I'm 179cm barefoot and I'm telling you Georges had a good 2cm on me, he's a legit 5ft 11in guy.
I am telling you that i met him a couple of times and he is not 5 feet 11. My cousin is 5 feet 9.5 inches tall, and him and GSP were virtually identical in height when they were standing next to each for a picture. GSP himself said back in 2011 when my cousin was posing with him for a picture here in Toronto- "What is your height GSP"? GSP replied back "almost 5 feet 10 inches". This was in 2011 before his fight with Shields. GSP was listed as 5 feet 9.5 inches tall in a couple of fights when he fought in Canada before the UFC. The UFC rounded his height up to 5 feet 10 for most of his career, and bumped his height to 5 feet 11, so everyone would think he would not be short if he ever fought at MW or Anderson Silva. GSP is 5 feet 9.5 inches tall, to a MAX of 5 feet 10 (on his very best day).