Hello guys, I am looking at buying my first road bicycle. I have been riding Giant mountain bikes which I am happy with. I am looking at this Giant road bike: https://www.giant-bicycles.com/za/bikes-defy-advanced My height is 175cm and inseam 82cm. Looking on the Giant site I see the small is for 165cm - 175cm The medium is 171cm to 181cm Should I go for the small or the medium frame. Thanks for recommendations!