do nike's run small or big

Should I buy these Shox's a size up or are they TTS? I usually buy one size bigger with Nike, but I read somewhere these fit little bit big. True or false? :

Armed Police to Protect Tourists on French Beaches do nike's run small or big Union Support For U.K.'s Corbyn Weak: Poll do nike's run small or big Obama Approves Broader Role for U.S. Forces in Afghanistan do nike's run small or big Saudi Arabia: Man Shoots Doctor For Assisting Wife's Labor do nike's run small or big

do nike's run small or big Gold White Black Red Blue Beige Grey Price Rose Orange Purple Green Yellow Cyan Bordeaux pink Indigo Brown Silver