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Domain > www.bikecalculator.co.uk
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DNS Resolutions
Date
IP Address
2015-01-08
79.170.40.242
(
ClassC
)
2024-09-10
185.151.30.158
(
ClassC
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Port 443
HTTP/1.1 200 date: Tue, 10 Sep 2024 19:07:50 GMTcontent-type: text/htmltransfer-encoding: chunkedvary: Accept-Encodingserver: Apachex-provided-by: StackCDNlast-modified: Mon, 05 Feb 2024 10:27:49 GMTetag: W/3947-6109fe9dc503ecache-control: max-age2592000expires: Thu, 10 Oct 2024 19:07:51 GMTvary: Accept-Encodingx-origin-cache-status: MISSx-cdn-cache-status: MISSx-via: SEA1 !DOCTYPE HTML PUBLIC -//W3C//DTD HTML 4.01 Transitional//EN http://www.w3.org/TR/html4/loose.dtd>html langen>head>!-- Website developed by Blue Engine Web Development, Bratton, Wiltshire UK -->meta http-equivContent-Type contenttext/html; charsetUTF-8>meta http-equivContent-Language contenten-GB>title>Bicycle Gear Calculator - speed power cadence gear ratio air resistance/title>meta nameDescription CONTENTGraph and analyse each bicycle gear ratio for hub and derailleur gears - speed power cadence gear ratio air resistance>meta namekeywords CONTENThub , Derailleur>meta nameformat-detection contenttelephoneno>meta nameAuthor contentBlue Engine Web Development, Bratton, Wiltshire UK>meta nameviewport contentwidthdevice-width, initial-scale1>!-- if you add the Latin it looks better -->link hrefhttps://fonts.googleapis.com/css?familyRoboto:300:latin,900:latin relstylesheet> !-- needed for smooth scroll or slider if activated -->script typetext/javascript srchttps://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js>/script>!-- NOW INLINED link hrefblue_engine_responsive_menu/css/ace-responsive-menu.css relstylesheet typetext/css />script srcresize.js typetext/javascript>/script> -->link relcanonical hrefhttps://www.bicyclegearcalculator.uk >link relstylesheet hrefglobal.css typetext/css>script typetext/javascript>function load_this_page(){var window_width document.documentElement.clientWidth ;var window_height document.documentElement.clientHeight;var outer document.getElementById(outerdiv);outer.style.width (window_width) + px ;document.getElementById(diag).innerHTML window_width;this_item document.getElementById(topphonemenu) ; if (this_item ! null) {this_item.style.visibility hidden} else {alert(topphonemenu)};window.scrollBy(0, 1); // forces the scroll code to activatewindow.scrollBy(0, -1);// only needed if jump to within pagevar url window.location.href;newurl url.replace(/.*\#/,#); //alert(url);if ( newurl ! url ){ setTimeout(function(){window.location.href newurl},100);}outer.style.visibility visible;}window.onloadload_this_page;window.onresizeload_this_page;/script>/head>body>div idouterdiv style visibility:hidden ; overflow:visible ; position:absolute; top:0px; left:0px>!-- outer elements -->div idtopphonemenu stylevisibility:hidden; overflow:visible; position:fixed; ; top:50px; right:0px; font-size:20px ;background:#ffffff;z-index:26> script typetext/javascript> function togglephonemenu() { var tm document.getElementById(topphonemenu); var status tm.style.visibility; if (status visible) { tm.style.visibility hidden; } else { tm.style.visibility visible; } } /script> div stylebackground:#272526;> div classmenutable> div classpad-20 pad-r-20> a idtopbuttonindex stylefont-size:15px;color:#444444;text-decoration:none hrefindex.htm>Home/a> /div> div classpad-20 pad-r-20> a idtopbuttonpage1 stylefont-size:15px;color:#444444;text-decoration:none hrefderailleurgears.htm>Derailleur gears/a> /div> div classpad-20 pad-r-20> a idtopbuttonpage2 stylefont-size:15px;color:#444444;text-decoration:none hrefhubgears.htm>Hub gears/a> /div> div classpad-20 pad-r-20> a idtopbuttoncontact stylefont-size:15px;color:#444444;text-decoration:none hrefcontact.htm>Contact/a> /div>/div> /div>/div>div idtopmenu stylevisibility:visible; overflow:visible; position:fixed; ; top:0px; left:0px ;width:100%;; z-index:25;background:#ffffff ;border-bottom:1px solid #fc4c02 > script typetext/javascript> $(function(){ $(window).scroll(function(){ //parallax(); var _cur_top $(window).scrollTop(); }); });/script>!