Coloured bib numbers are required to distinguish competitors in each age group, and not to indicate the start group; different bib colours must thus be applied for different age groups, even if they are starting together, as per the TREK UCI Gravel World Series visual guidelines.
Race numbers will be provided by the organization. Numbers must not be folded or modified and must clearly display the advertiser’s logo. It is the rider’s responsibility to ensure that their race numbers are readable. Riders whose numbers are unreadable at the finish may not get a placing and may forfeit their prizes.
The bib numbers are to be placed on the back of the jersey and on the left side (please see image below)