{"id":19835,"date":"2018-10-28T09:55:47","date_gmt":"2018-10-28T13:55:47","guid":{"rendered":"http:\/\/hawkdog.net\/wordpress\/?p=19835"},"modified":"2018-10-28T15:53:38","modified_gmt":"2018-10-28T19:53:38","slug":"extra-ordinary","status":"publish","type":"post","link":"http:\/\/hawkdog.net\/wordpress\/archives\/19835","title":{"rendered":"Extra-Ordinary"},"content":{"rendered":"<p>I fell over <a href=\"https:\/\/www.artstation.com\/artwork\/dOJ4W1\">this hilarious thought experiment<\/a> recently and thought I&#8217;d post on it as it touches on a couple of interesting topics: bike history and bike gearing.<\/p>\n<p><a href=\"https:\/\/www.artstation.com\/artwork\/dOJ4W1\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-19836\" src=\"http:\/\/hawkdog.net\/wordpress\/wp-content\/uploads\/2018\/10\/guillaume-bout-otb-carbone-or-persp-avant-1024x576.jpg\" alt=\"\" width=\"584\" height=\"329\" srcset=\"http:\/\/hawkdog.net\/wordpress\/wp-content\/uploads\/2018\/10\/guillaume-bout-otb-carbone-or-persp-avant-1024x576.jpg 1024w, http:\/\/hawkdog.net\/wordpress\/wp-content\/uploads\/2018\/10\/guillaume-bout-otb-carbone-or-persp-avant-300x169.jpg 300w, http:\/\/hawkdog.net\/wordpress\/wp-content\/uploads\/2018\/10\/guillaume-bout-otb-carbone-or-persp-avant-768x432.jpg 768w, http:\/\/hawkdog.net\/wordpress\/wp-content\/uploads\/2018\/10\/guillaume-bout-otb-carbone-or-persp-avant-500x281.jpg 500w, http:\/\/hawkdog.net\/wordpress\/wp-content\/uploads\/2018\/10\/guillaume-bout-otb-carbone-or-persp-avant.jpg 1920w\" sizes=\"auto, (max-width: 584px) 100vw, 584px\" \/><\/a><\/p>\n<p>The big advancement ordinarys incorporated that put them miles ahead of their <a href=\"https:\/\/en.wikipedia.org\/wiki\/Velocipede#Boneshaker\">boneshaker predecessors<\/a> was Eugene Meyer&#8217;s wire-spoke tension wheel. Lower weight and comfort &#8211; the boneshaker was instantly obsolete. The high-wheeler&#8217;s time at the top of the bike heap was brief &#8211; Meyer&#8217;s bike was introduced in 1869 and the first safety bicycle (what we think of when we say bike), <a href=\"https:\/\/en.wikipedia.org\/wiki\/Safety_bicycle#\/media\/File:Rover_safety_bicycle_of_1885_(right).jpg\">the Rover<\/a>, hit the pavement in 1885. In 1888 John Dunlop used pneumatic tires on a trike and the increased comfort for riders of small wheels was the high-wheel&#8217;s death warrant. Of course (because we are kooky primates), people still race Ordinarys &#8211; skip ahead to the 9 minute mark for actual racing action. And kudos to the small person wearing pink cowboy boots!<\/p>\n<p style=\"text-align: center;\"><iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/82biLWi2QUI\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>Why the huge wheel? I&#8217;m sure you know this already, but in a word, SPEED. Ordinarys are direct drive &#8211; one pedal revolution equals one wheel revolution. If you want to cover more ground per spin, increase the diameter (and thus the circumference) of the wheel you are turning.<\/p>\n<p>Not satisfied with 1:1, Mr. Bout modeled a unicycle\/Rohloff 14 speed hub mashup. At this point my smile became full on laughter. WHY? Why would you do this? The whole point of high-wheels is that the wheel defines the gear ratio!!?! \ud83d\ude00 But I got hold of myself &#8211; first, this is a modeling\/illustration exercise so, really, who cares, and second, it gave me something to think about.