You may want to check out this thread http://www.bikeforums.net/archive/in.../t-677820.html.

The 24s are like regular platform pedals, meaning you could add reflectors, toe clips, cages and they're wider. The 30s are streamlined.

These are the updated version of the clipless shoes I use, but I use them in spin class only. http://www.zappos.com/shimano-sh-m08...zap_brand_page Easy to walk in, but I'm no fan of clipless overall.