{"id":357,"date":"2026-09-17T07:16:59","date_gmt":"2026-09-17T05:16:59","guid":{"rendered":"https:\/\/semqapps.com\/darkspeed\/sv\/utvaxlingskalkylator"},"modified":"2026-09-17T07:30:06","modified_gmt":"2026-09-17T05:30:06","slug":"utvaxlingskalkylator","status":"publish","type":"page","link":"https:\/\/semqapps.com\/darkspeed\/sv\/utvaxlingskalkylator","title":{"rendered":"Utv\u00e4xlingskalkylator f\u00f6r cykel"},"content":{"rendered":"<p>V\u00e4lj drev, kugghjul och d\u00e4ck, s\u00e5 s\u00e4ger kalkylatorn nedan tre saker om den utv\u00e4xlingen: hur fort den g\u00e5r vid en given kadens, hur m\u00e5nga utv\u00e4xlingstum den \u00e4r, och hur l\u00e5ngt ett vevvarv faktiskt flyttar dig. Allt r\u00e4knas om medan du skriver.<\/p>\n<div class=\"calc\" data-imperial=\"1\" data-unit=\"mph\" data-decimal=\".\">\n  <h2 class=\"calc-title\" id=\"darkspeed-calculator\"><a href=\"https:\/\/semqapps.com\/darkspeed\/bike-gear-ratio-calculator\">Cadence and gearing calculator<\/a><\/h2>\n  <p class=\"calc-lead\">Set your gear and your cadence, then read off the speed. Everything updates as you type.<\/p>\n\n  <div class=\"calc-grid\">\n    <label class=\"calc-field\">\n      <span class=\"calc-label\">Cadence<\/span>\n      <span class=\"calc-input\">\n        <input type=\"number\" id=\"calc-cadence\" value=\"90\" min=\"20\" max=\"200\" step=\"1\" inputmode=\"numeric\" \/>\n        <span class=\"calc-suffix\">rpm<\/span>\n      <\/span>\n    <\/label>\n\n    <label class=\"calc-field\">\n      <span class=\"calc-label\">Chainring<\/span>\n      <span class=\"calc-input\">\n        <input type=\"number\" id=\"calc-chainring\" value=\"50\" min=\"20\" max=\"60\" step=\"1\" inputmode=\"numeric\" \/>\n        <span class=\"calc-suffix\">T<\/span>\n      <\/span>\n    <\/label>\n\n    <label class=\"calc-field\">\n      <span class=\"calc-label\">Sprocket<\/span>\n      <span class=\"calc-input\">\n        <input type=\"number\" id=\"calc-cog\" value=\"17\" min=\"9\" max=\"52\" step=\"1\" inputmode=\"numeric\" \/>\n        <span class=\"calc-suffix\">T<\/span>\n      <\/span>\n    <\/label>\n\n    <label class=\"calc-field\">\n      <span class=\"calc-label\">Wheel and tire<\/span>\n      <span class=\"calc-input\">\n        <select id=\"calc-wheel\">\n                    <option value=\"700x23c\"\n                  data-circ=\"2099\"\n                  >700 \u00d7 23C<\/option>\n                    <option value=\"700x25c\"\n                  data-circ=\"2111\"\n                   selected='selected'>700 \u00d7 25C<\/option>\n                    <option value=\"700x28c\"\n                  data-circ=\"2130\"\n                  >700 \u00d7 28C<\/option>\n                    <option value=\"700x32c\"\n                  data-circ=\"2155\"\n                  >700 \u00d7 32C<\/option>\n                    <option value=\"700x38c\"\n                  data-circ=\"2193\"\n                  >700 \u00d7 38C<\/option>\n                    <option value=\"29x2.25\"\n                  data-circ=\"2312\"\n                  >29 \u00d7 2.25<\/option>\n                    <option value=\"650bx47\"\n                  data-circ=\"2130\"\n                  >650B \u00d7 47 (27.5 \u00d7 1.85)<\/option>\n                    <option