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For 2022:
YOUTH CLASSES
See ACU Handbook Trials Standing Regulations (Page
6 )
TSR.1
for full details
* Note
change to B/C class again for 2022:
riders who reach the age of 12 in 2022 (ie born after
31.12.2009) have the option of either:
• Moving to the B class in the year in which they reach 12 yrs
on a machine up to 125cc (and being eligible for B Class points)
a rider MUST be 12 to ride a 125 mono.
OR
• Remaining in the C Class for another year on a
machine of up to 80cc and retaining
eligibility for C Class points.
Youth Age
Groups:
A Class
born between 01.01.05 and 31.12.06
B Class born between 01.01.07 and 31.12.10*
C Class born between 01.01.10* and 31.12.12
D Class born between 01.01.13 and 31.12.16
E Class: minimum age 4 years at the date of competition. Minimum
age for combustion
engine machine is 6
years.
ENGINE CAPACITY CLASSES:
The maximum engine
capacity and wheel size permitted for machines used in the age
groups set out in this Regulation are as follows:
A&B Class 125cc Mono or
250cc Twinshock**, and Electric up to 10 bhp measured at the rear
wheel
**Twinshock machines
over125cc must have twin rear suspension and drum brakes at time
it was manufactured
C Class Standard
& Medium Wheel 80cc, and Electric up to 7 bhp measured at the rear wheel
D Class Medium &
Small wheel
80cc, and Electric up to 7 bhp measured at the rear wheel
E Class Small wheel
Electric powered machines up to 2 bhp measured at the rear wheel
Wheel sizes
riders
must enter the class which covers the wheel size of the machine
they take part on
Standard Wheel – 21"
Front – 18" Rear
Medium Wheel – 19" Front – 17" Rear
Small Wheel – 16" Front – 14" Rear
The above is based on
the wheels of combustion engined machines using motorcycle
tyres. If other wheels are used as on current Electric powered
machines then the outside diameter (total circumference) of the
tyre must not exceed that of the corresponding tyre size.
Engine Sizes
Rebores are permitted
subject to the resulting engine capacity not exceeding a
tolerance of +3cc
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