I tried to combine two old bikes, BMX and MTB. The combination makes the bikes into a recumbent bike.
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Step 1: Cutting the Frame
Cut the MTB frame into smaller one. Joint the frame into smaller.
Step 2: Welding and Joint the Bikes' Frame
After grinding the frame (removing the paint) it can be welded.
Step 3: Finalizing
But it still needed other parts to improve my simple recumbent bike.