Anytime someone considers a clipless pedal for a fixed wheel bike, the number one consideration has to be the reliability of engagement. This is doubly true if riding brakeless.
Unlike a freewheel bike, where one can stop pedaling and re-engage, re-engaging to a moving crank is extremely difficult, leaving you with no means to control the bike, and a spinning a crank looking for an ankle to club.
Of couse you can increase latch spring tension, but keep in mind that there's a narrow window for disengaging as a fixed wheel bike comes to a stop, and an overly tight cleat can have you providing entertainment for the locals.
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