These aren't 3 bolt but I'm sure you could find an adaptor out there some where. The crank brothers egg beaters will NOT pop out under and circumstances unless you twist your ankle. In fact the design holds them tighter the harder you pull up on them. They feel loose, but definitely are very tight. http://www.crankbrothers.com/pedals_eggbeater2.php I've been using these on my cross, mountain, and fixie.

[EDIT]: Here is the 3 bolt adapter http://www.crankbrothers.com/accesso...hole_cleat.php