Aftermarket Wheel Weights

[Brillo]

http://www.wheelweights.net/

Please make a sticky

[Mazda_Gremlyn]

I find this site very useful, but it could do a little better with keeping all of its stats completely filled in, and maybe prvide MSRP for a set or something. They are missing a few brands on there, off the top of my head I can't recall which.

[ashu]

Another couple of useful links, with wheel specs and other stuff ...

http://www.wheelspecs.com

http://www.miata.net/garage/garagetires.html
Of particular interest at this link are the wheel weights and the calculator that tells you which sized tires (when plus 0, 1, 2) sizing will affect your rotational diameter and which won't.

[dmafe]

Here's another calculator that helps calculate the diamter of 2 tires and compares them. It also gives you a list of tires that are available in the calculated size.

http://www.1010tires.com/TireSizeCalculator.asp