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Trailer Bikes: How to Choose

mom pulling a trailer cycles or tag a long bike with her son

From Trailer Bike Type to Child Comfort, We Guide You Through the Features that Really Matter

Trailer cycles, also called trailer bikes, trail-a-bikes, tag along bikes, or trainer bikes, are a great option for kids who have moved beyond the bike trailer or child seat, but who aren’t quite ready to ride solo all the time.

With handlebars, a seat, pedals (sometimes!), and a wheel that attaches to the back of a standard adult bike, trailer cycles allow kids to get involved in the ride while remaining safely attached to an adult bike. This tandem-style ride is the perfect solution for parents that love to ride with their kids, but want to go farther than little legs can handle on their own!

StandardRecumbentTow Bar/Rope
Weeride Co-PilotWeehoo TurboTrail Gator

The 11 main criteria to help you choose the best trailer cycle for your family are: 1) trailer type, 2) child rider ability, 3) adult bike compatibility  4) the wobble factor, 5) quick release for removal, 6) quick release height adjustment 7) gears, 8) folding arm,  9) child comfort and safety, 10) rear rack compatibility  and 11) transporting additional children.

1. Trailer Bike Type

There are three basic types of trailer cycles.  1) Standard, 2) Recumbent, and 3) Tow Bar or Tow Rope. Determining which of these styles best suits you as the adult rider, and your child as the passenger is the first step in finding the perfect trailer cycle.

Reviews, rankings and comparisons of additional trailer cycles can be found using our Trailer Cycles Comparison Chart.

What Type of Trailer Cycle Do I Need?

TypeStandardRecumbentTow Bar/Rope
Burley PiccoloWeehoo TurboTow Whee
Bike StyleKid's "half-bike" attached to back of adult bikeChair with pedals attached to the back of adult bikeChild's normal bike is attached to adult bike
Mounts ToRear seat post (need about 2" clearance) or rear rackRear seat post of adult bikeSeat post of lead bike, handlebar of rear bike
Child RequirementCan sit stably on a traditional bike seatBig enough to fit safely in shoulder restraintsChild must be able to independently ride a bike
Age Range4 - 8 years old2 - 9 years old4 years old to adult
Best ForKids that want to feel like they're riding a bike but don't have the stamina to keep up with parentsYounger kids that need the extra stability or comfort of a seat with a backDeciding to tow mid-ride or for easy portability
  • Reinforces biking skills for kids
  • Has a harness to keep kids secure
  • Lower to the ground means less side to side wobbling
  • Most comfortable for child riders
  • Kids can continue to ride their own bike
  • Parents can easily decide to tow mid-ride
ConsSome models are wobblyBulkier to store than standard trailer cyclesThe bar option can be very wobbly

2. The Child Rider

Before purchasing a trailer cycle, you’ll want to make sure your child is ready to ride.

Reaching the pedals

For standard and recumbent trailer cycles, a child needs to be tall enough to reach the pedals. Most trailer bikes are about 18-20″ from the top of the saddle to the top of the pedals at its lowest position. Kids who fit a 4T pants size are usually about big enough for a trailer cycle.

Unlike a regular bike, it’s okay if your child can’t reach the ground while sitting on the seat of a trailer bike. As the adult rider, you’ll provide the balance needed when mounting, starting, stopping, and dismounting.

Stability and Confidence

Your child rider is not strapped into the trailer cycle in any way (except for the recumbent style Weehoo trailer), and they can dramatically affect the handling of the entire setup by shifting their weight (e.i. by leaning sharply to one side). For safety and enjoyability reasons, make sure your child is mature enough to sit stably on a bike seat, without making sudden movements or attempting to dismount abruptly.

If you have concerns, consider the Weehoo Turbo or the Adams Trail-a-Bike Back Rest (which is compatible with some other trailer cycles). Both provide a back rest and harness for wigglier kids. Or, stick with a bike trailer or bike seat until your child is able to safely ride a trailer cycle.

Some Kids Need Stability and Security of a Harnessed Trailer Cycle

Two girls - one riding on a Burley Piccolo trailer cycle, the other on a Weehoo Turbo.

3. Adult Bike Compatibility

Seat Post Attachment

Most trailer cycles attach to the seat post of the adult bike. This means that they’re likely compatible with most adult bikes, as long as you have about 2″ of exposed seat post between your seat tube and your seat. The WeeRide Co-Pilot and the Weehoo Turbo attache to the seat post.

