On Tuesday, November 14, 2017 at 5:55:49 AM UTC-7, Belopsky wrote: > > Anyone think this could work? 120mm O.L.D. > https://janheine.files.wordpress.com/2013/09/hub_gb_hf_5sp_6sp.jpg > > Could use spacers and the like if you want to run a true single speed > setup or could maybe make a 5speed work too>? >
I was tempted to make an obvious comment like "if you don't already own the frame, and what you really want is gears, then why...." but, on further reflection, I think this might actually be genius! * If* the bike's chainstay length and math happened to align, you could achieve a very clean looking stop-and-swap geared bike with a lot of useful range. Theoretically, you could use a triple front and three cogs in back which would give you three very distinct gear ratios, which would barely even change the effective chainstay length at all, and which would all having perfect chainlines. Something like: 46/12, 38/20, & 30/28. But... *depending on where the hub happened to fall* along the length of the dropout slot when in those gears... and *assuming Riv makes the slots long enough to take up an 8-tooth difference *like they did with the QB and SO... you could potentially add a 4th rear cog at the end, which could ALSO work with the smaller chainring. For this example, a 36. If you used the remaining space on the cassette driver to adjust the side-to-side location of the cogs so that their chainlines fell exactly half way between those of the chainrings , EVERY chainring would work with two distinct cogs. 6 gears total! (You'd never have a "perfect" chainline in any gear combination, but that doesn't seem to be an issue in practice anyway.) So that would potentially give you something like: 46/12, 46/20, 38/20, 38/28, 30/28 & 30/36. Or, stated as ratios, 1: 3.83, 2.3, 1.9, 1.36, 1.07 & 0.83. I suppose that smaller increments would work too, if necessary. Just make sure you get quick release axles, or you'll never even bother taking the time to swap and take advantage of it. -- 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 https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
