Thread: Frame Safety

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I am an engineer, and I'm still pretty careful. The photo is of the rear axle 4-bar bracket on the A-Bone that I built back in the mid eighties. This happened when I hit second gear.

Note that there's no boxing at all to support the lower bar. That might be fine in tension, but when you hit the loud pedal, the pinion tries to rise, and those two flat straps have nothing to stabilize them under compression.

I was able to bend them back into shape, then I welded boxing plates on the front and back.

That bracket came from TCI, but I see that P&J still makes them that way.