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A different approach...(6 posts)

A different approach...Akirasho
Nov 1, 2001 7:13 PM
An interesting approach to BB stiffness... and (assumed) lighter weight.

I have not data on this design, but it looks as though the brunt of cycling forces applied through the BB shell are transferred mainly through the downtube and a bit to the DT/ST junction.

While it looks labor intensive, it might actually be better for the metallurgy during the weld process. The cable guides are extremely clean (and topside).

Anyone have experience with this design??

We abide.

Remain In Light.
Beautiful...does it work? Frame welders? (nm)Ahimsa
Nov 1, 2001 8:16 PM
looks like...DA
Nov 2, 2001 5:21 AM
a nice "ledge" for crap to collect.
Looks complicated..stronger maybe, but heavier.Chris Zeller
Nov 2, 2001 8:17 AM
I have no experience with this but it looks like it woukd be heavier than the standard design on account of the fact that the volume of the junction is certainly larger. It might be stiffer in the chainstay direction for the reasons you site but from some of the pictures of cracked frames that I've seen posted I woud be concerned about this one being weaker in the downward and forward direction. My thought is that most of these failures occur due to rider weight on the pedals (standing) especially as impulses are transferred to the frame as in hitting a pothole etc.
re: A different approach...TJeanloz
Nov 2, 2001 8:49 AM
Looks like an Ibis Ripley- the aluminum soft tail MTB. It should make the BB area laterally stiffer, though undoubtedly heavier.

The stay design appears to try to make the BB stiffer laterally and softer vertically (with the flat chainstay ends). It should work- but I'm not sure they've really solved a problem with it...
Airborne's version of this BB shell arrangementT.K. Malone
Nov 2, 2001 11:16 AM
Found this picture in an Interbike show report. It's a similar BB shell arrangement for an upcoming Airborne soft-tail MTB.