UCI CYCLING REGULATIONS  16.17.005  There should be no adjustment made possible to the equipment during the race. All  adjustments must be made prior to the start of the race.  16.17.006 [article abrogated on 01.02.09]  16.17.007  Wheels of the handcycle may vary in diameter between a minimum (ETRTO) 406 mm  and a maximum of 622 mm. Modified hub attachments may be used if necessary. The  width of handcycle double wheels may vary between 55 cm minimum and 70 cm  maximum, measured at the centre of each tire where the tires touch the ground.  16.17.008 Disk wheels are accepted for handcycle in the mass start competitions.  16.17.009  A handcycle shall not measure more than 250 cm in length. Its maximum width shall be  75 cm overall.  16.17.010  The shifting device should be within the extremities of the handlebars, except for H1,  who can fit their shifting device on the side of their body to allow for their arm to shift  gears.  16.17.011  The largest chain ring shall have a guard securely fitted to protect the rider. The  protection shall be made of adequate solid material and fully cover the chain ring over  half of its circumference (180°) facing the rider.  16.17.012 Any fillets, or ribs, inserted at joins between tubes, shall be for strengthening purposes  only. Non-functional, aerodynamic devices are not permitted for competition.  (article introduced on 01.01.04; text modified on 01.02.17)  (text modified on 01.01.04; 01.01.10; 01.01.16)  Protections which don’t fully cover the chain, such as mountain bike chain guide, are not  allowed.  (text modified on 01.02.09; 01.01.10; 01.01.20)  A braking device shall be fixed on the handgrips, except for H1, who can fit their shifting  device on the side of their body to allow for their arm to brake. (text modified on 01.01.04; 01.02.09; 01.01.16)  (article introduced on 01.02.09)  (text modified on 01.01.04; 01.02.09)  (article introduced on 01.02.09)  E0121  PARA-CYCLING  74 