Hi Patrick! I don't remember the hub, and I searched my email for hubs I bought in 2009 – I was only able to find the one I built into the front wheel. However! This exercise show something loose in my head and I now recall how I made the monocog into a two-speed (before whatever I did to add a third cog). I replaced the locking by a fixed-gear cog. Here's a text diagram:
Your current setup has: spokes - spacer - splined cog - lockring Change it to: spokes - splined cog - spacer - threaded cog I hope this helps! -Wes On Saturday, October 28, 2023 at 9:51:46 PM UTC-7 Patrick Moore wrote: > Do you recall the hub you used with the unicycle rim? I seem to recall BMX > freehubs that had room for 2 cogs. > > On Sat, Oct 28, 2023 at 9:16 PM Wesley <brooks...@gmail.com> wrote: > >> Yeah, it looks marginal to get a second cog in there with a narrower >> spacer. According to Sheldon Brown, 9-speed cogs want a 2.54 mm spacer >> between the cogs: https://sheldonbrown.com/cribsheet-spacing.html >> >> I now remember that my monocog became a three speed after I built it a >> pair of winter wheels (I used a pair of very wide unicycle rims for maximum >> float). So I probably kept the original when intact and built a new hub >> into the new wheel. Sorry for not remembering, the bike has been out of my >> life for about eight years. >> >> -W >> On Saturday, October 28, 2023 at 1:17:17 PM UTC-7 Patrick Moore wrote: >> >>> Wesley: Sorry, I missed this post in the thread volume. >>> >>> I'm pretty sure that my Monocog's freehub body takes only 1 cog; see >>> photo with single 3/32" cog and 2.5mm spacer: the splines end right after >>> the spacer. >>> >>> Am I looking at things right? I hesitate to remove the wheel because >>> getting the tire exactly centered in the chainstays, with 2-3 mm clearance >>> a side and the inevitable tire runout, while also adjusting chain tension >>> is a pain. >>> >>> [image: image.png] >>> >>> On Tue, Oct 17, 2023 at 3:56 PM Wesley <brooks...@gmail.com> wrote: >>> >>>> Hey Patrick, >>>> My recollection of my monocog was that the freehub had room for three >>>> cogs. I think there were spacers on the hub that covered up most of the >>>> free hub - remove the locking and you can do adjust the spacers as >>>> necessary. If yours is the same, then you could just keep that wheel and >>>> put the additional cogs onto it. >>>> >>>> And, in case I wasn't clear in my earlier response, I think there is >>>> plenty of adjustment room in the disc brakes to accommodate the rear axle >>>> being adjusted in the dropout. >>>> -Wes >>>> >>>> On Tuesday, October 17, 2023 at 10:44:19 AM UTC-7 Patrick Moore wrote: >>>> >>>>> That's interesting, and after blundering into a few search result >>>>> pages about money markets and currency conversion I got: >>>>> >>>>> http://www.monebikes.com/read-me/ >>>>> >>>>> But he says nothing about adjustable chainstays, >>>>> >>>>> Still, he does talk about weird possibilities like 3" tires and drop >>>>> bars, so I must investigate. >>>>> >>>>> Really, though, to conclude this question, it seems that I can either >>>>> have a very simple bike with disc brakes as long as it's a single speed, >>>>> or >>>>> I can accommodate 2 cogs using some niche, complex technology. I think >>>>> I'll >>>>> either settle for a fixed drivetrain (no rear brake, no problem) or get >>>>> off >>>>> and walk. Rear rim brake not option since I want to use disc rims. >>>>> >>>>> On Tue, Oct 17, 2023 at 8:44 AM Coal Bee Rye Anne < >>>>> lionsrug...@gmail.com> wrote: >>>>> >>>>>> I have no personal experience with single speed disc nor >>>>>> Rocker/Slider or any of the existing dropout configurations being >>>>>> discussed >>>>>> other than keeping a mental catalogue and casual interest of such things >>>>>> as >>>>>> I discover them... but what about telescoping chainstays? >>>>>> >>>>>> I recall seeing a few interesting options including a build that Rick >>>>>> Hunter did with a bottom bracket positioned wingnut to adjust chain >>>>>> tension >>>>>> with a form of telescoping chainstay (I forget what that particular bike >>>>>> or >>>>>> design was referred to but I think it had a rigid fork, 26+ tires, disc >>>>>> brakes, upright riser Hunter bars, and a cow pattern custom frame bag... >>>>>> in >>>>>> case that helps ID it or dig something up for further review from the >>>>>> interwebs!) >>>>>> >>>>>> Another is the design currently used by Cjell Mone of Mone Bikes >>>>>> referred to as the Mone Changer. I couldn't find an actual page >>>>>> discussing >>>>>> or highlighting the chainstay design itself but believe he builds them >>>>>> into >>>>>> various frames as requested. Here's a snippet from the FAQ page on his >>>>>> site. >>>>>> >>>>>> How do I work them Monē Changer dropouts? >>>>>> >>>>>> - Remember, there are 5 (not 4, don't forget the caliper adaptor >>>>>> ones) bolts to loosen. To lengthen, sit on the saddle and hold the rear >>>>>> brake, give a couple gentle bounces...that should do it. To shorten, get >>>>>> your chain started on your single speed cog and chainring and pedal it >>>>>> around. straighten the tire in the chainstays and tighten 6 bolts. If >>>>>> you're running gears your penance is putting the bike in the stand, >>>>>> throwing a foot on the BB and pulling the rim to the front. >>>>>> >>>>>> >>>>>> Since you are going the custom route for this hypothetical bike I >>>>>> figured I'd add these possibilities to the mix : ) >>>>>> On Sunday, October 15, 2023 at 6:12:06 PM UTC-4 Patrick Moore 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-bun...@googlegroups.com. >>>>>> >>>>> To view this discussion on the web visit >>>>>> https://groups.google.com/d/msgid/rbw-owners-bunch/a991d3aa-5236-4990-a1a1-65528196c0b9n%40googlegroups.com >>>>>> >>>>>> <https://groups.google.com/d/msgid/rbw-owners-bunch/a991d3aa-5236-4990-a1a1-65528196c0b9n%40googlegroups.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. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to rbw-owners-bun...@googlegroups.com. >>>> >>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/rbw-owners-bunch/fe30b462-2932-4edb-b589-9237af7776f9n%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/rbw-owners-bunch/fe30b462-2932-4edb-b589-9237af7776f9n%40googlegroups.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. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to rbw-owners-bun...@googlegroups.com. >> > To view this discussion on the web visit >> https://groups.google.com/d/msgid/rbw-owners-bunch/670da639-0133-43b1-8254-ae2b94d36d8bn%40googlegroups.com >> >> <https://groups.google.com/d/msgid/rbw-owners-bunch/670da639-0133-43b1-8254-ae2b94d36d8bn%40googlegroups.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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