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From 2008 ABA Rulebook... Section X. Rider Identification

 

X. Rider Identification

 

4. A rider’s current earned or ABA issued number must appear on that rider’s

    number plate during all competitions*.

    This identification can appear in the following forms only:

    a. District number—solid black number on a white background.

    b. National age group number—solid black number on a light gray background.

    c. Overall national number—solid white number on a black background.

    d. Redline Cup Championship number—solid black #1 on a yellow background.

    e. Race of Champions number—solid white #1 on a red background.

    *Any rider not using his/her earned number may not be scored for that race.

 

5. All number plates shall have legible numbers at least 3” in height. The

    number shall be unobstructed by other decals so as to be read clearly.

 

6. All numbers must be placed on the number plate so that they do not overlap.

 

7. The number plate must be attached securely to the front of the bicycle’s handlebars.

 

8. In classes where riders have the same number, a letter may be required

    to be displayed on the number plate for identification purposes. This

    letter will be supplied in staging and must remain on that rider’s number

    plate for the duration of the day’s race or until told otherwise. Riders to

    receive a letter will be determined at the track’s discretion.

 

9. ABA has the right to reject any number plate that it deems illegible and

    these decisions are final. A number cannot exceed three digits.

 

From 2008 NBL Rulebook... Chapter 15: Equipment

 

E. All bicycles must be in good condition. Each must be equipped with:

 

1. A number plate with legible numbers. Stickers may be placed on the number plate 

    along the sides and must not interfere with the number. All numbers must

    be at least 3".  Elite Men and Women must have a white plate with black numbers.

 

    At National events, numbers permitted on plates include:

 

    a. All World numbers, ex. W1

 

    b. All National numbers, ex.  7  (for Expert, Girls, Cruisers and Elite classes)

 

    c. Regional numbers, ex. (number plus the first letter of the rider’s last name)

 

    d. All novice National numbers must use N, ex. N2 (Novice 2)

 

    e. All rookie National numbers must use R, ex. R3 (Rookie 3)

 

    f. If none of the above numbers were earned, then a rider must use the

        last three digits of his NBL license number.

 

    g. No state numbers are permitted at National events.

 

    h. At all local races, numbers permitted on plates are:

        1. All of the above,

        2. All earned state numbers