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...in the earliest years of clipless, I had a lot of trouble finding something with enough "float" to accommodate my various foot and knee issues. I realize they fixed that, somewhere along the way. But by then I was heavily invested in clips and straps, so I lacked further incentive to experiment. But I do reiterate that you are probably much, much safer on a bicycle going fast, if you can keep your feet on the pedals when you hit a big bump or a pothole.

And those track guys use reliable foot retention for a reason.