Originally Posted by datsme40

The 324 is the size if a regular stock pedal and with the clip on the other side run a little heavy. I'm a bigger guy and new to road riding,so the idea of clipping out well ahead of a light and still having a platform to ride on was appealing to me. I got these for the hybrid that got me riding again. Just moved them to my new commuter bike (specialized tri cross).

The 520 platform is a little smaller and oval and the pedal is much lighter. These I have on my road bike.

I won't tell you that it's the only way to go. The 'increased efficiency' arguments aside (not sure I believe it for the average joe puttering around), I prefer to be clipped in because my big feet will slip occasionally.

as you can tell, there are a lot of opinions. I personally would not walk around all day in biking shoes but one could. I keep shoes at work to change into.

My 2 cents.

Datsme