I have a 98 4 door blazer. No lift on it. I want to put tires on it (235/75/15 stock) and I changed my rims from an 15x8 inch rim compared to a 15x7 inch. Lookin for anything in the 30's. Any suggestions/threads you can lead me to??

 

You might try this. https://www.wheel-size.com/calc/

You also might see if when buying tires if the shop will test fit them for you. I had them do that for me when I was trying to decide between 30x9.5R15s and 31x10.5R15s for my slightly lifted Blazer. I went with the 30s because the 31s would rub the frame when the steering was at full over. I later realized that installing the 31s would have further increased my effective rear end ratio and I was glad that I had gone with the 30s.

I think I've heard of people installing 30s on Blazers without lifts so hopefully someone can chime in with first-hand experience.

 

We need a bit more information from you in order to help. Are your new rims lower backspace than the factory rims? Not sure if your Blazer is 2wd or 4wd. They each have different backspaced factory rims (4.5" for 2wd, and 6" for 4wd). A lower backspaced rim will push it further outboard on your truck, making the tires stick out, and increasing the chances of it rubbing on the fender, even with smaller tires.

I ran 255/70/15 (29.3" tall) on my stock Blazer for years and had no rubbing issues. On factory rims, most people are able to run 30" tall tires on a stock truck without any rubbing concerns, even when offroading. Bigger than that and you'll almost certainly need to do some modifications to make them fit without rubbing.

 

My blazer has lower backspacing by about .75 inches. 4wd blazer. 4 doors

 

That’s a neat little tool lol.