Originally Posted by
George
Clipless, I had M520s on my bike and switched to M424, much better. More platform and easier to get out of and easier on the knees. I wasn't getting the support I needed with the M520s and I don't think they are big enough for a more secure knee and foot postion.
I use the M520's on my bikes but the rear of the Tandem has the M424's fitted. Good for non clipless riders that want to ride a Tandem.
However on the New Road bike I got the A520's. They are one sided clipless pedal but it is longer than the M520's. Not quite as convenient to clip into as they are one sided but the are more comfortable on long rides due to the extra length