Tire question

[Bryce]

Let's just say I'm bad at calculating tire sizes... anyway I could use some help from my E-friends

My car came stock with 14x5" rims that had 185/60/14 tire's on them, then I upgraded rims to 15x6.5" with 195/55/15 tires on them. The prob is I get tire rub from my car being lowerd and the tire's are a little too big for my car. I want to run 205's, and that is fine but I found a deal on 205/60/15 but is that going to work? I think I need 205/50/15's, what is the diffrence and can I make them work? What does that middle number mean?

Thanks for the help on this retarded subject matter

[Parker]

Width x Aspect Ratio = Section Height
Section Height x 2 = Combined Section Height
Combined Section Height + Wheel Diameter = Tire Diameter

Example: 185/60R14 85H or 185/60HR14

185mm x .60=111mm
111mm x 2=222mm
222mm + 355.6mm(14")= 577.6mm or 22.74"

The first number is the width of the tire in millimeters, measured from sidewall to sidewall. To convert to inches, divide by 25.4 In the example above, the width is 185mm or 7.28".

The second number is the aspect ratio. This is a ratio of sidewall height to width. In the example above, the tire is 7.28" wide, multiply that by the aspect ratio to find the height of one sidewall. In this case, 185x0.60=111mm or 7.28"x0.60=4.36".

The last number is the diameter of the wheel in inches.

To figure the outside diameter of a tire, take the sidewall height and multiply by 2,(remember that the diameter is made up of 2 sidewalls, the one above the wheel, and the one below the wheel) and add the diameter of the wheel to get your answer.

[Parker]

so in other words.... the 205/60/15 tires will NOT work.... they are a taller/wider tire.....

[pin]

http://www.google.com/search?hl=en&q=tire+size+calculator&btnG=Google+Search

[Bryce]

2.5RS wrote:
Width x Aspect Ratio = Section Height
Section Height x 2 = Combined Section Height
Combined Section Height + Wheel Diameter = Tire Diameter

Example: 185/60R14 85H or 185/60HR14

185mm x .60=111mm
111mm x 2=222mm
222mm + 355.6mm(14")= 577.6mm or 22.74"

The first number is the width of the tire in millimeters, measured from sidewall to sidewall. To convert to inches, divide by 25.4 In the example above, the width is 185mm or 7.28".

The second number is the aspect ratio. This is a ratio of sidewall height to width. In the example above, the tire is 7.28" wide, multiply that by the aspect ratio to find the height of one sidewall. In this case, 185x0.60=111mm or 7.28"x0.60=4.36".

The last number is the diameter of the wheel in inches.

To figure the outside diameter of a tire, take the sidewall height and multiply by 2,(remember that the diameter is made up of 2 sidewalls, the one above the wheel, and the one below the wheel) and add the diameter of the wheel to get your answer.
Thank you so much, this helped greatly! I'm going to go with 195/50/15's thanks a ton for the info!

[Parker]

anytime.....

[wa2fastcamaro]

Whenever I change tire sizes I use this web site

http://www.miata.net/garage/tirecalc.html

It will tell you what wheel and tire sizes are closest to stock.

Mike

[weshole]

Lank you must also take into consideration the backspacing of the wheels you put on the car. If that brings them too far in, the no matter what tire you put on there, you will get rub.