Pedals with float?

[BikeMomma]

With cleated pedals (aka "clipless") it's how much wiggle room you have when you are clipped in. Some pedal systems will let you lock your foot into one spot (no float) and some won't lock you in at all (lots of float, like in Speedplay Frogs). There are a bazillion variations of float and you can adjust the tension and float on a lot of the pedals to exactly what you want.

I have Speedplay Frogs, and the lack of any tension and having tons of float makes my grumpy knee and hip very content. (no moving parts in the Frog system, and I love that kind of elegant engineering)

Like she (and she) said. I'd just add that Speedplay also has the Speedplay Zero (road), which offers either option....float, no float, or you set it for just your own degree somewhere in the middle. What's also handy is that there is no "right side" -- you can clip in from either side, unlike others you have to flip up to clip in. I ride with the Zero's (titanium) on full float on my Fuji and really like them. I have the stainless steel ones on my Cannondale, which I mainly use on the trainer. I used to use Aerolites, which are fixed. Like the Speedplays, Aerolites have awesome clearance when cornering low.

Hope all that helps! Probably a bit too much info, but you can really never get enough in this sport.
~BikeMomma