-- SMOOTH SCROLL -->script typetext/javascript>$(function() { $(ahref*#:not(href#)).click(function() { if (location.pathname.replace(/^\//,) this.pathname.replace(/^\//,) && location.hostname this.hostname) { var target $(this.hash); target target.length ? target : $(name + this.hash.slice(1) +); if (target.length) { $(html,body).animate({ scrollTop: target.offset().top }, 1000); return false; } } });});/script> div idtopmenutable classmargin-a center w100p> div classval-m w100p center pad-t-12 pad-b-12 pad-l-2 pad-r-2> div idtopleft class menutopleft val-m left white> span classbold stylecolor:#fc4c02>Bicycle Gear Calculator/span> /div> div idtopright class menutopright val-m right floatright> div idlinemenu classdisplaynone1050 font18>div classmenutable> div classdisplay-ib pad-r-20> a idbuttonindex stylefont-size:15px;color:#444444;text-decoration:none hrefindex.htm>Home/a> /div> div classdisplay-ib pad-r-20> a idbuttonpage1 stylefont-size:15px;color:#444444;text-decoration:none hrefderailleurgears.htm>Derailleur gears/a> /div> div classdisplay-ib pad-r-20> a idbuttonpage2 stylefont-size:15px;color:#444444;text-decoration:none hrefhubgears.htm>Hub gears/a> /div> div classdisplay-ib pad-r-20> a idbuttoncontact stylefont-size:15px;color:#444444;text-decoration:none hrefcontact.htm>Contact/a> /div>/div>/div> div idhamburgermenu classdisplayblock1050>div idhamburger styletext-align:right>img srcmenu/hamburger.png altPhone menu onclicktogglephonemenu() stylecursor: pointer;vertical-align:top;padding:0px 8px 0px 0px>/div>/div> /div> /div> /div>/div>style typetext/css>.storyboard-1 { background-image: url(storyboard/front-der-bw.jpg)}.storyboard-2 { background-image: url(storyboard/technology_bicycle-bw.jpg)}.storyboard-3 { background-image: url(storyboard/racing-bicycles-bw.jpg)}.storyboard-4 { background-image: url(storyboard/rear-cassette-bw.jpg)}/style>script typetext/javascript> document.getElementById(buttonindex).style.borderBottom 1px solid #aaaaaa ; document.getElementById(topbuttonindex).style.borderBottom 1px solid #aaaaaa ;/script>div styleheight:80px>/div>div classcenter w100p wm1200px pad-10 margin-a>h1>Calculate the speed and power requirements of different sprocket sizes for different Hub and Derailleur gears/h1>/div>div classwm1400px w100p pad-10 margin-a> div classcontainer-2-700> div classitem-2-700> h3>Graph and analyse each gear ratio/h3> br> Select your hub type or gear set and graph and analyse each ratio. ul> li>Is your lowest gear low enough for those steep hills?/li> li>Is you highest gear fast enough for your desired top speed?/li> li>Have you enough gears to stay in your optimum cadence range?/li> li>For each gear how much power do you have to produce to go at a given speed and how much power is lost due to friction and air resistance?/li> li>For each given speed point, which gears can you be in to stay in cadence range/li> /ul> Graphically compare the effects of cadence / gear calculating speed. br>br> Cadence is the number of revolutions of the crank per minute, this is the rate at which a cyclist is pedalling/turning the pedals. br>br> Choose your ideal gearing for your make of hub / gearsets / power or riding style. br>br> Make sure you stay in the green zone! /div> div classitem-2-700> h3>Pick your gear type:/h3> br>br> a hrefderailleurgears.htm classwhite font20> div classw180px stylebackground:#e34402; display: inline-block; padding:15px> Derailleur gears /div> /a> br>br> a hrefhubgears.htm classwhite font20> div classw180px stylebackground:#e34402; display: inline-block; padding:15px> Hub gears /div> /a> br>br> h3>Information:/h3> br>br> a href#explaincadence classwhite font20> div classw180px stylebackground:#e34402; display: inline-block; padding:15px> Documentation /div> /a> /div> /div> /div>div styleheight:70px>/div>a idexplaincadence nameexplaincadence>div classcenter storyboard storyboard-3 backgroundcludgeforchrome>div styleheight:100px>/div>!-- container start -->div classcontainer-2-700> div classitem-2-700> div class val-t wmin300px pad-30 styletop: 80px; background-color:#ffffff> div styleheight:25px>/div> a idcadence namecadence>/a>h3>Cadence - the number of revolutions of the crank per minute/h3>br>br>Cadence is the number of revolutions of the crank per minute, this is the rate at which a cyclist is pedalling/turning the pedals. br>br>Take a look at the a hrefhttp://en.wikipedia.org/wiki/Cadence_%28cycling%29 target_blank relnofollow>Wikipedia article on bicycle cadence/a>.br>br>There has been much scientific research on optimum cadence. For most people a cadence of 60 to 100 rpm is a comfortable range,with some sources measuring maximum power at 85 rpm and others at 90 - 95 rpm. Even if you do not have expensive instrumentation, you can measure your own preferred cadence.Zip tie a cheap watch (or a speedo with a timer) to your handlebars and count how many times your pedals rotate when you are pedalling hard.Factors are the degree of fitness of the rider and the degree to which efficiency or peak power are important.br>br>a classgrey22 href#top>Return to top/a> div styleheight:25px>/div> /div> /div> div classitem-2-700> div classheight1> /div> /div>/div>div styleheight:100px>/div>/div>a idexplaingearing nameexplaingearing >div classcenter storyboard storyboard-4 backgroundcludgeforchrome>div styleheight:100px>/div>!