tomjasz said:
You DON'T NEED TO SHIM UNDER the fixing plate. There is NO issue except the one you are making up and it's unfounded, without merit, and that of an inexperienced builder with less sense, than cents, apparently. So you sit, with no riding, when what's really lacking is common sense. Thousands of us road our 01's and 02's with a single lockring. The fixing plate fits against the BB and the spacer on top of that. You COULD be riding instead of niggling about details you remain clueless about. You can lead lead a horse to water...
Actually, you're just a hack that would build something dangerous and prone to failure. BBS01s and BBS02s DO work on 68s, BBSHDs do not, so you're arguing in a vacuum. No, you can't just have a 5mm misalignment on the motor mounting plate. No, you can't just bend the 'tabs'. You're being ignorant as well as obstinate.
From the article posted above:
"Many people are unaware of this fact, but yes you can get a 73mm if you wish, but the flip-side is the 73 mm
only fits 73 mm shells <emhasis added>, making the 68 mm more versatile to swap to another bike someday, just a little food for thought."
At any rate, my spacers finally arrived. As the drawing on the Bafang site indicated, the 73mm kit IS perfectly centered (as per cranks) on a 68mm frame when the drive side is against the BB, so a 5mm spacer under the mounting plate (non-drive side) is the correct solution for centered cranks. Unfortunately, with this setup, the Luna Eclipse chain ring (with more offset than stock) only had a fraction of a mm clearance to the chain stay. I figured it would likely end up rubbing due to frame flex, so opted to spit the difference and put two half-spacers on either side, yielding only a 2.5mm crank/frame offset which I doubt I'd notice. That also gave fairly close to an optimal chain line.
I also used the epoxy-blob trick to reduce pressure on the down tube from drive torque.