One of the nicest tire size calculators I've found is at
http://www.1010tires.com/TireSizeCalculator.asp. It lets you compare current size to others for replacements or inching up or down.
Now, with that I have been able to determine that I can replace my existing 225/60R16 tires on my factory wheels with a set of 245/45ZR18 tires on a new set of ADR Sterling 18 wheels with a 38mm offset.... (maybe) and the diameter is nearly identical (0.23% difference) however, my question is this;
The new tires I'm thinking about getting (already have the rims) are exactly 20mm wider and the new rims have 38mm offset. Will these actually fit OK? Or must I stay with a tire width closer to the original (225 or 235).
I do not know the factory rim offset and whether or not the new setup I'm after will touch anywhere.
Any suggestions?