To yank this thread into the really weird: years ago I saw a description and photo of a -- what to call it? Derailleur multispeed non-coasting drivetrain? You couldn't call it fixed since it involved no fixed cog, only freewheels. I've been tempted to build one just for the over-the-top weirdness of it: on the level of that famous "Polish straight block and do we mean straight block freewheel".
IIRC, this was a standard, multispeed drivetrain on the right with two rings and as many cogs as you like, but with an added single ring and single cog reverse freewheel -- ie, it freewheeled as the pedals were rotated forward -- on the left. Since the right cogset was freewheeling, you could shift gears as usual, but the left drivetrain/freewheel prevented you from coasting because forward motion activated this drivetrain. The relevant point: I always suspected that, if you backed off pedaling in a high gear, that the pedals would immediately start spinning madly if the ratio of the left drivetrain was very low. On Thu, Oct 18, 2012 at 7:23 AM, Montclair BobbyB <montclairbob...@gmail.com> wrote: > Eric: > > It could occur accidentally; I'm more curious to understand the sheer > physics/mechanics of it, but you're right from a behavioral perspective it's > less likely to happen in a typical riding situation. > > (Pssst, Philip... don't let that dissuade you from attempting your > experiment... :) > > Bobby "Long as it ain't MY hub" Birmingham > -- Vote early, vote often, vote Rhinoceros! http://tinyurl.com/d7muj2t ------------------------- Patrick Moore, Albuquerque, NM, USA For professional resumes, contact Patrick Moore, ACRW http://resumespecialties.com/index.html ------------------------- -- 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.
