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Step 5Weld!
The front of your bike is all attached and the rear seatpost is "marking" the point where you will weld. Now you can rotate the upper frame up and prep the area where the seatpost will be welded on, and prep the end of the seatpost. Strip off any paint or plating there. Cut/shape the seatpost or the upper frame so you only have a small gap to weld.
Rotate the top frame back down so the seatube is touching it. Tighten your sandwich board clamps really well once everything is in position.
Weld it up! I found it was a lot easier to do this weld if I turned the entire assembly over so the handlebars and seat were on the ground, just like some people do when fixing a flat bike tire.
The result is a real sturdy attachment from top bike to bottom bike, and only required welding in 1 place!
Another idea I'm going to try is to use another fork instead of the seatpost on the bottom bike. Then welding an axle to the top bike where the fork would hit it. Then they can bolt together there too.
Rotate the top frame back down so the seatube is touching it. Tighten your sandwich board clamps really well once everything is in position.
Weld it up! I found it was a lot easier to do this weld if I turned the entire assembly over so the handlebars and seat were on the ground, just like some people do when fixing a flat bike tire.
The result is a real sturdy attachment from top bike to bottom bike, and only required welding in 1 place!
Another idea I'm going to try is to use another fork instead of the seatpost on the bottom bike. Then welding an axle to the top bike where the fork would hit it. Then they can bolt together there too.
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