| Results - Semi final | |||||||
| Heat | Rank | Bike | Name | NOC | Gate | Time | Mark |
| 1 | 1 | 148 | VAN GENDT Twan | NED | 39.609 | Q | |
| 1 | 2 | 219 | ANDRE Sylvain | FRA | 39.738 | Q | |
| 1 | 3 | 142 | OQUENDO ZABALA David | COL | 39.983 | Q | |
| 1 | 4 | 165 | DUNSWORTH Matthew | AUS | 40.679 | Q | |
| 1 | 5 | 195 | MARTINEZ Lorin | FRA | 40.809 | ||
| 1 | 6 | 157 | BRETHAUER Luis | GER | 40.988 | ||
| 1 | 7 | 139 | FURLAN Mattia | ITA | 43.116 | ||
| 1 | 8 | 147 | TEULLET Denis | FRA | 44.757 | ||
| 2 | 1 | 134 | FIELDS Connor | USA | 38.958 | Q | |
| 2 | 2 | 190 | LEJINS Kristers | LAT | 41.998 | Q | |
| 2 | 3 | 187 | KRISTERS Taims | LAT | 43.256 | Q | |
| 2 | 4 | 189 | LAUSTSEN Niclas | DEN | 44.037 | Q | |
| 2 | 5 | 173 | GOODWIN Darryn | AUS | 57.730 | ||
| 2 | 6 | 205 | OSTETI Hugo | BRA | 1:24.096 | ||
| 2 | 7 | 160 | DALFARRA Leandro | BRA | 1:44.311 | ||
| 2 | 8 | 207 | SHARRAH Corben | USA | DNF | ||