size question
 

i have a 88 rx7 vert...stock suspension..i dont plan on lowering it..sits low enough for me already and roads r terrible in indiana..i wanted to get some sportmax 002 in 15s..i was jw what specs for the rims and tires i need to get..i dont want a super low pro tire..i want a little meat on them..i tired searching but i dont full understand all the numbers and offsets n stuf on rims and tires..thanks..heres a photoshop of what im looking at getting....
http://i103.photobucket.com/albums/m...yr/newrims.jpg

anyone?