What bike and helmet rules apply to juniors?

Helmet (all ages): compulsory and approved by a testing authority recognised by a national federation affiliated with World Triathlon. No alterations or additions, including to the chin strap, and no omitted parts. It must be securely fastened from the moment the bike is taken off the rack until it is racked again after the bike leg; the buckle cannot be locked or unlocked in that time.

Extra equipment rules for competitors aged up to and including 13 in age-group categories:

• The bike may be on-road, off-road or youth style. No time trial style or recumbent bikes.
• Only standard drop, straight or curved handlebars. No clip-on or time trial bars.
• Wheels must have at least 16 spokes, with no composite-fibre rims.
• No disc wheels or wheel covers.
• Only detachable (clincher) tyres and tubes; "singles" are not allowed.
• No time trial style helmets.

All ages: an operational brake on each wheel, handlebar ends plugged, no fixed-gear bikes, and a bike no more than 1.85 m long.

Source: AusTriathlon Race Competition Rules, June 2026, rules 3.3 to 3.5, 3.12 and 3.13.