Yes, you can carry a child on an e-bike in South Australia, as long as the bike is designed or fitted to carry them. In practice that means the child sits in a proper child seat, rides in a bicycle trailer, or sits in a passenger seat on a cargo bike built for passengers. They must wear an approved bicycle helmet, and if you're towing a child in a trailer you must be at least 16 and the child must be under 10.
The short version: one passenger per passenger seat, a helmet on every head, and no passengers the bike isn't built or equipped for. Trailers: rider 16 or older, passenger under 10, one trailer at a time, with reflectors, a safety chain and lights at night. Sources: the Department for Infrastructure and Transport's Cycling and the Law guide and the Legal Services Commission's Law Handbook.
Do the same rules apply to e-bikes and regular bikes?
Yes. In South Australia a legal, compliant e-bike (a power-assisted bicycle) is treated as a bicycle, so the passenger, helmet and trailer rules below apply exactly as they would to a pedal bike. The catch is that the e-bike itself must be legal: an over-powered or de-restricted e-bike can't be ridden on SA roads or paths at all. See our guides to e-bike rules in South Australia and e-bike power and speed limits.
The passenger rule: only as many people as the bike is built for
Rule 246 of the Australian Road Rules says you must not carry more people on a bicycle than it is designed to carry. The Legal Services Commission's Law Handbook gives a handy example: a bicycle with a child's seat attached is designed to carry two people, provided one of them is a child in the child seat. It also says that carrying someone on a bike that isn't designed for passengers, such as on the handlebars, is against the law.
The Department for Infrastructure and Transport (DIT) guide agrees: extra people must not be carried unless they are in a seat designed for a passenger or in a bicycle trailer. So for an e-bike, your legal options are:
- A child bike seat fitted to the rear rack or frame (or a front seat), one child per seat.
- A bicycle trailer towed behind the bike, within the trailer rules below.
- A cargo or longtail e-bike fitted with the manufacturer's passenger seats, footrests and rails, carrying no more children than it's equipped for.
Helmets for child passengers
Under rule 256 of the Australian Road Rules, bike riders must wear an approved bicycle helmet. DIT's Cycling and the Law guide says the helmet must be properly adjusted and securely fastened, and that this also applies to any passenger on your bicycle or in a trailer. It names the Australian Standard AS/NZS 2063 for bicycle helmets.
The same guide says children carried in bicycle carrier seats must wear approved helmets and be safely restrained, so do up the seat's harness every ride. For help choosing your own lid, see our guide to the best e-bike helmets in Australia.
Child bike seats on an e-bike
The road rules don't say which seat to buy, but DIT's guide does make one practical point: the carrier seat or trailer must keep the child far enough from the wheels that they can't put fingers, toes or toys into a moving wheel. Good seats have deep footwells or foot straps for exactly this reason.
E-bikes add a few extra things to check before you buy:
- Where the battery lives. Many e-bikes carry the battery in the down tube, but some older or budget models mount it on the rear rack. A rack-mounted seat may not fit, or may block battery removal, on those bikes.
- The rack's load rating. A child plus seat is a lot of weight. Check the maximum load stamped on the rack (or in your e-bike's manual) is higher than the seat maker's requirement, and that the e-bike maker allows child seats on it at all.
- Kickstand and frame. A sturdy double-leg kickstand and a step-through frame make loading a child, and getting on yourself, much easier.
Thule Yepp 2 Maxi
A rear child seat from Swedish brand Thule that mounts on a rear rack (there's also a frame-mount version). It suits children from about 9 months to 6 years and up to 22 kg, with a 5-point harness and adjustable footrests. Australian retailers note it suits most e-bikes with an approved rear rack, so check your rack first and buy the right version.
- Up to 22 kg, roughly 9 months to 6 years
- 5-point harness and child-proof buckle
- Wipe-clean, water-repellent seat
- Needs a suitable rack (or the frame-mount version)
- Premium price
Hamax Siesta
A rear child seat from Norwegian brand Hamax, sold in rack-mount and frame-mount versions. Its party trick is a reclining backrest (up to about 20 degrees), which helps when a small passenger nods off on the way home. It's rated up to 22 kg, and the rack version is listed as suitable for e-bikes when the rack is approved for the load.
