Biggest races where rider never competed
Major races where Twan Castelijns never competed in.
| # | Race | Class |
|---|---|---|
| 1 | Tour de France | 2.UWT |
| 2 | World Championships ME - Road Race | WC |
| 3 | Il Lombardia | 1.UWT |
| 4 | Paris - Nice | 2.UWT |
| 5 | Liège - Bastogne - Liège | 1.UWT |
| 6 | Vuelta a España | 2.UWT |
| 7 | La Flèche Wallonne | 1.UWT |
| 8 | Gent - Wevelgem ME | 1.UWT |
| 9 | Amstel Gold Race | 1.UWT |
| 10 | Critérium du Dauphiné | 2.UWT |
| 11 | Tirreno-Adriatico | 2.UWT |
| 12 | Brussels Cycling Classic | 1.HC |
| 13 | Volta Ciclista a Catalunya | 2.UWT |
| 14 | Omloop Het Nieuwsblad ME | 1.HC |
| 15 | Vuelta Ciclista al País Vasco | 2.UWT |
| 16 | Clasica Ciclista San Sebastian | 1.UWT |
| 17 | Tour de Romandie | 2.UWT |
| 18 | Giro dell'Emilia | 1.HC |
| 19 | Baloise Belgium Tour | 2.HC |
| 20 | Critérium International | 2.HC |
| 21 | Milano-Torino | 1.HC |
| 22 | 4 Jours de Dunkerque / Tour du Nord-pas-de-Calais | 2.HC |
| 23 | Giro della Toscana - Memorial Alfredo Martini | 2.1 |
| 24 | Driedaagse De Panne-Koksijde | 2.HC |
| 25 | Trofeo Laigueglia | 1.HC |