The minimum race-age for entry is 18, however please see the Categories and Rider Age section of the rules.   In some countries, riders aged under 18 may be allowed to enter the U23 Age Group Categories at the sole discretion of the event host.

The rider’s race-age is calculated as on 31 December of the year of the event. The categories available, for both Male and Female riders, are:


Single Speed

Riders with a Disability

Under 23









Riders who enter Age-Group will automatically be placed in the appropriate category by WEMBO, based on their age as at 31 December of the year of the race.   The 60+ age category may be further sub-divided into 60-64, 65-69 and 70+ at the discretion of the Race Organiser and subject to entry numbers in the categories.

The Riders with a Disability Category

First introduced at the 2019 WEMBO World Championships in Brasil, this category offer riders with a disability the opportunity to race in their own category.   The type(s) of bicycles used is solely at the discretion of WEMBO and the Event Host and will be determined by the nature of the course.   The inclusion of the category is solely at the discretion of the event host for each WEMBO event.   This new category was very well received by the riders in 2019.   As an example, recumbent bicycles could not be used in Brasil due to there being two very narrow wire suspension bridges on the course.   This may also mean that there will be diversions on the course for riders in this category.   It is also possible that the nature of the course might make the inclusion of this category impossible.

What Category Should I Enter ?

For their gender, a rider can enter Elite, Single-Speed, Disability or Age-Group but a rider can only enter one category in the event.   The World Champion title will only be awarded to the winners of the Elite Category (Male and Female), even if a rider from another age category comes in ahead of them.   This is because the Elite categories may have their own separate start time, or, in very large events, their own separate course.   The Elite categories are open to all riders aged 18 or greater.   If you want to be the world champion and have your name on the perpetual WEMBO trophy - enter Elite.

Wembo does not have any requirements about entering Elite versus Age-Group.   That is the rider's decision and they need to make that decision based on their appreciation of their own abilities and their own aims for the race.   WEMBO appreciates that as more new riders and new countries join the WEMBO family, it may be difficult for new riders to initially determine whether they should enter Age-Group or Elite and that over several years a rider might decide to move from Elite to Age-Group or the other way around.   Because of this, there is no restriction on a rider moving betwen Elite and other categories from one WEMBO event to another, nor for entering Elite at a Continental Championships and Age-Group at a World Championships.   However, see the next paragraph about how close to the start time a category can be changed.

Gender-Based Categories

WEMBO wishes to provide inclusive opportunities for all riders to race in Solo 24 Hour Mountain Biking.   WEMBO follows the UCI regulations when assigning a rider to a category in a WEMBO event and applies the UCI definition of an International Event to a WEMBO event.   These regulations came into effect in July 2023 and can be found in Part XIII of the UCI Regulations (Medical Rules), Section 13.5.   Article 13.5.015 provides specific criteria that Transgender (Male to Female) Athletes must meet to be allowed to race in a Female category at a WEMBO event.   A Transgender athlete who enters a WEMBO event automatically agrees to meeting all of the requirements in the UCI regulations for compliance, testing and information sharing.

Changing Category

A final start list will be published at the close of Registration on the day before the race start, and will be available at the Race Brief.   This may be published either electronically, available online or as a printout.   If the Race Brief is conducted on the day before race start, then riders have 30 minutes after conclusion of the Race Brief to advise the Race Director of any category changes.   After that time, no rider-initiated changes to the starting list, by rider or category, are permitted.   If the Race Brief is conducted on the day of the race start, then the closing time for category changes is 1800 on the day before race start.   A Rider cannot change their category on the day of the race or during the race.

If a rider has entered themselves incorrectly; for example, if a male rider has entered a female category; or a rider using a geared bike has entered Single-Speed; then WEMBO may change the riders category at any time at its sole discretion and/or apply a penalty if deemed appropriate.

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