How do you know what offset you need for your alloys?

Question

Its a corsa B and Ive narrowed the search for alloys down to either wolfrace suzuka (offset 40) or TSW Freeze (offset 35). Or could either be fitted? Any help appreciated.

Answer 1

You should use the same offset as the standard wheels - changing the offset changes the loads applied to the suspension and steering components, and could lead to failure of those components.

The offset will be stamped near the centre of your standard wheels, preceded by the letters "ET".

Answer 2

It's written on the steel it says J and then a number or a number then J