I converted my Hunqapillar from a 24/36/46 triple to a 24/38 plus double FD and had no issues shifting whatsoever. Could go to 24/40 for the maximum 16 tooth differential.
I have that differential on the Bike Friday with the René Herse 36/52 and have no issues shifting either. You can keep the FD if you just go double ala Rivendell, meaning a triple crankset with the large ring replaced by a guard. Adjust the limiter screw on the outside and you should be fine, I think. Otherwise you need a double FD. René On Wednesday, June 1, 2016, dougP <dougpn...@gmail.com> wrote: > If you can find a 7 speed 11-28, you will give a similar low to what you > have now with a 24 inner ring, 24/28= 0.86; 26/30= 0.87. On the high end, > 38 x 11 (3.45) is not far off 46 x 13 (3.54). > > Most wide-low doubles utilize a cogset of at least 3:1 range (11-34; > 12-36, etc) which gets into more cogs. Another thought is the 10 tooth > changes in your current chainrings make for easy shifting. Dropping from > 38 to 24 is a more dramatic shift. If your current range is sufficient, > and your shifting reliable, it begs the question of "why change?". > > dougP > > > On Wednesday, June 1, 2016 at 8:42:51 PM UTC-7, Lungimsam wrote: >> >> History: >> I use a 26-36-46 up front right now >> I use a 13-30 7-speed cassette in back (avoids autoshifts with friction >> that way). >> Bleriot. 135mm d'outs in the back. >> This enables 95% of the hills I ride without dropping to the granny ring. >> But sometimes I must use it. Happy to do so, too. >> I ain't giving up friction shifting, and I ain't giving up 7-speed. So >> don't even. >> >> >> 1. I know if I go to compact double, a 24 chainring will be the inner >> ring, so that is settled. In stone. Because of the climbs I sometimes >> encounter. >> >> But it is selecting the outside ring that gets me. >> >> 2. The majority of hills where I ride I ride in the 36 x 30 combo. >> Anything harder and I dump down to the granny. 26 x 30. >> So there is no way I could ride a 40-something big ring. So I am confused >> about how to select the best toothcount for me for my big ring so that I >> don't alos spin out on the downhills, yet can do the uphills without the >> granny dump. >> >> 3. Should I just use the ring that would enable me to cruise flats in the >> middle of cassette? >> 4. Should I also then change the cassette to the widest 7-speed possible? >> >> I once tried a racer geared compact double bike and it wasn't for me. No >> low enough small ring and too big of a big ring resulted in lots of FD >> shifting, which I am trying to avoid. >> >> >> -- > 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 > <javascript:_e(%7B%7D,'cvml','rbw-owners-bunch%2bunsubscr...@googlegroups.com');> > . > To post to this group, send email to rbw-owners-bunch@googlegroups.com > <javascript:_e(%7B%7D,'cvml','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. > -- 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.
