Attaching a bike trailer requires mounting a compatible hitch to your rear axle or frame, connecting the trailer’s tow arm with a locking pin, and securing the safety strap as a failsafe.
One wrong connection and a trailer full of cargo or a child could detach mid-ride. The fix comes down to knowing your axle type and following a short, specific sequence. Most people overthink this — it takes about ten minutes once you have the right parts in hand. Below is the exact process for quick-release, bolt-on, and thru-axle bikes, plus the safety step nobody should skip.
What Hitch Do You Need Based On Your Bike’s Axle?
The hitch you install depends entirely on your bike’s rear axle type and frame dropout shape. Check your bike before buying anything — a mismatch here means the hitch won’t sit flush.
| Axle & Dropout Type | Hitch or Adapter Required |
|---|---|
| Quick-Release + Standard dropout | Standard hitch (e.g., Burley Steel Hitch) — no adapter needed |
| Quick-Release + Hooded dropout | Standard hitch plus Quick Release Adapter |
| Bolt-on + Standard dropout | Standard hitch — no adapter needed |
| Bolt-on + Hooded dropout | Standard hitch plus specific axle adapter |
| Thru-axle | Thru-Axle Adapter — measure axle length and thread pitch from your bike manual |
Burley’s hitch guide documents these combinations clearly. InStep and Wike trailers typically include the hitch with the trailer, so the main question is whether your bike’s axle accepts it.
How To Install The Hitch On Your Bike
Follow the method that matches your axle type. The process changes significantly between quick-release, bolt-on, and thru-axle systems.
For Quick-Release Axles: Open the QR lever and unscrew the nut from the left side. Remove the skewer and spring, leaving the wheel in place. Place the tab washer into the dropout slot, then slide the coupler plate onto the axle with it horizontal. Reinsert the skewer, springs, and nut — keep the coupler loose initially so you can adjust the angle. Tighten the QR lever until you feel firm resistance, then rotate it up until an indent mark shows.
For Bolt-On Axles: Remove the nut from the right side of the axle with a wrench. Insert the hitch onto that side, thread the skewer through the coupler, and reattach the bolt. Tighten it just enough to prevent swinging while allowing minor angle adjustments. Once the hitch sits flush against the dropout, fully tighten the axle nut.
For Thru-Axles: Compare the new thru-axle to the original — thread pitch must match and length should be within ±2mm. Apply grease to the threads, insert the axle through the frame and wheel, and hand-tighten. Use a 5mm hex torque wrench to snug it to 12 Nm. Slide the hitch onto the threaded stud (typically the disc brake side), then secure it with a 5mm hex and 17mm wrench, tightening to 12 Nm.
For Frame-Clamped Hitches: Ensure the clamp is loose, drop the hitch into position on the frame, then tighten the clamp. This method is most common with Burley’s Classic Hitch.
Connecting The Trailer To The Hitch
With the hitch installed, attaching the trailer itself is a straightforward two-minute job. Unfold the tow arm from under the trailer and extend it until the locking pin holes align — insert the retaining pin and secure the clasp. With the trailer unloaded, insert the tow arm end into the bike hitch. Align the holes, push the retaining pin through, and close the clasp underneath.
For Burley hitches, insert the Flex Connector between the two hitch holes, then push the Lock Pin through and close the retainer. For Wike trailers, insert the red trailer hitch into the bike hitch and attach the Tablock pin. If you are shopping for a child’s trailer, read our childs bike trailer recommendations for models that include compatible hitch systems.
Check that the tow arm does not contact the rear spokes — if it sits too close, wrapping the safety strap multiple times can pull the tongue away from the wheel.
Why The Safety Strap Is Non-Negotiable
The locking pin is your primary connection, but the nylon safety strap is what prevents a full detachment if that pin fails. Wrap the strap around the bike frame — typically the chain stay or cross post — and clip it to the D-ring on the tow arm. For child trailers like Burley models, wrap the strap twice around the frame before latching the D-ring to the tow bar. This tether keeps the trailer attached even if the pin works loose, giving you time to stop safely.
Common mistakes include over-tightening the hitch so it cannot angle properly, using a hitch on a hooded dropout without an adapter, and skipping the safety strap entirely. Any of these can make the ride unsafe, but all are easy to avoid once you know they matter.
FAQs
FAQs
Can I attach a bike trailer to a bike with disc brakes?
Yes, but you may need a specific thru-axle adapter for the disc brake side. Most trailers, including Wike H1 models, mount the hitch on the disc brake side of the axle. Check the manufacturer’s compatibility chart before purchasing.
How tight should the axle nut be on a bolt-on hitch?
Tighten the axle nut enough to prevent the hitch from swinging freely, but leave slight looseness for angle adjustments. Once the coupler sits flush to the dropout, fully tighten the nut with a wrench until the hitch has no play.
Do I need a separate hitch for an InStep trailer?
InStep trailers include the hitch as part of the package. The standard hitch mounts to the rear axle and works on most quick-release and bolt-on bikes. You should not need to buy a separate coupler unless your bike uses a thru-axle.
References & Sources
- Burley. “Burley Hitch Guide.” Documents standard and frame-clamped hitch installation steps.
Mo Maruf
I created WellFizz to bridge the gap between vague wellness advice and actionable solutions. My mission is simple: to decode the research and give you practical tools you can actually use.
Beyond the data, I am a passionate traveler. I believe that stepping away from the screen to explore new environments is essential for mental clarity and physical vitality.