I don't know if it's solely about the "over locknut" dimension. Except for most Shimano cassette hubs, all other cassette hubs also have the right side bearings (that supports the hub body) very close to the centerline of the axle.
Shimano has a patent on attaching the hub body to the freehub and putting the right side bearing on the right side of the freehub itself, thus transferring the load as far outboard as possible. The other manufacturers (Campagnolo, Mavic, to name but two) have essentially the freewheel hub design, except in place of an unsupported freewheel, there is a freehub body usually supported by two bearings. These two bearings only support pedaling forces and you can even remove the entire freehub body without impacting the ability of the wheel to carry load. So what this means is that all except pedaling loads are still supported by a left bearing that sits very close to the left dropout, and a right bearing that sits very close to the centerline of the axle. There are advantages to the new design though. For example, the axles tend to be larger and they are usually only threaded at the very ends. Big, most unthreaded axles surely must be stronger than smaller axles with a long section of stress-riser threads. On Feb 17, 3:24 pm, bfd <bfd...@gmail.com> wrote: > > I posted a question about the difference between NR and C-Record fw > rear hub on another forum and here is one excellent and plausible > explanation: > > "Functionally I think the two hubs are equivalent, however the main > difference is the width of the dropouts, the "over locknut" > dimension. > > Since the C-records were used on bikes that had 7 and sometimes 8 > speeds, they frequently had over locknut dimensions of 130mm. At > 130mm, the bearing on the hub drive side is pretty close to the wheel > centerline! So there's a bending moment on the axle and a stress riser > at the inner edge of the drive side cone. > > NR axles were usually set up for 120 or 126mm over locknut. > > And of course, a heavy rider with a powerful sprint will put far more > load on the rear axle than a small rider. > > The quest for more rear cog speeds is part of what led to the cassette > hub which has an extra bearing at the end of the axle, near the drive > side dropout." > > Hmmm, so may be it was a combo of running a 7spd fw and my fat > ass....Good Luck! -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
