Rep Power: 424

This is basically the same thing as the Tire Calculator at the top of the page except this will find the difference in the edges of your new rim in relation to the stock one. It's universal so you could use it on any car.... (but if someone's gonna post it on another forum could you at least say where it came from). The sign convention in it is such that positive offsets can be entered without any signs. If you're using negative offsets, you'll need the negative sign although no one on here should be using negative offsets. Just fill in the 2 boxes at the top and it should spit out the numbers at the bottom. I'll call this Version 1, since I'm probably going to add some things to it when I get my new rims and have the rims off, I'll measure some more things so you can find out how much clearance you'll have in certain places, and also find out if your rims are going to hang out the sides of the fenders.


Offset Calculator
You should get an Excel spreadsheet to open. I don't know how to do it with a fancy applet, so you'll have to live with my ghetto version, but it works, which is what counts. It's kind of simple now, but it will do more in the future once I have the right info to do it.

 
Rep Power: 0

Nice, very handy.

 
Rep Power: 0

are these 100% accurate? no offense, just want to make sure I go right tire.

thanks,

 
Rep Power: 424

It's pretty much dead on. I checked the equations 4 times with a variety of different values and it works like a charm. I suppose if it bugs you that much, I could drag out the millimeter to inch conversion to a couple more decimal places, but in millimeters, it's exact.