Originally Posted by goldenskeletons

i "lost a crankarm" when i first started messing on a ****ty conversion i bought used. the cranks were sugino, but i have no idea what kind, and i have no idea how old they were. anyway, the bolt in the non driveside started coming loose pretty frequently, and one morning it was really shifty. then it started to wobble pretty badly when i was going over a bridge. it was still early enough in the morning for there to be a decent amount of commuter car traffic, so i kinda had to suck it up and keep moving at pace, because there's nowhere to pull over on the bridge.

anyway, the bolt was super loose and the crankarm went off with it once i got into the intersection on the other side. now imagine a kid on a bike one legging it through traffic to the shoulder with a box on his handlebars and girlie screaming like a champ, then running back into traffic to grab the arm before it got hit by a van.

the bolt and the BB spindle were fine, but the arm was pretty chewed up where it fits onto the taper.

so i stand behind my stance on higher quality cranks. but you are right that there really isn't a worthwhile difference in weight with the RD's and 75's. oops!