{"id":355,"date":"2026-09-17T07:16:58","date_gmt":"2026-09-17T05:16:58","guid":{"rendered":"https:\/\/semqapps.com\/darkspeed\/sk\/kalkulacka-prevodov"},"modified":"2026-09-17T07:30:05","modified_gmt":"2026-09-17T05:30:05","slug":"kalkulacka-prevodov","status":"publish","type":"page","link":"https:\/\/semqapps.com\/darkspeed\/sk\/kalkulacka-prevodov","title":{"rendered":"Kalkula\u010dka prevodov na bicykel"},"content":{"rendered":"<p>Vyberte prevodn\u00edk, pastorok a pl\u00e1\u0161\u0165 a kalkula\u010dka ni\u017e\u0161ie v\u00e1m o tom prevode povie tri veci: ako r\u00fdchlo ide pri danej kadencii, ko\u013eko m\u00e1 palcov prevodu a ko\u013eko metrov v\u00e1s naozaj posunie jedna ot\u00e1\u010dka k\u013euky. V\u0161etko sa prepo\u010d\u00edta po\u010das p\u00edsania.<\/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=\"ako-sa-to-pocita\">Ako sa to po\u010d\u00edta<\/h2>\n<p>Bicykel nem\u00e1 prevodovku v automobilovom zmysle. To, \u010do men\u00edte pri raden\u00ed, je pomer medzi dvoma ozuben\u00fdmi kolesami, a v\u0161etko ostatn\u00e9 z neho plynie aritmeticky. Nie je tam \u017eiadny skryt\u00fd \u010dinite\u013e a ni\u010d sa nestr\u00e1ca: zmest\u00ed sa to na jeden riadok.<\/p>\n<p>V\u00e1\u0161 prevod je jednoducho prevodn\u00edk delen\u00fd pastorkom. P\u00e4\u0165desiatzub\u00fd prevodn\u00edk proti sedemn\u00e1s\u0165zub\u00e9mu pastorku d\u00e1va 2,94, \u010do znamen\u00e1, \u017ee zadn\u00e9 koleso sa oto\u010d\u00ed 2,94 kr\u00e1t na ka\u017ed\u00fa ot\u00e1\u010dku k\u013euky. Vyn\u00e1sobte to dr\u00e1hou, ktor\u00fa koleso prejde za jednu ot\u00e1\u010dku, a po\u010dtom ot\u00e1\u010dok k\u013euky za min\u00fatu, a m\u00e1te svoju r\u00fdchlos\u0165.<\/p>\n<p><strong>r\u00fdchlos\u0165 = kadencia \u00d7 (prevodn\u00edk \u00f7 pastorok) \u00d7 obvod valenia<\/strong><\/p>\n<p>Jedin\u00e1 veli\u010dina, ktor\u00e1 na bicykli nap\u00edsan\u00e1 nie je, je t\u00e1 posledn\u00e1, a t\u00fa za v\u00e1s kalkula\u010dka odvod\u00ed z rozmeru pl\u00e1\u0161\u0165a.<\/p>\n<h2 id=\"palce-prevodu-a-draha-na-otacku-kluky\">Palce prevodu a dr\u00e1ha na ot\u00e1\u010dku k\u013euky<\/h2>\n<p>Hol\u00fd pomer 2,94 s\u00e1m osebe nehovor\u00ed ni\u010d, preto\u017ee ignoruje koleso. Ten ist\u00fd pomer na horskom bicykli s r\u00e1fikmi 26 palcov a na cestnom 700C d\u00e1va dva cite\u013ene odli\u0161n\u00e9 prevody. Preto cyklisti porovn\u00e1vaj\u00fa prevody v jednotk\u00e1ch, ktor\u00e9 koleso u\u017e obsahuj\u00fa.<\/p>\n<p>Palce prevodu s\u00fa star\u0161ie z oboch: priemer, ktor\u00fd by potreboval velocip\u00e9d s priamym pohonom, aby na jedno \u0161liapnutie pre\u0161iel rovnako \u010faleko. Na prv\u00fd poh\u013ead muze\u00e1lne a napriek tomu st\u00e1le to \u010d\u00edslo, ktor\u00e9 v\u0161etci uv\u00e1dzaj\u00fa, lebo rob\u00ed dva bicykle s odli\u0161n\u00fdmi r\u00e1fikmi priamo porovnate\u013en\u00fdmi. Dr\u00e1ha na ot\u00e1\u010dku k\u013euky hovor\u00ed to ist\u00e9 v metroch a predstav\u00ed sa \u013eah\u0161ie: prevod 78 palcov v\u00e1s posunie zhruba o 6,2 metra na ka\u017ed\u00fa cel\u00fa ot\u00e1\u010dku k\u013euky.