If your seat post is unusually thick or thin, you should check to ensure that the hitch on your trailer cycle of choice will fit. Non-round seat posts or seat posts made out of materials other than aluminum or steel (e.g. carbon fiber) are generally incompatible.

Rear Rack Attachment

Some trailer cycles attach to a cargo rack on the rear of the adult bike, rather than to the seat post. These racks typically require bike rack eyelet mounts on the frame of your bike. Many commonly used bikes — particularly road bikes and full suspension mountain bikes — don’t have these mounts, so check carefully before buying. The Burley Kazoo and Piccolo both attach via a moose rack that comes with the trailer cycle.

Different Mounting Styles for Trailer Cycles

Trailer Cycle Mounts - seat post mount on Trail Gator and Weehoo, rack mounted on Burley Piccolo. A carbon fiber seat post, not compatible with trailer cycles.

4. The “Wobble Factor”

The most common complaint with trailer cycles is that they tend to be wobbly. This is due in part to the fact that trailer cycle child riders tend to be wobbly, but the design of the hitch (the part that connects the trailer cycle to the adult bike) can greatly increase or decrease the “wobble factor.”

Standard Seat Post Hitch

Most hitches go around the adult bike seat post and tighten via bolts. Then the hitch attaches to the arm of the trailer cycle via a separate large bolt. The large bolt allows the trailer cycle to pivot freely from side to side. A separate bolt allows for vertical movement, which is needed when going over bumps.

Trailer Cycle Hitch Attaches to Adult Bike and Trailer Cycle Arm

Trailer cycle hitch - connection around adult bike seat post stays in place. Trailer cycle rotates around two large bolts.

It’s very important to really tighten down the seat post bolts, or the entire hitch may turn around the seat post, causing the trailer cycle to hang crookedly off the back of the adult bike. It can take some practice figuring out exactly how tight you need to make those bolts, so for your first few rides, it’s not a bad idea to bring along the tools you need to re-tighten them, just in case you discover mid-ride that you didn’t get it quite right.

High-End and Rack Connections

The fewer connection points, the less wobble gets introduced and the more stable the ride. On higher-end trailers, such as Trek Mountain Train shown below, the trailer cycle arm connects directly to the hitch, which is then designed to pivot around the seat post. This effectively eliminates two of the three connection points in the standard trailer cycle hitch, resulting in a ride that’s noticeably less wobbly. Rack-mounted trailer cycles provide the most stable ride of all, thanks to their secure attachment that’s perpendicular to the ground. The Burley Kazoo and Piccolo both attach via a moose rack that comes with the trailer cycle.

High-End and Rack-Mounted Trailer Cycles are Significantly Less Wobbly

Higher-end trailer cycles have only one point of rotation on their hitch.

5. Seat Post Quick Release for Disconnecting the Trailer Cycle

If you plan to frequently switch between towing the trailer cycle and riding child-free, you’ll want to pay attention to the way that the trailer cycle removes from the adult bike. Seat-post-mounted trailer cycles generally have a quick release, which allows you to quickly install or remove the trailer cycle without any tools, while leaving the hitch attached to the seat post.

Rack mounted trailer cycles remove easily from the rack. The rack itself requires tools to uninstall, so it’s not something you’ll want to do regularly, but the rack can be used to mount panniers/saddle bags and other gear when you’re riding on your own.

Seat Post Quick Release for Easy Removal

Trailer Gator quick release allows easy removal from adult bike.

6. Seat Post Quick Release for Height Adjustments

If you have multiple trailer cycle riders of differing heights, look for a model that has a quick release on the seat post. Otherwise, you’ll need to carry an Allen wrench for any mid-trip rider switches (or swap out the stock seat post collar for a quick release version).

Seat Post Quick Release for Easy Height Adjustments

Non-quick release seat post requires an allen key to loosen. Quick release allows you to alter seat height without tools.

7. Gears

While most trailer cycles are single speed, some, like the Burley Piccolo do have gears, typically 6 or 7 on a rear derailleur. While we generally prefer non-geared trailer cycles for their simplicity and lower price, gears do give kids a great opportunity to experiment with shifting gears while still under the control of an adult bike. 