- Reclining seat for sleepy kids
- Rack and frame-mount versions
- Rated up to 22 kg
- Rack version needs a sturdy, rated rack
- Check you're buying the right mount for your e-bike
Towing a child in a bike trailer: the SA rules
Trailers suit e-bikes well because the motor takes the sting out of the extra weight. DIT's Cycling and the Law guide sets out the rules for towing one in South Australia:
- Rider age: you must not tow a trailer carrying a person unless you are 16 or older.
- Passenger age: you must not tow a trailer with a passenger aged 10 or older.
- Helmets: the trailer passenger must wear an approved helmet.
- One at a time: you must not tow more than one bicycle trailer.
- Width: equipment or load on the trailer must not be more than 85 cm wide.
- Coupling and safety chain: the coupling must be robust and allow enough left-to-right movement, and a safety connection such as a chain must hold the trailer if the coupling fails.
- Reflectors and lights: two rear reflectors, evenly spaced either side of centre, between 33 cm and 1 metre above the ground. Between sunset and sunrise, or in hazardous weather, one or two red tail lights must be fitted to the rear within the same height range.
The trailer passenger rule is rule 257 of the Australian Road Rules ("Riding with a person on a bicycle trailer"), which SA's Road Traffic (Road Rules – Ancillary and Miscellaneous Provisions) Regulations refer to directly.
On an e-bike, check the hitch fits your rear axle. Many e-bikes use thru-axles or hub motors with nutted axles, and trailer makers sell adapters for these. Your e-bike's manual may also set a maximum total weight.
Burley Bee
A lightweight child trailer from US brand Burley, available in single and double versions. Burley says children need to be at least 12 months old and able to hold their head up while wearing a helmet, with a limit of 18 kg per child. It has 5-point harnesses, reflectors and cargo space, and folds flat. Burley's hitch suits many e-bikes, though some need an adapter, so check Burley's hitch guide for your axle.
- Carries one or two children plus cargo
- Light aluminium frame, folds flat
- Comes with reflectors and 5-point harnesses
- Add your own red tail light for riding after dark
- Some e-bikes need a hitch adapter
Seat, trailer or cargo e-bike: which suits you?
A child seat is the cheapest option if your e-bike already has a suitable rack or frame, but the weight sits high, so the bike feels top-heavy when stopped. A trailer keeps the weight low, takes two children plus bags and keeps the weather off, but it's wider and needs somewhere to live at home. A cargo or longtail e-bike is the most capable choice for regular school runs, as long as it's fitted with the maker's passenger kit and you carry no more children than it's equipped for.
Practical tips for riding with kids in Adelaide
- Practise first. Ride a quiet street with a bag of shopping in the seat or trailer, using a low assist level, to get used to the handling and braking.
- Pick quieter routes. Shared paths like the River Torrens Linear Park and Coast Park are good places to build confidence. See our guide to the best bike paths in Adelaide.
- Be seen. A rear light on the bike and one on the trailer help drivers spot you, and are required at night. Our e-bike lights guide covers good options.
FAQ
Can my child sit on the rear rack of my e-bike if they hold on?
No. Under rule 246 of the Australian Road Rules you can't carry more people than the bike is designed or equipped for, and DIT says extra people must be in a seat designed for a passenger or in a bicycle trailer. A plain rack isn't a passenger seat.
How old does my child need to be for a bike seat?
SA's road rules don't set a minimum age for child seats, but the child must wear an approved helmet and be safely restrained. Seat makers set their own limits, usually from around 9 months (when a child can sit up unaided and wear a helmet) to about 22 kg. Follow the instructions for your seat.
Can a 15-year-old tow their younger sibling in a bike trailer in SA?
No. According to DIT's Cycling and the Law guide, you must be 16 or older to tow a bicycle trailer carrying a person, and the passenger must be under 10.
Can I carry two children on one e-bike?
Only if the bike is designed or equipped for two passengers, for example a cargo or longtail e-bike with a two-child passenger kit, or a bike with a front and rear child seat if the manufacturers allow that combination. A double trailer can also carry two children under 10.
This article is a general summary based on official South Australian sources current at the time of writing, not legal advice. Rules can change, so check the Department for Infrastructure and Transport and the Law Handbook links above before you ride. Products are researched picks, not hands-on tested.