Thanks, but I don't want that complication. I want (if I can get it) the simplicity of my Riv customer gofast: QR rear hub, Dingle cog, long horizontal dropouts. I don't necessarily need these means but I do want the same end.
On Sun, Oct 15, 2023 at 4:31 PM Eric Daume <ericda...@gmail.com> wrote: > The simplest solution is to also use two chainrings, matching the cog > difference (for instance, with a 16/18 Dos freewheel, use 42 and 44t > chainrings). Then the 44/16 and 42/18 have the same chain length, and the > rotor to pad relationship doesn't change. > > Or just use a disc front and a rim brake rear, and a forward facing > horizontal dropout (like typical UJBs have) > > Eric > > On Sun, Oct 15, 2023 at 6:12 PM Patrick Moore <bertin...@gmail.com> wrote: > >> Thinking out loud; help me clarify my thoughts. >> >> I think of devising a Monocog replacement, with 622X76/29X3" wheels, but >> instead of a mono cog, with a duo cog. This hypothetical bike would have >> disc brakes. I don't want to use a chain tensioner, and I prefer to take >> advantage of the greater gear ratio differences between cogs of different >> sizes compared to rings with the same tooth differences, and of the >> consequent smaller axle movement required to adjust chain slack, so the >> multiple cogs would be in the back and not on the crank. >> >> On my beloved 1999 Joe Starck Riv Road Custom fixie I use a 17/19 Dingle >> on a Phil hub with a QR axle; it's very easy to stop, flip the QR lever, >> move the chain, align the wheel, and tighten the QR. >> >> That's what I imagine for the Monocog replacement. >> >> 1. Disc brakes. But this bike would have disc brakes. I'd probably not >> need more than a 2-t cog difference, but will your typical caliper/rotor >> setup accept the 1/4" axle movement? (1/8" of axle movement is required -- >> so they say; I've never measured it and take it on faith -- to accomodate a >> 1 tooth sprocket difference.) >> >> 2. Two cogs. How to get 2 cogs onto a suitable "ss" hub with a freewheel. >> The DIngle isn't made anymore and in any event wasn't made -- am I right? >> -- with 2-teeth gaps. The Monocog has a freehub designed to take 1 single >> Shimano-spline-type cog; there's no room for a second cog. >>>What options >> does one have to get 2 cogs with a 2-tooth difference onto a hub suitable >> for a QR axle? >> >> I realize that I could just use an old 7 speed Shimano freehub, and I >> might end up doing that, but I'd prefer to have a hub that does not require >> a wide stack of spacers. >> >> 3. Axle type and dropouts/trackends/thru-axle holes. I know that long >> forward-facing horizontal dropouts, a QR axle, and a hub with 2 cogs on 1 >> side allows very easy manual shifting, as this sort of shifting goes. I am >> also pretty sure that a good builder can use 135 mm OL spacing and still >> give me the stay clearance I need for true 3" tires, so I'm inclined to >> stick with this very old-fashioned wheel attachment method. >> >> But if there are other wheel attachment methods that allow you to easily >> move the chain from one cog to another, I'd be interested to learn about >> them. Sliding dropouts? >> >> Are there any other things to consider ? >> >> Thanks, Patrick Moore, who had a nice ride to church and back today on a >> pretty Fall day riding the Monocog with 72 mm tires and a single 65" gear >> despite the bosque trail sand and the rear tire knobs occasionally >> "whisping" on the chainstays (I fixed seatstay clearance with a hammer). >> The Silca Impero with Campy head and the Road-style BB7s pulled by non-aero >> DC levers are ironic but in fact work very well. When braking from the >> hoods you simply pull from a bit lower down on the lever; and the Impero's >> fat barrel moves lots of air fast into low pressure tires; 13 psi this >> morning and it could have been lower. >> -- >> >> ----------------------------------------------------------------------------- >> Patrick Moore >> Alburquerque, Nuevo Mexico, Etats Unis d'Amerique, Orbis Terrarum >> >> ----------------------------------------------------------------------------------------------------- >> >> Executive resumes, LinkedIn profiles, bios, letters, and other writing >> services. >> >> >> ----------------------------------------------------------------------------------------------------- >> >> *When thou didst not, savage,* >> >> *Know thine own meaning, but wouldst gabble like* >> >> *A thing most brutish, I endowed thy purposes* >> >> *With words that made them known.* >> >> -- >> 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/CALuTfgvSea80hxHZ7mMEUxzpaR551T6Q5%3DNLpAvr%2B0QOQ3rh6g%40mail.gmail.com >> <https://groups.google.com/d/msgid/rbw-owners-bunch/CALuTfgvSea80hxHZ7mMEUxzpaR551T6Q5%3DNLpAvr%2B0QOQ3rh6g%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- > 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/CAHFNW5BLmG4%3D1ydCiu5yZ2-Z-2127DHs6%3DuozLQd-a0d7gzY1w%40mail.gmail.com > <https://groups.google.com/d/msgid/rbw-owners-bunch/CAHFNW5BLmG4%3D1ydCiu5yZ2-Z-2127DHs6%3DuozLQd-a0d7gzY1w%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- ----------------------------------------------------------------------------- Patrick Moore Alburquerque, Nuevo Mexico, Etats Unis d'Amerique, Orbis Terrarum ----------------------------------------------------------------------------------------------------- Executive resumes, LinkedIn profiles, bios, letters, and other writing services. ----------------------------------------------------------------------------------------------------- *When thou didst not, savage,* *Know thine own meaning, but wouldst gabble like* *A thing most brutish, I endowed thy purposes* *With words that made them known.* -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. 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