-- container start -->div classcontainer-2-700> div classitem-2-700> div class val-t wmin300px pad-30 styletop: 80px; background-color:#ffffff> div styleheight:25px>/div> a namegearcalculation idgearcalculation>/a>h3>Gear calculation/h3>br>Use this website to choose the ideal gearing for your personal riding style.ul>li>At the high speed end, how fast do you want to be able to go with a cadence near your maximum?Can you produce enough power to achieve this speed, on the flat, uphill/downhill, and with a headwind / tailwind?/li>li>At cadences lower than 60 rpm it is harder work to create a given amount of power.Sure, athletes can create high power at low revs but it is still less efficient than pedalling faster!So, at the low end do you have a suitable gear that you can pedal within your cadence range that will get you up a steep hill?/li>li>Inbetween, have you enough gears to be able to pedal at all speeds and keep within your target cadence range.It is inefficient if when you reach your max cadence in one gear the change to the next gear takes you below your min cadence./li>/ul> Click on a classaction href#outputanalysis>View analysis/a> and information is provided for that gear set and for your personal information:ul>li>For that gear set what gradient of hill you can climb given your preferred cadence, weight and power capabilities./li>li>What power is required to pedal at different speeds in different gears with and without a headwind./li>li>For each gear ratio; what speed could you achieve within your cadence range and how many gear inches does the gear equate to./li>li>For each MPH point - which gear combinations could you use at this MPH and remain within cadence range/li>/ul>Change you gearing and see what the effect is.br>br>h3>Gear calculation input data/h3>br>A figure of two watts (of power) per Kg of body weight is often quoted as a maximum sustainable power for a fit person. Athletes can produce figures much higher than this.br>br>The calculations take frictional losses (tyres, bearings, chain), air drag and energy to climb a gradient into account when calculating power requirements.br>br>The calculations for air resistance with a headwind / tailwind (enter a negative headwind) assume the wind is not at an angle and not affected by objects such as buildings or hedges.br>br>a classgrey22 href#top>Return to top/a> div styleheight:25px>/div> /div> /div> div classitem-2-700> div classheight1> /div> /div>/div>div styleheight:100px>/div>/div>a idexplainkacr nameexplainkacr>div classcenter storyboard storyboard-2 backgroundcludgeforchrome>div styleheight:100px>/div>!-- container start -->div classcontainer-2-700> div classitem-2-700> div class val-t wmin300px pad-30 styletop: 80px; background-color:#ffffff> div styleheight:25px>/div> h3>Ksub>A/sub> and Csub>R/sub>/h3>br>br>b>Ksub>A/sub> is a coeficient used in the formula that calculates air resistance:/b>br>br>Source Bicycling Science:br>br>0.368 Roadster, Utility bicyclebr>0.245 Sports bicyclebr>0.182 Road racing bicyclebr>br>Another source gives:br>0.17 for a rider tucked into an aero position.br>br>Ksub>A/sub> varies from 0.1 to 0.4.br>br>b>Csub>R/sub> is a coeficient used in the formula that calculates rolling resistance:/b>br>br>Source Bicycling Science:br>br>0.008 Roadster, Utility bicyclebr>0.0053 Default quoted by many authorities.br>0.004 Sports bicyclebr>0.003 Road racing bicyclebr>br>Csub>R/sub> varies from 0.0025 to 0.008.br>br>a classgrey22 href#top>Return to top/a> div styleheight:25px>/div> /div> /div> div classitem-2-700> div classheight1> /div> /div>/div>div styleheight:100px>/div>/div>div classw100p beeeeee>div styleheight:20px>/div>div classpad-10>Web Design by a classblack hrefhttps://www.blueengine.co.uk target_blank>Blue Engine Web Development/a> © 2008-2024br>br>div iddiag classfont10>/div>/div>div styleheight:20px>/div>/div> /div>/body>/html>
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