true,but certain tire manufac. make tires that have a small lip that sticks out to help protect the rim..i know that the second number is what makes the biggest difference in sidewall height,i was just saying that a 215/225 45 tire would have different sidewall heights even though the aspect ratio was the same

"Youth ages, immaturity is outgrown, ignorance can be educated, and drunkenness sobered, but STUPID lasts forever."-Aristophanes. --93 pgt,headers,intake,borla=14.9 1/4mile