Pedal thread smaller than 9/16"

Do any of you know of pedals with a smaller diameter than the standard 9/16" thread, it's not actually on a mountain bike its an exercise bike but thought you might be able to steer me in the right direction.
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Your best bet might be to get a 1/2 to 9/16 adaptor and then use 'normal' pedals - it'll push the Q out slightly but for an exercise bike I don't know that that will matter much.