wheel sizes and offsets

[sc1977]

just orderd wheels for my astra g

they are 7x17 205 40 17 4 stud et 38 is this the correct offset


as im running 215 40 17s at the mo and i keep battering my arches i do not know the current offset of my wheels is there a way to measure?


ps my astra is lowered (well i put the SRi springs on it)

any thoughts?

thanks
stu

[Mazz]

Normally the offset is stamped on the inside of the wheel. Your astra should be running ET49 too..

[sc1977]

are you saying et 38 is no good for my car?

[Mazz]

TBH i've got 37's on my cav which should be 49 aswell and i've not noticed a difference, someone people say otherwise. Mines not lowered and a don't go throwing it around either, which might be why..

[Nem]

There's an Astra G wheel size thread on Astra-Sport about fitting 16-19" wheels and all the correct offsets and tyre sizes.