31.8mm vs 35mm

veagnox Posts: 77
edited December 2016 in MTB general
Hi guys, here we go with a total noob question: What there numbers (31.8mm/35mm) mean on handlebar? Are they bar end diameter, or bar center (which goes to stem) diameter?

And I also want to know what are the pros/cons of 31.8/35 bars and stems

Waiting for your replies, thanks for attention