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I'm pretty sure the spider, chainring and chain will counter act the the weight
They won't, because they are all centred on the spindle. Of course, at only 100rpm, the eccentric load on the BB will not be noticeable, and all bicycle crankshafts have a huge rocking moment anyway, but he's right in principle.
gbj_tester
I'm pretty sure the spider, chainring and chain will counter act the the weight