bull30

I finally got tired of the run around from the various tire places about offset... So, I created a spreadsheet to help fellow Rennlisters... All you do is fill in the light yellow cells for your stock wheel then fill in the light yellow cells for the proposed wheel... The increase or decrease in width is automatically calculated... Then you can measure your Porsche to see whether or not the increased width will fit... Obviously there may be other factors but this will get you close enough to make a decision...

Page 2 of the spreadsheet includes a tire size calculator... I'll be adding a speed differential column to this spreadsheet shortly...