So after several months of inactivity on the assembly of my custom due to
being busy on other things (selling house, selling 2 cars, moving, etc.), I
am about ready to begin working on it again. I have an 11 speed Dura Ace
12-28 cassette and an 11 speed Campagnolo Athena derailer. I have a bunch
of shifters of all sorts, so I wondered if any of them would allow indexing
of the mixed components. So my research says: the Shimano cassette has a
cog spacing of 3.69 mm. The Campagnolo derailer has a shift ratio of 1.5.
Divide the cog spacing by shift ratio to get required cable pull - 3.69 /
1.5 = 2.46. A 9 speed Dura Ace bar end shifter (or Microshift 9 speed - of
which I have both) has a cable pull of 2.5 - sounds like it might work if
the shifters mount up to the head tube mounted shifter bosses. Both the
derailer and the head tube shifter adapters have cable adjusters - so I
should be able to select which nine of the 11 cogs I use by adjusting cable
tension. The smallest nine give me 31 to 95 gear inches - plenty for
Florida, the middle nine give me 28 to 87, the big nine give me 25 to 81 in
case I venture into steeper territory (Rene Herse 42-26 crank). I may just
put Silver1s or Silver2s on and friction shift (25 to 95), but I will have
to try the indexing just to see if my math is correct (the curse of being a
mechanical engineer).
Laing
Delray Beach FL
--
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/f3c40e35-486a-4129-96c7-e65b32335da0o%40googlegroups.com.
