wheel and tire calculator

[Manny203]

good site to compare different setups

http://www.rimsntires.com/rt_specs.jsp

[*infamous*]

While were on the topic, its not a bad idea to know the long hand version.

To find a tires overall diameter, do the following.
Ex1: 275/40/R17

275 = tire width in mm. Must convert it to inches.
275 / 25.4 = 10.8

10.8 is how wide the tire is. Multiply this by the profile percentage.... in this case 40. Convert it to a percentage aka put a decimal in front.

10.8 x 0.40 = 4.32

4.32 = the sidewall height in inches. Since there is sections of sidewall, multiply that by 2.

4.32 x 2 = 8.64

8.64 is the total sidewall height.
Now add the wheel size.

8.64 + 17 = 25.64.

This tire assembly will be 25.64 Inches tall.

I have highlighted like measurements for your viewing pleasure.

Hope this makes sense!

This calculation has been particularly useful for measuring wheel/tire combos for sensitive awd setups and cars with TCS to worry about! Especially cars with staggered fitments!