the best way to do a rigid is to do luck Scoot did, and cut the frame and weld in tubes to replace them... a longer driveshaft is not needed as long as you keep the stock length wheel base. If you want to stretch the rear, then yes you need a longer driveshaft. If you have decent welding skills, building a longer driveshaft isn't hard...search ebay and buy a second drive shaft, cut them both down to frankienstine one shaft to the other. I can get you more info on this from a chopper forum i subscribe to if you decide to go this way... and btw, a brand new bike builder and welder made a longer shaft for a Honda Nighthawlk that looks wicked sic and is very durable.
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