sorry i know its the wrong forum. i went to the other tire forum and tey gave me a chart but i don;t really understand it. its gave me everythign in mm.....just want to know what tire size are do you use for 17 inch rims. plus the width of the back rims. or if you have a even easier chart that will b great. thankz (its for my 93 rx7)

 

Search.
Find a combination that is being used by someone else and go with that.
If all you can find is the mm of a tire, go to the tire manufacturers' web page and look at the 'Recommended Tire Size' for each rim- it will give you a range- ie. 8 inch rim -225->245.
Don't forget the ever-important and often overlooked by beginners- OFFSET.
Search.

 

Here's something that might help, it'll show you any combination of wheel and tire.

http://www.bigcustomwheels.com/info_specs.jsp

 

thankz guys. after 1 hour of readin i finally figured it out. lol. just one last question, will 17x9 +15 will work on my 93 rx7....i'm scared i might have it rubbin.

 

You'll have better luck if you goto the Suspension/Wheels/Tires/Brakes section of the forum and ask there. someone knowledgeable will be able to answer you, also post the tire you will be running on that size rim as the tire is very much so a part of whether there will be rubbing or not.

 

I don't think that offset will work with your car, you should be looking at +38 to +45 for that rim size for the front or rear, how much is your car lowered?