How to Connect a Burley Trailer to an Aventon Level 2 E-Bike
The Aventon Level 2 is a Class 2 commuter e-bike, and the Burley is one of the most widely used cargo and child trailer brands on the market. Connecting the two is mechanically straightforward — but there are a few compatibility details, attachment methods, and load considerations worth understanding before you hook anything up.
What Makes This Pairing Work (and What to Watch)
Burley trailers use a universal hitch system designed to attach to the rear axle of a standard bicycle. The Aventon Level 2 has a rear hub motor with a 12mm solid quick-release axle — not a standard 9mm QR axle found on many non-motorized bikes. This difference matters when selecting or fitting the hitch coupler.
Most Burley trailers ship with a steel hitch arm and a coupler loop that slides onto the axle. For the Level 2's thicker rear axle, you may need a hitch adapter or the correct-size coupler insert that fits the 12mm axle diameter. Burley offers multiple hitch options, and some newer trailers include adapters for different axle sizes in the box. Check what came with your specific trailer model before assuming the default hardware fits.
The Basic Connection Process
🔧 Here's how the attachment generally works across Burley trailers:
- Remove the rear axle nut or quick-release skewer on the left or right dropout side of the Level 2's rear wheel (Burley typically attaches to the non-drive side, but check your trailer's manual).
- Slide the hitch coupler onto the axle, positioning it between the dropout and the wheel nut.
- Reinstall the axle nut and tighten it securely. The coupler should sit flat against the dropout and not spin freely.
- Attach the trailer arm to the coupler. On most Burley models, the arm clips or pins into the coupler with a retaining mechanism that allows the trailer to pivot and articulate during turns.
- Connect the safety strap (if included with your trailer model) around the chainstay or seatstay as a secondary retention point in case the hitch coupler fails.
Always test the connection by hand before riding — lift the trailer tongue, push side to side, and confirm it's seated before putting any load in.
Variables That Affect the Setup
Not all Burley trailers or Level 2 configurations are identical. A few things that shape how this connection works in practice:
| Variable | Why It Matters |
|---|---|
| Trailer model | Burley Bee, D'Lite, Cub, and Solo use similar but not identical hitch hardware |
| Axle width and thread | The Level 2's rear axle spec affects which coupler insert you need |
| Hitch generation | Older Burley hitches may require a separate adapter for 12mm axles |
| Non-drive vs. drive side | Attachment side can vary by trailer; some allow either side |
| Load weight | Affects handling, braking distance, and motor strain on the Level 2 |
Weight, Load Limits, and E-Bike Considerations
The Aventon Level 2 has a stated maximum rider weight capacity and a rear rack load limit (around 55 lbs for the rack on most configurations, though verify this in your owner's manual). When towing a trailer, the load is borne through the axle, not the rack — but the total system weight still affects how the bike handles, brakes, and climbs.
Burley's cargo trailers have their own maximum payload ratings, typically in the 100 lb range depending on the model. Running a loaded trailer on a Class 2 e-bike doesn't violate those limits on its own, but the combination of trailer weight, cargo weight, and rider weight creates a combined load that places real demands on the drivetrain, brakes, and frame.
Hydraulic disc brakes will generally outperform mechanical disc or rim brakes when towing, especially on downhills. The Level 2 uses disc brakes, which is a practical advantage in a towing setup.
How the Motor Affects the Experience
The Level 2's 750W rear hub motor provides pedal assist and throttle up to 20 mph (Class 2 limit). Towing a trailer doesn't bypass the motor's output ceiling — it just means the motor works harder at lower speeds, especially on grades. 🚲
Battery range will decrease when towing, particularly with heavier loads or headwind. How much depends on terrain, combined weight, assist level used, and temperature. There's no fixed formula — expect it to vary and plan routes accordingly.
What Your Specific Setup Requires
The exact hitch coupler size, adapter requirements, and attachment steps depend on which Burley trailer model you have, the production year, and which hitch kit came with it. Burley's website offers hitch compatibility guides, and their customer support can confirm which adapter fits a 12mm rear axle if the included hardware doesn't seat correctly.
The Aventon Level 2's rear axle specs are documented in the owner's manual and on Aventon's support site. Cross-referencing both sets of specs — trailer hitch diameter and bike axle diameter — is the step most people skip, and it's the one that causes problems at installation.
Once those measurements align and the coupler seats properly, the mechanical connection itself is simple. The more nuanced questions — how much to load, which routes to avoid, how to adjust braking for the added weight — depend on your terrain, cargo, and riding habits in ways no general guide can fully account for.