Riveted center discs. Every manufacturer’s catalog of the 50s/60s had disclaimers that said warranties would be voided if radials had been mounted. (Edit - this is specific to the 17.5”, 19.5”, and 22.5” sizes. I’ll have to look at the 16.5s, but think by the time they came into wide use welding had probably become the practice). I have an SAE study that was done for Budd that shows the increased lateral forces radials transmit to the wheels. To combat this problem the manufactures began fully welding the disc to the rim during the 1970s, and on the big trucks they fully redesigned the 22.5s to eliminate what were called “well welded” designs (along the drop center) in favor of “ledge welded” designs. Stu
Last edited by truckdog; 02/24/2020 6:32 PM.
