On Saturday, April 27, 2024 at 12:41:12 PM UTC-5 Patrick Moore wrote: But I keep coming back to theoretical efficiencies: IIRC, the gearing effect of tooth jumps in back are more or less double what they are in front. So the question is, how to get just 2 or 3 big jumps in back without a IGH.
Just build a 3-speed cassette and fill the rest of the space with spacers. Bill's 46-36-24 is jumps of 25% (46-36) and 41% (36-24). An equivalent 25% jump in back would be 15-19 (24%), 16-21 (27%), 17-22 (26%), 18-23 (25%). An equivalent 41% jump in back would be 16-24 (41%), 17-25 (39%), 17-26 (42%), 18-27 (41%), 19-28 (39%), 19-29 (42%), 20-30 (41%), 21-31 (39%), 21-32 (42%), ... A very close equivalent to the 46-36-24 in front would be 15-19-28 in back. Pair that with a 44T chainring and you'd have 42-63-79 gear inches on 700x32C tires. At 22t of required chain wrap, take your pick of any rear derailer. I would expect much crisper shifting with that setup than a wide-range triple up front. Combine it with a compatible index shifter and you'll have a nice 3-speed externally geared hub. If you were so inclined. Ted Durant Milwaukee WI USA -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/8c3d83e1-dbc1-4674-976a-9bc54769720cn%40googlegroups.com.
