| 03.09 | |  UCI MTB World Cup XCO - Lenzerheide (short circuit) | CDM | |
| 03.09 | |  American Continental Championships - XCM | CC | |
| 04.09 | |  Venezuela National Championships - XCO | CN | |
| 04.09 | |  Italian National Championships - XCM | CN | |
| 04.09 | |  Huskvarna MTB-Tour | 2 | |
| 05.09 | |  Abierto Internacional - XCO | 1 | |
| 05.09 | |  XI Maraton BTT Sierra De Cazorla | 2 | |
| 05.09 | | UCI MTB World Cup XCO - Lenzerheide | CDM | |
| 05.09 | |  MTB Liga - Powered By Allbike #3 - Sorø | 2 | |
| 11.09 | | Mythos Primiero Dolomiti | 2 | |
| 11.09 | |  Polish National Championships - XCM | CN | |
| 11.09 | |  Namibian National Championship - XCO | CN | |
| 11.09 | |  Dutch National Championship - XCO | CN | |
| 11.09 | |  Copa Catalana Internacional - Vallnord | 1 | |
| 11.09 | |  Karl XII rittet | 1 | |
| 11.09 | |  Slovak National Championship - XCC | CN | |
| 11.09 | |  International MTB Marathon Malevil Cup - XCM | 2 | |
| 11.09 | | CST Singletrack MTB Marathon Kosice | 2 | |
| 12.09 | |  Greek National Championship - XCM | CN | |
| 12.09 | |  24. MTB Cross Country "Rund um den Roadlberg" | 2 | |
| 12.09 | |  International MTB Bundesliga - Vulkan Race Gedern | 3 | |
| 12.09 | | Izomat MTB Cup 2021 - Mesto Touskov | 1 | |
| 12.09 | |  Belgian National Championships - XCM | CN | |
| 12.09 | |  Komlós XCO | 3 | |
| 12.09 | |  UCI MTB MARATHON SERIES - La Forestiere | SR | |
| 17.09 | |  UCI MTB World Cup XCO - SnowShoe (short circuit) | CDM | |
| 19.09 | | MTB French Cup XCO - Jeumont | 1 | |
| 19.09 | | UCI MTB World Cup XCO - SnowShoe | CDM | |
| 19.09 | | Alpentour Trophy | S1 | |
| 19.09 | | Jura Bike Marathon | 2 | |
| 19.09 | | 7R CST MTB Gdynia Maraton | 1 | |
| 19.09 | | MTB liga #3 - Randers | 2 | |
| 19.09 | | XCO Hallbyrundan | 2 | |
| 24.09 | |  Canadian National Championship - XCO | CN | |
| 24.09 | | Polish National Championships - XCC | CN | |
| 24.09 | | Rye bike festival / Rye terrengsykkelfestival | 3 | |
| 25.09 | | Slovak National Championship - XCM | CN | |
| 25.09 | | Singer Wäldercup (XCC) | 3 | |
| 25.09 | | Maja Wloszczowska MTB Race | 2 | |
| 25.09 | |  Luxembourgish National Championship - XCO | CN | |
| 25.09 | | Canadian National Championship - XCC | CN | |
| 25.09 | | Csömör Kupa | 1 | |
| 25.09 | | Rye bike festival / Rye terrengsykkelfestival - XCC | 3 | |
| 25.09 | | Sea Otter Europe Girona XCM | 1 | |
| 25.09 | | Danish National Championships - XCM | CN | |
| 25.09 | | Copa Catalana Internacional - Girona | 1 | |
| 25.09 | |  Bulgarian MTB National Championships - XCM | CN | |
| 25.09 | | PROFFIX Swiss Bike Cup Lugano XCC | 3 | |
| 26.09 | | Argentinian National Championship - XCO | CN | Geannuleerd |
| 26.09 | | Rye bike festival / Rye terrengsykkelfestival - XCO | 1 | |
| 26.09 | | Swiss National Championship - XCM | CN | |
| 26.09 | | Copa Chile Internacional - Santiago | 2 | |
| 26.09 | | Extreme sur loue - XCM | 1 | |
| 26.09 | | UCI MTB MARATHON SERIES - Bike Maraton Jelenia Góra | SR | |
| 26.09 | | 20° Gara Internazionale di Mountain Bike Gimondibike | 3 | |
| 26.09 | |  South African National Championships - XCO | CN | |
| 26.09 | |  XCO Predolac | 1 | |
Materiaalzone 
Fietstoerisme 
