UCI CYCLING REGULATIONS  or be less than 4 cm and their capacity must be a minimum of 400 ml and a maximum of  800 ml.  (article introduced on 01.10.11; text modified on 01.01.13)  1.3.024  Any bicycle may be fitted with onboard technology equipment (including but not limited  ter to telemetry, transponder units, GPS units and video-cameras) that has the ability and  purpose to collect or transmit data, information or images provided that it complies with  the following conditions:  1. The system to install the equipment must be designed for use on bicycles and  shall not affect the certification of any item of the bicycle;  2.  The system to install the equipment must not allow the equipment to be  removed during the race and the equipment will be considered non- removable;  3.  Any and all data stemming from a rider’s onboard technology equipment must  not be transmitted during a race to a third person.  Any intended use by a team or rider of onboard technology equipment shall require prior  authorisation by the UCI or the organiser, with UCI’s consent. Requests for authorisation  shall be assessed, inter alia, on criteria of equal access to equipment, sporting fairness  and integrity, and shall also comply with article 1.3.006.  The UCI shall not be liable for any consequences deriving from the installation and use  of onboard technology equipment by licence holders, nor for any defects it may hold or  its non-compliance.  For the sake of clarity, point 2 above does not apply to removable computers / rider  information systems.  (article introduced on 01.01.16; text modified on 15.02.19)  1.3.024  The UCI may fit, or appoint its agents or commissaires to fit, onboard technology quarter  devices for the purpose of detecting technological fraud during competition. Refusal by  a team or rider to comply with instructions to carry such onboard technology devices  may lead to the imposition of disciplinary measures in accordance with article  1.3.003bis. (article introduced on 15.02.19)  1.3.025 Freewheels, multiple gears and brakes are not permitted for use on the track during  competition or training. Disc brakes are allowed in cyclo-cross training and competition. Disc brakes are allowed in mountain bike training and competition. Disc brakes are allowed in road race and time trial training and competition.  Disc brakes are allowed in BMX training and competition.  Disc brakes are allowed in Trials training and competition. For races on the road and cyclo-cross, the use of fixed sprocket is forbidden: a braking  system that acts on both wheels is required. (text modified on 01.09.04; 01.01.05; 01.01.09, 01.07.09; 01.07.10; 27.03.17; 01.07.18)  E0221  GENERAL ORGANISATION OF CYCLING AS A SPORT  71 