Join Date: Mar 2003
Location: Beaufort, South Carolina, USA and surrounding islands.
Bikes: Cannondale R500, Motobecane Messenger
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9/16" are the normal SPINDLE size for cottered and cotterless cranks. If you don't know what I am talking about, look at your bike, particularly the crank arms. If you can remove the crank arms, then you can use the 9/16" pedal. If the crank arms are bent into the crank axle, one solid piece, the use 1/2" spindle pedals. Either way, use a 15mm wrench to install and uninstall the pedals.
If any of that confuses you, have a bike shop replace the pedals.