Clowning around on a Borealis Yampa. Clowning around on a Borealis Yampa. February 11, 2014 Ryan Comments 0 Comment Fatbikes. If you aren’t having fun, you’ve missed the whole point. The Borealis Yampa is a great looking ride. I’m hoping to test a set of their Carbondale rims here this spring- though I won’t likely be wearing a clown costume.