> On Thursday, Mar 17, 2005, at 16:45 US/Pacific, gpvb1@comcast.net wrote:
> > I've seen lots of completely broken crank arms of many brands. What I haven't seen (or been told first-hand about) is a vintage R/SR one that broke at the infamous spider crack. I can only go by data in hand - not stories.
> >
> > Scroll down what page?
>
> Sorry it stripped my link for some reason.
>
> or
> http://tinyurl.com/
>
> I know quite a few other folks that have never seen one with their own
> eyes. This is one of the reasons we used to keep a drawer full at the
> now defunct Bikesmith in Seattle.
> best,
> Brandon"monkeyman"Ives
> Coeur d'Alene, Idaho
Got it..... "One." :-) (I'm pretty sure that I had seen that pic. before, now that I think about it more). As evidenced by all of the data out there, many, many brands of forged aluminum cotterless crank arms can and did fail in fatigue in many ways, usually at high mileage and/or after some sort of blunt-force trauma. All the more reason to be watchful of old aluminum crank arms, just like old aluminum stems, handlebars, rims, etc. etc. (Not to mention all of those "exotic" and CNC'ed cranks that seemed to break with alarming frequency...). The data says that the majority (of the small percentage of Campy R/SR arms that failed) broke at or near the pedal eye. Some broke in various other places on the arm. So did the majority of the other competing brands out there at the time. Greg Parker Ann Arbor, Michigan