Patrick: This is fun!
I am assuming a 28" actual diameter wheel and more or less readily available parts (ie, no 31 t rings or 25 t cogs). A. Vertical dropouts. 1. ENO + 40/36/34 chainrings; 17/20 Dingle; flip side (don't backpedal) 22 t cog. 66, 50, 43 gi. 40 + 17 = 57 teeth. 36 + 20 = 56 teeth. 34 + 22 = 56 teeth. Only 1 tooth's worth of axle movement, which the ENO ought to handle. I'll bet that if you keep your chain taut and the rings centered, the wee chain offset will be fine if yu center the 36 in the middle of the Dingle. The Surly 22 t cog is 3/32, so 9 speed chain will work (9 speed required for Dingle). http://www.velomine.com/index.php?main_page=product_info&products_id=3837 <http://www.velomine.com/index.php?main_page=product_info&products_id=3837Why> Why would this require a proprietary cog? They didn't used to; the 2 ENOs I owned took regular screw-on cogs. Also, I don't see why this setup would not stand up to any torque less than Marty Nothstein would put out at max effort. B. Horizontals 1. S3X (If *only* the idiots had made it direct/-75%/-56.25%, or else direct/-90%,/-75%; in fact, it's direct/-25%/62.5%. But if you can stand the lash, with a 42 t ring and an 18 t cog and the presumed 28" tire, you'd get 65, 49 and 41 gi. Some people don't mind the lash. 2. Fixed/fixed hub. I've played around with this, and with stock hubs you'd have to use a Dingle on one side to get 3 gears total, so no different from A (1) above. BUT! 3. Get Phil to make you a fixed/fixed hub that will take 2 individual fixed cogs per side; at least, 20 years ago they told me they'd be happy to make a fixed/- cog that would take 3 cogs on one side; $400 in 1998 dollars; I regretfully demurred. But with this, the sky's the limit: 36/32 X 15/18/22; arrange the cogs as you wish, one side or 2/1. 67, 50, 41 gi. Actually without stretching the dropouts' capacity you'd also get a 36X18 gear for 56 gi. 36X15 = 51 teeth total. 32X18 = 50 teeth total. 32X22 = 54 teeth total. And: 36X18 = 43 t total. Thus no more than 4 teeth difference, or 1/2" total axle movement. On Wed, Feb 13, 2019 at 12:37 PM 'Deacon Patrick' via RBW Owners Bunch < [email protected]> wrote: > Looking for ideas for making Boots a fixed gear Allways Adventure Beastie > (I’m currently leaning toward option 1). > > *Goal*: Three fixed gears that can be simply shifted on the road/trail to > cover all terrains. Gears needed: > *High*: 60-70” for long road descents. Yes, I could go with a lower gear > freewheel, but fixed is far preferred for me. > *Main*: 50” for most terrain, at least round these parts. > *Low*: 40-43” for steeper trails, snow, mud, mush, et al. > > To head off the inevitable “why fixed, that’s nuts!” responses: I’m set on > fixed. Why? I’ve constant neurological vertigo as part of my bludgeoned > brain, and fixed gear means more feedback for proprioception to work and > helps me recover as I ride 2-4 times as much as freewheel riding on the > same bike. Plus, I love the way it rides, so even if my brain heals to the > point this is no longer the case, I may well stay fixed because I love it. > > Options I see: > 1. White Ind. ENO Eccentric Hub on stock frame. I’ve watched videos of > gear tensioning and it looks simple enough with practice, even with a > loaded bike. Challenge: Fixed side requires WI proprietary cog, not dingle > option. I see two ways to address this. A. shift by removing the lock ring > and swapping cogs, having a matching chainring for each of the three gears > to keep the total number of teeth identical. B. Single cog/dingle cog > “locked” onto the freewheel side, same triple chain ring setup. Either way, > I’d go for roughly a 4t delta in the cogs, with the same for the chainrings. > > Advantages: keeps Boots with the option of using freewheel in the future, > lower cost (presuming it works and the ENO hub holds for fixed gear > bikepacking). WI says it isn’t designed for fixed gear, let alone > bikepacking, but they know it can work on a steel frame (no go on aluminum > for lack of grip). > > Disadvantages: May not hold under high torque load. Worst case scenario is > I have to re tension the chain, WI says. They say the hub is rock solid. If > this happens too often, I’d need to go to option two. > > 2. Replace the dropouts to be horizontal. Configure similarly to my > current Quickbeam and Hunqabeam. > > Advantages: known, solid, reliable, purpose built for fixed gear. Tested > for bikepacking on all terrains and works great. > > Disadvantages: cost, including a repaint is $800-1,000. > ~~~ > > Anything I’ve not thought of? Anything to consider? Experience abusing an > ENO eccentric hub similarly? Best practices for a fixed cog locking on a > freewheel hub? Thanks! > > With abandon, > Patrick > > www.MindYourHeadCoop.org > www.CatholicHalos.org > www.DeaconPatrick.org > > -- > 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 [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/rbw-owners-bunch. > For more options, visit https://groups.google.com/d/optout. > -- *------------------------------------------------------------------------------------* *Still 'round the corner there may waitA new road or a secret gate,And though we pass them by today,Tomorrow we may come this wayAnd take the hidden paths that runTowards the Moon or to the Sun.* --- J.R.R. Tolkien ----------------------------------------------------------------------- Resumes, LinkedIn profiles, bios, and letters that get interviews By-the-hour resume and LinkedIn coaching Other professional writing services Expensive! But good. http://www.resumespecialties.com/ Patrick Moore Alburquerque, Nuevo Mexico, Etats Unis d'Amerique -- 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
