Im confused! I ordered some rims and I think they said that I had 40 profile tires soming with my rims! Is it the lower the number the lower the profile, or the higher the number the lower the profile! Im not sure! Please help!

 

XXX(width of the tire in mm I believe)/XX(sidewall height, number is a percent of the width)/Rxx(diameter of the rim in inches)

So a tire with a rating of 200/50/R16 for example would be 200 wide, 100 high, and 16 inch rims.

 

http://www.miata.net/garage/tirecalc.html this should go in your favorites. LOL.