Originally Posted by
BCRider
As time passes and you either ride harder or the cleats and pedals wear you may find you need to screw the clickers in a click or two. But that'll take months if not years from the pedal and cleat wear part. So if you find yourself ripping your feet out on the up pull then congrats on a successful training season...

Found this myself- but some of my pedals are old-having been bought from around 10 years ago up to just last year. I use the M520's on the MTB's and A520's on the road bikes. Over the years I have had to tighten the settings on the pedals and never have a problem unclipping. My main problem is pulling the foot out on the upstroke of the pedal.
Then earlier this year I bought new shoes- fitted new cleats at the same time and went out for a ride. First stop was about 5 miles into the ride and I did not unclip. The foot just did not come out with my normal twist of the heel. Went round in a circle and forced a foot out and stopped. Then realised- All the adjustment was not to take up slack in the pedal- or me getting stronger ankles-It was those cleats wearing out.
But eventually- you will find that you have to tighten the adjustment screws. You will want to be tied more firmly to the bike.