Most geared trailer cycles have grip shifters while others have thumb shifters. Thumb shifters are generally considered to be easier for small hands to operate, but shifters do vary widely in stiffness and ease of operation. If at all possible, have your kids test ride a geared trailer cycle before purchasing to ensure they’re physically able to operate the shifter.

Gears don’t make much of a difference in the ease of pedaling for the adult rider. Trailer cycles with gears are also more expensive than their single-speed equivalents, and require more maintenance due to the rear derailleur. It’s up to you to decide whether the extra price is worth the extra money and hassle.

Geared Trailer Cycles Allow Kids to Shift

Trailer Cycle Gears on Burley Piccolo.

8. Folding Arm

Many trailer cycles have some sort of quick release connection midway down the arm that allows you to fold the arm under the trailer cycle. This is handy to reduce storage space or for transporting in a car. The WeeRide Co-Pilot features a folding arm.

A Folding Arm Makes for Compact Storage

Trailer Cycle folding arms allow for compact storage.

9. Child Comfort and Safety

Adjustable handlebars, while not essential, can help dial the fit for riders of different heights. Some trailer cycles include a splash or mud guard on the trailer cycle arm. The WeeRide Co-Pilot and the Burley Kazoo and Piccolo feature adjustable handlebars and a mud guard.

Riding in rainy Seattle, my kids and I haven’t noticed a significant difference in the amount of splash with vs. without a splash guard, so it probably shouldn’t be a deciding factor in your final choice of trailer cycle. If your kids are getting sprayed when riding in wet conditions, you can also consider a fender on the adult bike’s back wheel.

A flag is really important to increase visibility/awareness of your trailer cycle rider. If your trailer cycle didn’t come with one (WeeRide Co-PilotBurley Kazoo and Piccolo come with safety flags), you can easily buy a generic one on Amazon. There are many options, although this safety flag is my favorite, as the reflective strips on the flag make it more visible in low-light conditions.

Adjustable Handlebars, Mud Guards, and Safety Flags Add to Rider Comfort

Some trailer cycles have handlebars that can adjust to the height of the rider.
Some trailer cycles come with splash guards and safety flags.

10. Rear Rack Compatibility

If you already have a rear cargo rack on your bike (or want to install one), you’ll need to ensure it’s compatible with the trailer cycle you choose. I tested a number of different combinations of trailer cycles, adult bikes, and racks, and was generally able to get them all to work together. One rack, an Axiom, is height-adjustable and I had to adjust the rack nearly all the way down to make it low enough for a trailer cycle to fit over it.

The one rack that gave me consistent problems was a seatpost-mounted rack. (I have a Delta Post Porter). If I mounted it below the trailer cycle, the trailer cycle arm rubbed on it. If I mounted it above, it hit the “bump” in the trailer cycle arm. I also had concerns that the weight of the cargo + kid might be too much for the seat post. You will need panniers or other bags that hang off the sides of your rack instead. “Rack trunks” that install on top of the rack will interfere with the pivoting of the trailer cycle arm.

Rear rack could interfere with a trailer cycle that attaches to the seat post.

11. Transporting other children

If you have a younger child who you want to transport along with your trailer cycle rider, the best option is a front-mounted child seat, as this doesn’t interfere with the trailer cycle in any way. Trailer cycles are generally incompatible with rear-mounted child seats, as the child seat interferes with the trailer cycle arm.

1. Mom riding with child on a trailer cycle in the rear and smaller child in child bike seat in the front. 2. Mom riding with older child on trailer cycle in rear, connected to a smaller sibling in a bike trailer behind.

You may be able to hook up a bicycle trailer to the back of the trailer cycle. The resulting “road train” is quite long and more difficult to maneuver, so you’ll need to ride very cautiously and stick to bike trails and other spots with less traffic and less required maneuvering. Be sure to double check your trailer cycle’s manual first, as some explicitly state that they should not be used with bike trailers.

If you want to transport two older children on a trailer cycle, consider a two-seater trailer cycle, such as the Weehoo Turbo.

What trailer is best for you?

Now that you know what to look for, check our Trailer Cycles Comparison Chart for help finding the best trailer cycle for you and your child.

Or for a quick list of our favorite picks, see our 7 Best Trailer Cycles list.

Other Resources

International Bike Fund – Child Bike Seats vs. Trailers for Infants: For an interesting discussion on the safety merits of child bike seats vs. trailers and trailer cycles by a non-profit international biking group.

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