In 2007, Wilmann finished third in the Norwegian National Road Race Championships, behind Alexander Kristoff and Thor Hushovd.

[2][3] But he became the under-23 road race champion, after beating Stian Sommerseth, Edvald Boasson Hagen and Kristoff.

[4] After riding several years with the Norwegian outfit, Joker–Bianchi, Wilmann signed a two-year contract with the Dutch team Skil–Shimano in 2010.

He broke off the contract in late 2010 due to dissatisfaction, and then returning to his former team, Joker–Merida.

After only one year "back home", he signed for the Danish team Christina Watches–Onfone in late 2011, riding together with experienced riders like Michael Rasmussen and Stefan Schumacher.