RT @fietsprofessor: 'In flux' versus 'Inertia' https://t.co/tWZ9TlYnhS

Oct 27, 2016

‘In flux’
versus
'Inertia’ [pic.twitter.com/tWZ9TlYnh...](http://pic.twitter.com/tWZ9TlYnhS)
— Cycling Professor (@fietsprofessor) October 6, 2016