Operating Instructions for the Extrawheel Bicycle Trailer

What the Bicycle Trailer is Intended for:

Extrawheel trailer is designed to be pulled by any bike with a wheel diameter of 26”, 27”, or 28". It is designed to carry loads up to 66 lbs. (30 kg). (The Extrawheel trailer doesn’t prevent you from loading the bike with bags as well.)

Instruction Video

Package Contents:

  1. Trailer frame with a wheel, a mudguard, elastic mesh stretched over the mudguard, and an visibility flag with a pole.
  2. Mounting fork
  3. Quick release and two nuts
  4. Allen wrench
  5. Operating instructions

Preparing the Bike to Attach the Trailer

The quick release or nuts holding the rear wheel onto the bike have to be replaced with the special Extrawheel parts with ball-shaped ends enclosed in the package. You’ll need a15 mm wrench. You’ll only need to do this once; after hat, attaching and taking off the trailer will be quick and easy. Always be careful that the wheel is securely attached to the bicycle.



Bikes with unusual rear hubs that don’t use quick releases or ordinary nuts can use M5 screws in fender braze ons. To make sure the setup is as secure as possible, the M5 screws should be put through the frame so the head of the screw is on the inside of the frame and the treads stick out away from the frame. The special Extrawheel nut is then screwed onto the M5 screw. (See video.).

Preparing the Trailer

The fastening arms (fork) come adjusted for the majority of standard bikes on the market. However, you should check to make sure it fits your bike properly. Attach one arm of the fork to the mounting nut and then check to see that the other arm rests at the base of the other mounting nut. If the fork is the proper width, you should have to stretch it at least 1.2 inches (+/- 0.25”) (the length of the mounting nut).

If the fork’s width needs to be adjusted, loosen the screws on the joint using the enclosed allen wrench. After you’ve adjusted the width, retighten the screws being careful to not over-tighten them. (The screws should always be lubricated.) While retightening the rings, it’s a good idea to pinch them so their surfaces are on a single plane and the rings fit together snugly.

You’ll only need to do this once for each bike. After the initial adjustment, attaching and detaching the trailer will only take a second or two.

Next you need to attache the fork to the trailer. Be careful to not scratch the articulated tow bar when stretching the fork arms. Finally attach the visibility flag by inserting the pole into the mudguard.

Attaching the Trailer to the Bike

Now that you’ve had a little practice, you should be able to attach the trailer to the bike in no time at all. Standing on the left side of the trailer, hold the left fork arm in your left hand and hold the mudguard with your right hand. Tilt the trailer a little to the left so the left fork arm is below the bike frame, then attach the right fork to the mounting nut. Straighten the trailer and using your left thumb, push against the quick release or frame to spread the fork and position it to securely attach it to left mounting nut.

Safety and Operational Guidelines

  • You should position the load evenly on both sides of the Extrawheel trailer. Using the self-locking buckles, pull the cord on the net tight as shown on the fabric cover labels. (See the video.)

    • (See video.)
  • The trailer is more stable by having the heaviest objects closest to the ground.
  • It’s dangerous to carry loads—especially on busy roads— that are wide or shaped so that they might fall out of the trailer’s net, have sharp corners or points, or are heavier than the load capacity of 66 lbs.
  • For your own safety, as well as to others, you should always use the visibility flag. Make sure to connect the flag pole with the band so the flag isn’t lost.
  • You can use normal soap to wash the trailer.
  • It’s important to keep the reflectors and flag clean. The flag can be washed without removing it from the trailer.
  • Never sit on the mudguard—if you do, you will damage it.
  • To avoid excess wear or cutting of the fabric and the net, wrap hard loads in cloth or pad them.
  • Extreme overloading can cause the lower edges of the cover to rub against the wheel. You can prevent this by tightening the net-holding cord. (See video.)
  • The net-holding cord has a tendency to loosen if the net is empty or nearly empty. One solution is to eliminate the loop by grabbing the cord by the knot that connects it to the buckle and pull the knot. This will will rethread the cord through the buckle loop. (See video.)
  • The attached belt can be used to not only secure the load, but also to carry the loaded trailer.
  • The ball-shaped surfaces of the joins should be lubricated to prevent corrosion.
  • To get access to the wheel, slip the lower edges off of the pins and gently widen the lower edges by pulling them apart.
  • In an accident, the fork allows the trailer to detach. The trailer may detach unexpectedly due to: 1) Overloading. 2) Backing up and turning the trailer while not leaning the bike, 3) Sand or dirt in the locking joints. 4) Hitting something (like a curb) at a sharp angle.

    • Download these instructions

    instructions.pdf