Time Trial / Time Trialling / TT

https://www.cyclingtimetrials.org.uk/articles/view/11

1. Competitor's Clothing
   Competitors must be clothed from the neck to at least mid-thigh. Sleeves shall be at least mid upper arm length. Not withstanding the above, when competing in Type B Events, triathlon style sleeveless tops are permitted. Swimming type suits and running vests are not allowed.
   To be allowed to start all clothing shall be clean and tidy.
   No competitor may carry advertising or the name of a commercial business on his race clothing except:
   
   

(a) where he is a member of a club or team that has paid the advertising fee, he may carry advertising, but must not compete in clothing of a trade team that is/has been registered with the UCI unless he is a member of that team: or

(b) when competing in club events
N.B. The inclusion of a manufacturer's logo shall be permitted.

Competitors on solo machines must prominently display a number on a fluorescent or reflective background of not less than 20x20cm. The number shall be centrally positioned below the waist so as to be clearly visible from the rear when in his normal riding position. Position number as shown below

N.B. If the rider's top covers his shorts, the number should be placed in a position equivalent to that described.
In tandem events each tandem shall be allocated one number which shall be worn by the rear rider as described above. The use of additional numbers shall be at the discretion of the promoter. Competitors must give their number verbally when called upon to do so by an official of the promoting organisation.