Robert Cobcroft 30 July 2015 Bikes, Bike Restoration, Bicycle Technology, Bicycle Racing, Bike Frame Building Leo Estermann Zurich Frame Builder Track Pursuit Funny Bike 1981 Robert Cobcroft 30 July 2015 Bikes, Bike Restoration, Bicycle Technology, Bicycle Racing, Bike Frame Building The history of Zurich frame builder Leo Estermann.