i dig that tank!blue44067 said:my bike has a "half assed hard tail" too, just struts welded to my swinger and to the seat bars I really like your design. What is that tank from? One thing I've noticed with mine is that the back wheel seems to wander under the bike at high speed on gravel roads. I think its because I haven't welded the swing arm to the frame, and my struts are too small in diameter. Anyways, I like the look you've got going there.
That was magnificently said!barnicle said:So I just want to remind everybody this is the bob/chop section nothing that happens hear ends up being better or safer than it was in the beginning.
Once you have made you comments, and its clear the builder is committed to his design, butt out, and let the man build!
Seriously? Look at the load paths on this thing. As the neck gets loaded vertically, the bending moment is exactly where the backbone is preloaded--out of sheet metal. That's going to force those tiny upper engine mounts down and will ultimately fail. One pothole or a rough railroad crossing will ensure that will happen. But that's nothing...iagsxr said:Where and why?
Well said Dave. We will enjoy the pics. Keep them coming.dynamitedave said:I'm not even going to bother arguing with you guys. The frame is good, the bike isn't going to break in half. Shut up and enjoy the pictures.
The backbone has sheet metal in the construction (area "B" above) of it but unlike a stock CB350 there is a 1.25" steel tube (3/16" wall thickness) that is welded into the neck and is fully welded through the remaining stock lower backbone (where the top engine mount is) and then welded to the down tube at the rear of the engine. There is also extra support connecting the pipe to the neck that was not shown on this thread. The sheet metal piece I welded in is 16 gauge (approx. 1/16" or 0.06" thick which it comparable or better than stock) and is welded to the neck and along the backbone that I put in. The angle of the triangle that the sheet metal makes is appropriate to distribute the load along the backbone of the bike. If the angle was too steep it would not provide enough rigidity to support the load. The shape made is almost a perfect geometrical triangle.motofiaccone said:That backbone? .090" sheet metal which is trying to buckle in it's stock form.
This thing isn't cardboard, its steel. Do you really think a 250lbs man just sitting on the bike would cause the frame to break? Seriously? I'm only 170lbs so I guess I'm good to go right?motofiaccone said:A 250lbs man just sitting on the bike could do the trick.