing and stressful.

[avengedslayer]

is the offset stamped on the inside of the wheel? it could say ET35 or summet?

[Benji_DuB]

yesss man sorted et35, took the wheel off and had a gander was stamped behind the spokes sweeettt.

[spunkymonkey]

If you get 9j on the rears you need something like ET25 minimum or it will hit the shocks. Most 9j rims come ET15.

[Benji_DuB]

if its 9" is there more alloy towards the shocks?? and then the offset dertermines the distance of that from the shock?? is there a way of measuring that?

[shepgti]

if its 9" is there more alloy towards the shocks?? and then the offset dertermines the distance of that from the shock?? is there a way of measuring that?

the distance towards the shock isnt the issue, the lower the et (offset) the more the wheels will stick out the arches

[Benji_DuB]

Planning on having the backs sitting on 205/40 so a slight stretch to allow for the arches, also getting them pulled and may get a flare if its needed.

Decided to get 7.5" at front with et20 sitting on 195/45, and back 9" at et25 with 204/40. Sound reasonable? (16" Rims)

Ive made measurements and itl stick out and extra inch at the back basically, plus a cm for the offset, which is just right. The front will push out an extra 3 mils so no change in that which hopefully means it will fit nicely under the arches.

The wheels come from the manufacturer with the highest offset of 25 the lowest in 15 but i dont want it to stick out too much, adds more works for the arches.

[spunkymonkey]

if its 9" is there more alloy towards the shocks?? and then the offset dertermines the distance of that from the shock?? is there a way of measuring that?

the distance towards the shock isnt the issue, the lower the et (offset) the more the wheels will stick out the arches

It is on a 9j rim.

[Wayne]

Planning on having the backs sitting on 205/40 so a slight stretch to allow for the arches, also getting them pulled and may get a flare if its needed.

Decided to get 7.5" at front with et20 sitting on 195/45, and back 9" at et25 with 204/40. Sound reasonable? (16" Rims)

Ive made measurements and itl stick out and extra inch at the back basically, plus a cm for the offset, which is just right. The front will push out an extra 3 mils so no change in that which hopefully means it will fit nicely under the arches.

The wheels come from the manufacturer with the highest offset of 25 the lowest in 15 but i dont want it to stick out too much, adds more works for the arches.

Et25 should be ok, et15 will need a lot more work to the arches.

[spunkymonkey]

Id go for et25 then space slightly to suit if need be.