value=\"27.5x2.1\"\n                  data-circ=\"2168\"\n                  >27.5 \u00d7 2.10<\/option>\n                    <option value=\"26x2.1\"\n                  data-circ=\"2089\"\n                  >26 \u00d7 2.10<\/option>\n                    <option value=\"20x1.75\"\n                  data-circ=\"1552\"\n                  >20 \u00d7 1.75<\/option>\n                  <\/select>\n      <\/span>\n    <\/label>\n  <\/div>\n\n  <p class=\"calc-result\">\n    <output id=\"calc-out\" for=\"calc-cadence calc-chainring calc-cog calc-wheel\">\n      <strong id=\"calc-speed\">20.8<\/strong>\n      <span class=\"calc-unit\">mph<\/span>\n    <\/output>\n  <\/p>\n\n  <ul class=\"calc-secondary\">\n    <li>\n      <span class=\"calc-sec-label\">Gear inches<\/span>\n      <span class=\"calc-sec-value\" id=\"calc-inches\">77.8<\/span>\n    <\/li>\n    <li>\n      <span class=\"calc-sec-label\">Distance per pedal turn<\/span>\n      <span class=\"calc-sec-value\"><span id=\"calc-dev\">6.2<\/span> m<\/span>\n    <\/li>\n    <li>\n      <span class=\"calc-sec-label\">Rolling circumference<\/span>\n      <span class=\"calc-sec-value\"><span id=\"calc-circ\">2111<\/span> mm<\/span>\n    <\/li>\n  <\/ul>\n\n  <h3 class=\"calc-table-title\">The same gear at other cadences<\/h3>\n  <div class=\"calc-table-wrap\">\n    <table class=\"calc-table\">\n      <thead>\n        <tr>\n          <th scope=\"col\">Cadence<\/th>\n          <th scope=\"col\">mph<\/th>\n        <\/tr>\n      <\/thead>\n      <tbody id=\"calc-rows\">\n                <tr>\n          <td>60 rpm<\/td>\n          <td>13.9<\/td>\n        <\/tr>\n                <tr>\n          <td>70 rpm<\/td>\n          <td>16.2<\/td>\n        <\/tr>\n                <tr>\n          <td>80 rpm<\/td>\n          <td>18.5<\/td>\n        <\/tr>\n                <tr>\n          <td>90 rpm<\/td>\n          <td>20.8<\/td>\n        <\/tr>\n                <tr>\n          <td>100 rpm<\/td>\n          <td>23.1<\/td>\n        <\/tr>\n                <tr>\n          <td>110 rpm<\/td>\n          <td>25.5<\/td>\n        <\/tr>\n              <\/tbody>\n    <\/table>\n  <\/div>\n\n  <p class=\"calc-note\">The circumference is worked out from the ISO size printed on the tire wall: \u03c0 \u00d7 (rim diameter + twice the tire width). That runs about one percent above the tables built into bike computers, because a loaded tire is not a circle. For an exact figure, mark the valve, roll the bike forward one full turn with your weight on it, and measure the distance.<\/p>\n<\/div>\n<h2 id=\"sa-gar-utrakningen-till\">S\u00e5 g\u00e5r utr\u00e4kningen till<\/h2>\n<p>En cykel har ingen v\u00e4xell\u00e5da i bilmening. Det du \u00e4ndrar n\u00e4r du v\u00e4xlar \u00e4r ett f\u00f6rh\u00e5llande mellan tv\u00e5 kugghjul, och allt annat f\u00f6ljer av det rent aritmetiskt. Det finns ingen dold faktor och inget g\u00e5r f\u00f6rlorat: alltihop f\u00e5r plats p\u00e5 en rad.<\/p>\n<p>Din utv\u00e4xling \u00e4r helt enkelt drevet delat med kugghjulet. Ett drev med 50 kuggar mot ett kugghjul med 17 ger 2,94, vilket betyder att bakhjulet snurrar 2,94 varv f\u00f6r varje vevvarv. Multiplicera det med hur l\u00e5ngt hjulet rullar p\u00e5 ett varv och med hur m\u00e5nga vevvarv du g\u00f6r per minut, s\u00e5 har du din fart.