I have 18x8 wheels with a 51 offset, whats the biggest tire I could put on without having a problem. I also dont have it dropped, and what would be the biggest tire I could put on 19s. I just popped my 2nd tire in two weeks and am thinking of either getting a new set of rims and tires or just tires for what I have now. Not really fond of low profile and dont want to pop anymore tires.

 

I also have 18x8 wheels with a high offset and I manage to do alright with 225/45ZR18 tires. However, my car is dropped 1.75" on H&R Sport springs, so you might be able to go a little bigger.