<\/p>\n<p><a href=\"https:\/\/www.artstation.com\/artwork\/dOJ4W1\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-19838\" src=\"http:\/\/hawkdog.net\/wordpress\/wp-content\/uploads\/2018\/10\/guillaume-bout-otb-carbone-or-rohloff-1024x576.jpg\" alt=\"\" width=\"584\" height=\"329\" srcset=\"http:\/\/hawkdog.net\/wordpress\/wp-content\/uploads\/2018\/10\/guillaume-bout-otb-carbone-or-rohloff-1024x576.jpg 1024w, http:\/\/hawkdog.net\/wordpress\/wp-content\/uploads\/2018\/10\/guillaume-bout-otb-carbone-or-rohloff-300x169.jpg 300w, http:\/\/hawkdog.net\/wordpress\/wp-content\/uploads\/2018\/10\/guillaume-bout-otb-carbone-or-rohloff-768x432.jpg 768w, http:\/\/hawkdog.net\/wordpress\/wp-content\/uploads\/2018\/10\/guillaume-bout-otb-carbone-or-rohloff-500x281.jpg 500w, http:\/\/hawkdog.net\/wordpress\/wp-content\/uploads\/2018\/10\/guillaume-bout-otb-carbone-or-rohloff.jpg 1920w\" sizes=\"auto, (max-width: 584px) 100vw, 584px\" \/><\/a><\/p>\n<p style=\"text-align: center;\"><em>A weird blend of concentric unicycle Kris Holm hub and Rohloff speed hub with what would be huge bearings. Is this even possible ? I don&#8217;t know. The Effigear cranks are borrowed from my previous bikes, and shortened.<\/em><\/p>\n<p>My immediate question was &#8220;I wonder what that gearing would work out to be?&#8221; I think about bike gearing in terms of gear inches rather than gear ratios &#8211; an <a href=\"https:\/\/www.competitivecyclist.com\/learn\/a-matter-of-gearing\">explanation of gear inches and gear development is here<\/a>. Whenever I&#8217;m thinking about gearing my first stop is the late Sheldon Brown&#8217;s site &#8211; there&#8217;s an online calculator and tons of info on internally geared hubs. Before I started calculating, though, <a href=\"https:\/\/www.sheldonbrown.com\/harris\/rohloff.html\">this stopped me short<\/a>:<\/p>\n<blockquote><p>To maintain optimum functionality and safety of the Speedhub, the lowest allowable gear combinations are 42\/17, 38\/16 or 36\/15. These are the equivalent to a 22\/32 combination on a conventional drivetrain.<\/p><\/blockquote>\n<p>So, apparently, there&#8217;s a minimum amount of torque needed to run a Speedhub. Will this bike supply that? I&#8217;ll assume the wheel diameter is 52 inches (a not-unusual high-wheel size) and since it&#8217;s 1:1, that&#8217;s 52 gear-inches easy-peasey. Inputting a 27.5&#215;3.0 wheel (Molly Fin&#8217;s), a 42 tooth chainwheel and a 17 tooth cog into <a href=\"https:\/\/www.sheldonbrown.com\/gear-calc.html\">Mr. Brown&#8217;s online calculator<\/a> gives us 70.9 gear inches. So, nope, wouldn&#8217;t work &#8211; or at the very least would void the warranty on a very expensive bit of German engineering (standard, that is to say, not &#8216;nonexistent unicycle-modified&#8217;, Rohloff hubs start at $1,300 and go up from there). Regardless, let&#8217;s press on! Again taking the same wheel and gearing setup, the calculator tells us that a Speedhub gives us a range of 19.8 \/ 22.4 \/ 25.5 \/ 29.0 \/\u00a032.9 \/ 37.4 \/\u00a042.5 \/\u00a048.3 \/\u00a054.8 \/\u00a062.4\u00a0\/ 70.9 \/ 80.4 \/ 91.5 \/103.9 gear inches. Since 26 is half of 52, I plugged in a 26 inch wheel and 24 teeth on both the chainwheel and cog (1:1) and then doubled the result. This high-wheeler would have a range of 14.2 \/ 16.1 \/ 18.6 \/ 21.0 \/ 23.8 \/ 27.2 \/ 31.0 \/ 35.2 \/\u00a039.8 \/ 45.4 \/ 51.6 \/ 58.4 \/ 66.6 \/ 75.6 &#8211; that&#8217;s a really l-o-w set of gears. Appropriate, I guess, for trying to maneuver a huge wheel up and down trails. To get to equivalent safety bike gearing, just grow the wheel to 71 inches (and sign up a very tall rider) or, y&#8217;know, put a chain on it.