The term "split rim" can be misleading. The widow maker is a true split rim because it breaks apart right down the middle of the rim. Pictures are posted in the F-500 thread. If you look closely at the pictures you'll see that the technical name for the widow maker is "Firestone RH-5°". There are also other kinds of rims (too many different designs to list their names) that split at the face of the wheel. These are commonly called "lock ring" or "split ring". They are still safe to use if not damaged, badly rusted, etc. All multi-part rims should be handled with care and serviced using a cage. Stu