<\/p>\n<p><strong>fart = kadens \u00d7 (drev \u00f7 kugghjul) \u00d7 rullomkrets<\/strong><\/p>\n<p>Den enda term som inte st\u00e5r p\u00e5 cykeln \u00e4r den sista, och den r\u00e4knar kalkylatorn fram \u00e5t dig ur d\u00e4ckstorleken.<\/p>\n<h2 id=\"utvaxlingstum-och-stracka-per-vevvarv\">Utv\u00e4xlingstum och str\u00e4cka per vevvarv<\/h2>\n<p>Ett naket f\u00f6rh\u00e5llande p\u00e5 2,94 s\u00e4ger ingenting i sig, f\u00f6r det bortser fr\u00e5n hjulet. Samma f\u00f6rh\u00e5llande p\u00e5 en 26-tums mountainbike och p\u00e5 en 700C racer ger tv\u00e5 m\u00e4rkbart olika v\u00e4xlar. D\u00e4rf\u00f6r j\u00e4mf\u00f6r cyklister v\u00e4xlar i enheter som redan inneh\u00e5ller hjulet.<\/p>\n<p>Utv\u00e4xlingstum \u00e4r den \u00e4ldre av de tv\u00e5: den diameter en direktdriven h\u00f6ghjuling skulle beh\u00f6va f\u00f6r att rulla lika l\u00e5ngt per tramptag. Museal vid f\u00f6rsta anblicken och \u00e4nd\u00e5 det tal alla n\u00e4mner, eftersom det g\u00f6r tv\u00e5 cyklar med olika hjul direkt j\u00e4mf\u00f6rbara. Str\u00e4cka per vevvarv s\u00e4ger samma sak i meter och \u00e4r l\u00e4ttare att f\u00f6rest\u00e4lla sig: en v\u00e4xel p\u00e5 78 tum flyttar dig ungef\u00e4r 6,2 meter f\u00f6r varje helt vevvarv.<\/p>\n<h2 id=\"sa-mater-du-rullomkretsen-exakt\">S\u00e5 m\u00e4ter du rullomkretsen exakt<\/h2>\n<p>Kalkylatorn r\u00e4knar fram omkretsen ur ISO-m\u00e5ttet i d\u00e4cksidan: \u03c0 \u00d7 (f\u00e4lgdiameter + tv\u00e5 g\u00e5nger d\u00e4ckbredden). Ett 700 \u00d7 25C \u00e4r ISO 25-622, s\u00e5 \u03c0 \u00d7 (622 + 50) ger 2111 mm. Det \u00e4r genomskinligt och kontrollerbart, vilket inte kan s\u00e4gas om tabellerna i de flesta cykeldatorer: de skiljer sig \u00e5t och anger ingen k\u00e4lla.<\/p>\n<p>Det ligger ocks\u00e5 ungef\u00e4r en procent f\u00f6r h\u00f6gt, f\u00f6r ett d\u00e4ck med en cyklist p\u00e5 \u00e4r ingen cirkel. Vill du ha det riktiga talet, g\u00f6r utrullningsprovet: m\u00e4rk ventilen nedtill, s\u00e4tt dig p\u00e5 cykeln, rulla fram\u00e5t tills ventilen \u00e4r nedtill igen och m\u00e4t mellan de tv\u00e5 m\u00e4rkena. Upprepa tre g\u00e5nger och ta medelv\u00e4rdet. Den enda m\u00e4tningen sl\u00e5r varje tabell, och det \u00e4r ocks\u00e5 talet du ska mata in i cykeldatorn f\u00f6r att dess str\u00e4ckor ska st\u00e4mma.<\/p>\n<h2 id=\"sex-vaxlar-genomraknade\">Sex v\u00e4xlar, genomr\u00e4knade<\/h2>\n<p>Alla sex med ett 700 \u00d7 25C d\u00e4ck, allts\u00e5 2111 mm omkrets. Farterna utg\u00e5r fr\u00e5n 90 rpm, en kadens de flesta h\u00e5ller p\u00e5 plant.<\/p>\n<table>\n<thead>\n<tr>\n<th>V\u00e4xel<\/th>\n<th>Vad den \u00e4r till f\u00f6r<\/th>\n<th>Utv\u00e4xlingstum<\/th>\n<th>Str\u00e4cka per vevvarv<\/th>\n<th>km\/h vid 90 rpm<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>34 \/ 28<\/td>\n<td>Brant stigning<\/td>\n<td>32,1<\/td>\n<td>2,6 m<\/td>\n<td>13,8<\/td>\n<\/tr>\n<tr>\n<td>34 \/ 21<\/td>\n<td>Kuperat<\/td>\n<td>42,8<\/td>\n<td>3,4 m<\/td>\n<td>18,5<\/td>\n<\/tr>\n<tr>\n<td>50 \/ 17<\/td>\n<td>Rullande p\u00e5 plant<\/td>\n<td>77,8<\/td>\n<td>6,2 m<\/td>\n<td>33,5<\/td>\n<\/tr>\n<tr>\n<td>50 \/ 14<\/td>\n<td>Snabb grupptur<\/td>\n<td>94,5<\/td>\n<td>7,5 m<\/td>\n<td>40,7<\/td>\n<\/tr>\n<tr>\n<td>50 \/ 11<\/td>\n<td>Spurt<\/td>\n<td>120,2<\/td>\n<td>9,6 