<\/p>\n<p>Note: I think my gear reasoning is sound, but am open to correction. And I&#8217;ll end with a couple relevant photos from last winter&#8217;s North American Handmade Bike Show.<\/p>\n<p style=\"text-align: center;\"><a title=\"Speedhub\" href=\"https:\/\/www.flickr.com\/photos\/doncoyote\/38551892860\/in\/album-72157692836430024\/\" data-flickr-embed=\"true\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/farm5.staticflickr.com\/4662\/38551892860_50c86d044b_z.jpg\" alt=\"Speedhub\" width=\"640\" height=\"480\" \/><\/a><\/p>\n<p style=\"text-align: center;\"><em>Speedhub cutaway<\/em><script async src=\"\/\/embedr.flickr.com\/assets\/client-code.js\" charset=\"utf-8\"><\/script><\/p>\n<p style=\"text-align: center;\"><a title=\"Unicycle\" href=\"https:\/\/www.flickr.com\/photos\/doncoyote\/45548052252\/in\/dateposted\/\" data-flickr-embed=\"true\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/farm2.staticflickr.com\/1917\/45548052252_98500eda66_z.jpg\" alt=\"Unicycle\" width=\"360\" height=\"640\" \/><\/a><script async src=\"\/\/embedr.flickr.com\/assets\/client-code.js\" charset=\"utf-8\"><\/script><\/p>\n<p style=\"text-align: center;\"><em>Unicycle!<\/em><\/p>\n<p style=\"text-align: center;\"><a title=\"36er\" href=\"https:\/\/www.flickr.com\/photos\/doncoyote\/39461048135\/in\/album-72157692836430024\/\" data-flickr-embed=\"true\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/farm5.staticflickr.com\/4675\/39461048135_1f84a3eb25_z.jpg\" alt=\"36er\" width=\"640\" height=\"360\" \/><\/a><script async src=\"\/\/embedr.flickr.com\/assets\/client-code.js\" charset=\"utf-8\"><\/script><\/p>\n<p style=\"text-align: center;\"><em>Thirtysixer!<\/em><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I fell over this hilarious thought experiment recently and thought I&#8217;d post on it as it touches on a couple of interesting topics: bike history and bike gearing. The big advancement ordinarys incorporated that put them miles ahead of their &hellip; <a href=\"http:\/\/hawkdog.net\/wordpress\/archives\/19835\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[9],"tags":[],"class_list":["post-19835","post","type-post","status-publish","format-standard","hentry","category-gearheadism"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pdqxx-59V","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"http:\/\/hawkdog.net\/wordpress\/wp-json\/wp\/v2\/posts\/19835","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/hawkdog.net\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/hawkdog.net\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/hawkdog.net\/wordpress\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/hawkdog.net\/wordpress\/wp-json\/wp\/v2\/comments?post=19835"}],"version-history":[{"count":9,"href":"http:\/\/hawkdog.net\/wordpress\/wp-json\/wp\/v2\/posts\/19835\/revisions"}],"predecessor-version":[{"id":19848,"href":"http:\/\/hawkdog.net\/wordpress\/wp-json\/wp\/v2\/posts\/19835\/revisions\/19848"}],"wp:attachment":[{"href":"http:\/\/hawkdog.net\/wordpress\/wp-json\/wp\/v2\/media?parent=19835"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/hawkdog.net\/wordpress\/wp-json\/wp\/v2\/categories?post=19835"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/hawkdog.net\/wordpress\/wp-json\/wp\/v2\/tags?post=19835"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}