Proline actually used to have very nice diagrams on their website with wheel width, overall diameter, bead mounting diameter. They never included offset measurements though. And now they've removed those diagrams and any mention of measurements for most wheels from their site. They do have the "what Traxxas model it fits" though. I agree it would be nice to know these things and would like to see this information online when researching. On the packaging is a bit much and I wouldn't ask for it as I know what I want before going to the lhs since it won't be traxxas and they'll likely have to order it anyway.