I have read this on forums too and also read where several guys rebutted saying they have ran them on the street for a long time with no problems, so who you gonna believe? Come to think of it I know a guy that has had a set of green bearings on his street driven big block 70 Cuda for several yrs. with no trouble. I do agree that the original tapered wheel bearings are a better design for a street car but also remember that a lot of Ford truck rearends used roller type wheel bearings and lasted a long time.