Single Wheeled Bike Trailer

Step 7 Attaching the Top and Bottom Frames

After attaching the wheel, I then added the top frame to the bottom frame. I used the hacksaw to cut the top frame ends at an angle (to match the angle it would meet the bottom frame) and then used the grinder to taper the ends (again, to increase the contact surface area between the frames).

Once the top frame was sized properly, I brazed the vertical supports to the bottom frame and then, using a clamp, held the top frame to the bottom frame and attached it to the supports as well. The last step in attaching the top frame was brazing the ends to the bottom frame. In order to maintain contact, I used clamps to hold the top frame taut against the bottom frame.

After brazing the frames together, I decided to add a couple more vertical supports so that the top rail was more secured when attaching bungee cords. Measuring is much easier when you have a specific place in mind, so 15 minutes later, they were cut, tapered and brazed into place.

NOTE: I had originally planned on using three vertical supports in the front of the trailer, but took one off after I came up with a better solution for attaching the trailer to the bike. You can see the support that was removed in the pictures.