m<\/td>\n<td>51,8<\/td>\n<\/tr>\n<tr>\n<td>42 \/ 16<\/td>\n<td>Typisk singlespeed<\/td>\n<td>69,4<\/td>\n<td>5,5 m<\/td>\n<td>29,9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 id=\"vilken-kadens-till-vilken-vaxel\">Vilken kadens till vilken v\u00e4xel<\/h2>\n<p>Kalkylatorn s\u00e4ger g\u00e4rna att 50 \u00d7 11 vid 110 rpm \u00e4r 63 km\/h. Den s\u00e4ger inte att n\u00e4stan ingen orkar h\u00e5lla det, och d\u00e4r slutar en utv\u00e4xlingskalkylator att r\u00e4cka. Vilken v\u00e4xel du kan dra begr\u00e4nsas av den effekt du har, och kadensen avg\u00f6r om den effekten kommer fr\u00e5n muskelstyrka eller fr\u00e5n hj\u00e4rta och lungor.<\/p>\n<p>Kort sagt: f\u00f6r de flesta \u00e4r det anv\u00e4ndbara intervallet 70 till 100 rpm, och r\u00e4tt v\u00e4xel \u00e4r den som h\u00e5ller dig d\u00e4r p\u00e5 det underlag du k\u00f6r p\u00e5. Hamnar du under 70 rpm i en stigning \u00e4r svaret en l\u00e4ttare v\u00e4xel, inte mer anstr\u00e4ngning. <a href=\"https:\/\/semqapps.com\/darkspeed\/sv\/kadens-cykling\">Kadensguiden<\/a> g\u00e5r igenom intervallen, vad forskningen faktiskt m\u00e4tt, och tre pass f\u00f6r att vidga dem.<\/p>\n<h2 id=\"vanliga-fragor\">Vanliga fr\u00e5gor<\/h2>\n<p><strong>Vilken v\u00e4xel \u00e4r bra p\u00e5 en racercykel?<\/strong> F\u00f6r allm\u00e4n cykling t\u00e4cker ett 50\/34 vevparti med en 11-32 kassett n\u00e4stan allt: runt 28 tum i botten f\u00f6r branta stigningar och runt 120 i toppen f\u00f6r utf\u00f6rsl\u00f6por.<\/p>\n<p><strong>Vad \u00e4r utv\u00e4xlingstum?<\/strong> Den hjuldiameter en direktdriven cykel skulle beh\u00f6va f\u00f6r att f\u00e4rdas lika l\u00e5ngt per tramptag. Ett s\u00e4tt att j\u00e4mf\u00f6ra v\u00e4xlar mellan cyklar med olika hjulstorlekar.<\/p>\n<p><strong>Hur r\u00e4knar jag ut farten fr\u00e5n kadens och v\u00e4xel?<\/strong> Multiplicera kadensen med utv\u00e4xlingen och med rullomkretsen. Vid 90 rpm med 50\/17 och ett hjul p\u00e5 2111 mm blir det 33,5 km\/h.<\/p>\n<p><strong>\u00c4ndrar d\u00e4ckbredden min v\u00e4xel?<\/strong> Marginellt. Fr\u00e5n 25 mm till 32 mm tillkommer ungef\u00e4r 44 mm omkrets, vilket \u00e4r runt tv\u00e5 procent h\u00f6gre fart vid samma kadens och samma v\u00e4xel.<\/p>\n<p><strong>Vilken omkrets ska jag mata in i cykeldatorn?<\/strong> Den du m\u00e4ter genom att rulla ut cykeln med din vikt p\u00e5. Tabellv\u00e4rden \u00e4r oftast en procent optimistiska, vilket \u00e4r runt 400 meter p\u00e5 en tur p\u00e5 40 km.<\/p>\n<p><strong>\u00c4r en tyngre v\u00e4xel alltid snabbare?<\/strong> Bara om du fortfarande kan dra den vid en vettig kadens. En v\u00e4xel du mal runt vid 55 rpm ger mindre uth\u00e5llig effekt \u00e4n en l\u00e4ttare du spinner vid 90.<\/p>\n<p><strong>Vilken kadens ska jag sikta p\u00e5?<\/strong> De flesta m\u00e5r b\u00e4st mellan 70 och 100 rpm, med runt 90 rpm som det oftast n\u00e4mnda riktv\u00e4rdet.<\/p>\n<aside class=\"ds-cta ds-cta--band\" id=\"get\"\t       data-cta-tag=\"page\"\n\t       aria-labelledby=\"ds-cta-1\">\n\t\t<h2 class=\"ds-cta-title\" id=\"ds-cta-1\">\n\t\t\tMount it. Ride it. <span class=\"text-cyan\">Read it at a glance.<\/span>\t\t<\/h2>\n\t\t\t\t<p class=\"ds-cta-lead\">DarkSpeed is a focused, distraction-free bike speedometer for iOS and Android.