I have known for many years that I need pedals that force my feet to toe-in. Unlimited float is, for me, a no-go. In fact riding with float will take me to the surgeon's saw quickly. I rode traditional toeclips, slotted cleats and straps pulled tight long after clipless came around until finally a salesman told me about the LOOK Delta pedals and the black (no-float) cleat instead of just lecturing me one more time about how all with knee issues need God's gift - float.
So I still ride LOOK Delta copy pedals (Performance/Nashbar/Wellgo) and black cleats on my good bike. The traditional setup on all my fix gears. (On of my re-occurring nightmares is pulling one foot out riding fix gear on a steep, fast hill spinning 180 RPM with one foot. Spinning that fast, it is impossible to tell what angle my foot is at and I am certainly not going to look down! Traditional cleats sometimes pull out at those speeds with toeclips, but TG for straps!
It looks to me like the newer road Shimano SPD-?? and the LOOK Keos are both newer, sexier versions of the old Look Deltas. I assume both have no-float cleats like the Deltas. When my current pedals expire, that will be how I will go if indeed the no-float option is tstill there. (It will be a while. The Delta copies get getting cheaper and cheaper so I stockpiled quite a few.) I could use the Speedplay Zeros. For me it is a simple issue of "why?". It would be a 4th cleat/pedal system and not cheap. Maybe when I go through my last Deltas. But things will be different out there in the market in 10 years. So we will see.
I find that a good adjustable no-float pedal allows me to set the toe-in so my knees track straight. Also that I cannot force my feet to that toe-in on a float pedal - that the force required to do that is exactly what my knee cannot tolerate at all. (I can sorta make limited float pedals work. I've taken SPDs and set them at maximum toe-in to force my feet. Not ideal and accidental clip-outs happen easily so I set the release at the max. I do this for my gravel bike to get better shoe options.) I have been riding with forced toe-in the past 150,000 miles since my knee issues started 40 years ago. They are good for many thousands more.
Ben
Ben