Simpler Cycling
Briefly

"Many clip-in pedals provide float, meaning they have some wiggle room side-to-side, which is gentler on your knees. The downside is that you need special shoes and your feet are stuck to the pedals until you decide to un-clip..."
"8 Degree Pedal created a flat pedal (no clips or special shoes required) with internal springs that offers float to reduce knee soreness and injuries. You get the 100% freedom of a normal tennis shoe..."
Read at time.com
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