<\/p>\n\t\t\t\t    <div class=\"store-buttons\" data-placement=\"article_page\">\n      <a class=\"store-btn store-btn--apple\" href=\"https:\/\/apps.apple.com\/us\/app\/darkspeed-bike-speedometer\/id6780020629?pt=129025072&#038;ct=darkspeed_www&#038;mt=8\">\n        <svg class=\"store-icon\" viewBox=\"0 0 24 24\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M17.564 12.625c-.022-2.244 1.832-3.318 1.916-3.371-1.044-1.526-2.667-1.735-3.245-1.76-1.382-.14-2.694.812-3.395.812-.7 0-1.78-.79-2.926-.768-1.506.022-2.894.874-3.668 2.22-1.564 2.71-.4 6.722 1.124 8.927.745 1.08 1.633 2.293 2.799 2.25 1.124-.046 1.55-.726 2.91-.726 1.36 0 1.742.726 2.93.703 1.21-.022 1.976-1.1 2.717-2.184.856-1.252 1.21-2.466 1.232-2.528-.027-.012-2.367-.91-2.394-3.575zm-2.225-6.575c.62-.752 1.04-1.798.926-2.844-.896.036-1.984.595-2.625 1.346-.575.666-1.078 1.733-.943 2.756 1 .078 2.022-.508 2.642-1.258z\"\/><\/svg>\n        <span>\n          <small>Download on the<\/small>\n          <strong>App Store<\/strong>\n        <\/span>\n      <\/a>\n      <a class=\"store-btn store-btn--google\" href=\"https:\/\/play.google.com\/store\/apps\/details?id=com.darkspeed.app&#038;referrer=utm_source%3Dsemqapps.com%26utm_medium%3Dreferral%26utm_campaign%3Ddarkspeed_www%26utm_content%3Den%26utm_term%3Dpage\">\n        <svg class=\"store-icon\" viewBox=\"0 0 24 24\" aria-hidden=\"true\">\n          <path fill=\"#34A853\" d=\"M3 20.5V3.5c0-.4.1-.7.3-1l10 10-10 10c-.2-.3-.3-.6-.3-1z\"\/>\n          <path fill=\"#FBBC04\" d=\"M16.8 12L20.4 9.9c.8.5 1.3 1.2 1.3 2.1s-.5 1.6-1.3 2.1L16.8 12z\"\/>\n          <path fill=\"#EA4335\" d=\"M13.3 12.5l3.5 3.5-12 6.7c-.5.3-1 .2-1.5-.2l10-10z\"\/>\n          <path fill=\"#4285F4\" d=\"M13.3 11.5L3.3 1.5c.5-.4 1-.5 1.5-.2l12 6.7-3.5 3.5z\"\/>\n        <\/svg>\n        <span>\n          <small>GET IT ON<\/small>\n          <strong>Google Play<\/strong>\n        <\/span>\n      <\/a>\n    <\/div>\n    \t<\/aside>\n","protected":false},"excerpt":{"rendered":"<p>R\u00e4kna ut fart, utv\u00e4xlingstum och str\u00e4cka per vevvarv fr\u00e5n drev, kugghjul och d\u00e4ck. Sex vanliga v\u00e4xlar utr\u00e4knade och hur du m\u00e4ter hjulets omkrets exakt.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":87,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-357","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/semqapps.com\/darkspeed\/wp-json\/wp\/v2\/pages\/357","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/semqapps.com\/darkspeed\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/semqapps.com\/darkspeed\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/semqapps.com\/darkspeed\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/semqapps.com\/darkspeed\/wp-json\/wp\/v2\/comments?post=357"}],"version-history":[{"count":1,"href":"https:\/\/semqapps.com\/darkspeed\/wp-json\/wp\/v2\/pages\/357\/revisions"}],"predecessor-version":[{"id":411,"href":"https:\/\/semqapps.com\/darkspeed\/wp-json\/wp\/v2\/pages\/357\/revisions\/411"}],"up":[{"embeddable":true,"href":"https:\/\/semqapps.com\/darkspeed\/wp-json\/wp\/v2\/pages\/87"}],"wp:attachment":[{"href":"https:\/\/semqapps.com\/darkspeed\/wp-json\/wp\/v2\/media?parent=357"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}