All ages are calculated from competitors age on 1st January each year.

Competitors remain in an age class for the whole calendar year (January 1st – December 31st) regardless of individual date of birth.

Leagues with events that cross the calendar year (January 1st – December 31st) carry the age classes over until the league has finished.

MBO Score events ALLOW teams of two riders to compete.

MBO events usually do NOT allow teams of two.

Solos / Teams of two (Combined Age Range)

Y18 = Youth (aged 15,16 or 17)
M21 = Open Men (17 to 39) / (34 to 79) Open Class, any age can compete
W21 = Open Women (17 to 39) / (34 to 79) Open Class, any age can compete
M40 = 40 to 49 / (80 to 99)
W40 = 40 to 49 / (80 to 99)
M50 = 50 to 60 / (100 to 120)
W50 = 50 to 60 / (100 to 120)
M60 = 60+ / (120+)
W60 = 60+ / (120+)

Teams of two only

X21 = Mixed (combined age 34 to 79)
X40 = Mixed (combined age 80 to 99)
X50 = Mixed (combined age 100+)
X60 = Mixed (combined age 120+)
G = Generation (youth 12-17 & Adult 18+)
T21 = Tandem (any age combination)

Note: Event classes maybe combined depending on numbers