The technical name for "widow makers" is "Firestone RH-5°". Virtually all truck wheel outer rims were either Firestone or Goodyear designs. Firestone made (and their spin off Accuride still makes) several "lock ring" designs that have stood the test of time. The RH-5° design, though, they got wrong. It's the only design I'm aware of that doesn't allow the technician to visually see if the rim halves are solidly connected prior to inflation. For that reason, and because rust and wear weakens the finger joint connection, they can come apart violently without warning. The greatest risk is to the tire technician, but they also can come apart at a stoplight or on the move and injure anyone in their path. There are stampings on the rim, but they will be covered by the tire. I'll post some links to my pics of widow makers, and a link to an OSHA site that is real informative. Stu
http://i286.photobucket.com/albums/ll89/truckdog62563/wheels/FirestoneRH-5degree003.jpghttp://i286.photobucket.com/albums/ll89/truckdog62563/wheels/firestonerh5closeup.jpghttp://i286.photobucket.com/albums/ll89/truckdog62563/wheels/RH5concaveside.jpghttp://www.tireindustry.org/pdf/osha_Rim%20Matching.pdf
