I believe this is more a product of certain manufacturer failures, rather than the design itself. Sugino makes many cranks, and the XD is the only 1 that uses the hidden bolt design !
This includes the 75, RD , Alpina and Mighty series of cranks ... all "traditional" or whatever we can call that design. The 75's have been around a long long time . On Friday, December 20, 2013 3:56:25 PM UTC-5, Andrew Drummond wrote: > > The hidden chainring bolt, while a pain in the ass and kind of ugly, is a > result of getting rid of a pair of stress risers - on cranks where two of > the spider arms straddle the crank arm, there's a small angle where cracks > can start, because the web is thin and is subject to constant stress cycles > (see old Campy cranks for a popular example). When one of the spider arms > is moved under the crank arm, those angles are opened way up and the stress > risers are greatly reduced. Sort of like the point on the bb end of the > Ritchey logic crank - it looks weird, but prevents the crank from cracking > from one corner of the square tapered hole. > > Andrew > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/groups/opt_out.
