Biggest races where rider never competed
Major races where Xaf Houwers never competed in.
| # | Race | Class |
|---|---|---|
| 1 | Tour de France | WT |
| 2 | Milano-Sanremo | WT |
| 3 | World Championships ME - Road Race | WC |
| 4 | Giro d'Italia | WT |
| 5 | Paris - Roubaix | WT |
| 6 | Il Lombardia | WT |
| 7 | Paris - Nice | 2.UWT |
| 8 | Liège - Bastogne - Liège | WT |
| 9 | Vuelta a España | WT |
| 10 | Ronde van Vlaanderen / Tour des Flandres ME | WT |
| 11 | La Flèche Wallonne | WT |
| 12 | Paris - Tours | 1.HC |
| 13 | Gent - Wevelgem | WT |
| 14 | Tour de Suisse | WT |
| 15 | Amstel Gold Race | WT |
| 16 | Critérium du Dauphiné | WT |
| 17 | Tirreno-Adriatico | WT |
| 18 | Paris-Bruxelles | 1.HC |
| 19 | Volta Ciclista a Catalunya | WT |
| 20 | Omloop Het Nieuwsblad ME | 1.HC |
| 21 | Vuelta Ciclista al País Vasco | 2.UWT |
| 22 | Clasica Ciclista San Sebastian | WT |
| 23 | Tour de Romandie | WT |
| 24 | Giro dell'Emilia | 1.HC |
| 25 | E3 Prijs Vlaanderen | WT |