I was just checking the site, and the ET Street slicks I have for my 16x7 say the minimum is 8". But for the ET Street radiuls it says the minumum rim width for the size tire is like 9.5". The rims I am looking at getting are 18x7 or 17x7. Is this going to seal correctly or am I going to have problems if I end up running at a high mph if I use the tires that require a 9.5" minumum on a 18x7 or 17x7 wheel?