Best winning percentage by franchise in NFL history:
Ravens .574
Cowboys .574
Packers .572
Bears .553
Chiefs .553
Dolphins .553
Vikings .551
Dolphins .550
Ravens .574
Cowboys .574
Packers .572
Bears .553
Chiefs .553
Dolphins .553
Vikings .551
Dolphins .550
Comments
How many years would the Cardinals have to go 17-0, and the Bears go 0-17 for the Cards to have a better lifetime record?
I don't remember the exavt answer, but it was like 2 decades, I think.