Senior Member
Join Date: May 2011
Location: the LOU, Mo
Posts: 584
Bikes: Bianchi Nuevo Alloro, Cannondale ST400, Fuji Palisade, GT Timberline FS, Raleigh Technium 420, Schwinn Moab, Schwinn Passage, Schwinn Tempo, Specialized Sirrus Elite (aluminum), Specialized Sirrus Triple (steel), Trek 7.6, Viner Road Record
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I use both , depending on how I feel like riding.
THe red ones can feel VERY sloppy, depending on how tight you have the actual pedals set. You have to swing your foot out a lot farther to get them to unclip. THe black, OTOH, can feel so solid that you can't adjust at all, but as soon as you start to arc your foot outwards (or inwards) you'll pop out.
Keep in mind, I'm using these on multiple pedals from different manufacturers:
Original LOOK Deltas
Arc LOOK 8/12
Shimano PD-6401
Forte' CR-150
If you really want your feet to stay in one position, you probably would be happier with the black ones.