Here's a useful tool to determine the effect of changing your wheel width and offset. It will show: (1) the clearance between the inside of the wheel and the strut housing and (2) how far the outside of the wheel edge will extend or retract.

Wheel Offset Calculator

If you reduce the inner clearance too much or push the wheel out too far, the tire might rub or not fit at all.

I'm not affiliated with this company or their website, but I thought it would be of interest to this forum.

Stuart

 

Thanks, seems like a very handy tool to use, will help a lot to find out what offset to have on bigger wheels

Kay