<\/p>\n<h2 id=\"ako-presne-odmerat-obvod-valenia\">Ako presne odmera\u0165 obvod valenia<\/h2>\n<p>Kalkula\u010dka odvodzuje obvod z rozmeru ISO vylisovan\u00e9ho na boku pl\u00e1\u0161\u0165a: \u03c0 \u00d7 (priemer r\u00e1fika + dvakr\u00e1t \u0161\u00edrka pl\u00e1\u0161\u0165a). Pl\u00e1\u0161\u0165 700 \u00d7 25C je ISO 25-622, tak\u017ee \u03c0 \u00d7 (622 + 50) d\u00e1va 2111 mm. Je to prieh\u013eadn\u00e9 a overite\u013en\u00e9, \u010do sa o tabu\u013ek\u00e1ch zabudovan\u00fdch vo v\u00e4\u010d\u0161ine cyklopo\u010d\u00edta\u010dov poveda\u0165 ned\u00e1: l\u00ed\u0161ia sa navz\u00e1jom a neuv\u00e1dzaj\u00fa \u017eiadny zdroj.<\/p>\n<p>Je to aj asi o percento vy\u0161\u0161ie, lebo pl\u00e1\u0161\u0165 s jazdcom hore nie je kruh. Ak chcete skuto\u010dn\u00e9 \u010d\u00edslo, odmerajte ho odvalen\u00edm: ozna\u010dte ventil\u010dek dole, sadnite na bicykel, popojdite, k\u00fdm nebude ventil\u010dek zase dole, a odmerajte medzi oboma zna\u010dkami. Zopakujte trikr\u00e1t a spriemerujte. To jedno meranie poraz\u00ed ka\u017ed\u00fa tabu\u013eku a je to z\u00e1rove\u0148 hodnota, ktor\u00fa m\u00e1 zmysel zada\u0165 do cyklopo\u010d\u00edta\u010da, aby jeho vzdialenosti sedeli.<\/p>\n<h2 id=\"sest-prevodov-prepocitanych\">\u0160es\u0165 prevodov, prepo\u010d\u00edtan\u00fdch<\/h2>\n<p>V\u0161etk\u00fdch \u0161es\u0165 s pl\u00e1\u0161\u0165om 700 \u00d7 25C, teda s obvodom 2111 mm. R\u00fdchlosti po\u010d\u00edtaj\u00fa s 90 rpm, kadenciou, ktor\u00fa v\u00e4\u010d\u0161ina udr\u017e\u00ed v rovine.<\/p>\n<table>\n<thead>\n<tr>\n<th>Prevod<\/th>\n<th>Na \u010do je<\/th>\n<th>Palce prevodu<\/th>\n<th>Dr\u00e1ha na ot\u00e1\u010dku k\u013euky<\/th>\n<th>km\/h pri 90 rpm<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>34 \/ 28<\/td>\n<td>Prudk\u00e9 st\u00fapanie<\/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>Zvlnen\u00fd ter\u00e9n<\/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>Jazda po rovine<\/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>R\u00fdchla jazda v skupine<\/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>\u0160print<\/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>Typick\u00fd 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=\"aka-kadencia-k-akemu-prevodu\">Ak\u00e1 kadencia k ak\u00e9mu prevodu<\/h2>\n<p>Kalkula\u010dka v\u00e1m ochotne povie, \u017ee 50 \u00d7 11 pri 110 rpm je 63 km\/h. Nepovie v\u00e1m, \u017ee to skoro nikto neudr\u017e\u00ed, a pr\u00e1ve tu kalkula\u010dka prevodov prest\u00e1va sta\u010di\u0165. Ak\u00fd prevod rozto\u010d\u00edte, obmedzuje v\u00fdkon, ktor\u00fd m\u00e1te, a kadencia rozhoduje o tom, \u010di ten v\u00fdkon poch\u00e1dza zo svalovej sily, alebo zo srdca a p\u013e\u00fac.<\/p>\n<p>Stru\u010dne: pre v\u00e4\u010d\u0161inu je u\u017eito\u010dn\u00e9 rozmedzie 70 a\u017e 100 rpm a spr\u00e1vny prevod je ten, ktor\u00fd v\u00e1s v \u0148om udr\u017e\u00ed na ter\u00e9ne, po ktorom idete. Ak sa v st\u00fapan\u00ed ocitnete pod 70 rpm, odpove\u010fou je \u013eah\u0161\u00ed prevod, nie v\u00e4\u010d\u0161ia snaha. <a href=\"https:\/\/semqapps.com\/darkspeed\/sk\/kadencia-cyklistika\">Sprievodca kadenciou<\/a> rozober\u00e1 tieto rozmedzia, to, \u010do v\u00fdskum skuto\u010dne nameral, a tri tr\u00e9ningov\u00e9 jednotky na ich roz\u0161\u00edrenie.<\/p>\n<h2 id=\"caste-otazky\">\u010cast\u00e9 ot\u00e1zky<\/h2>\n<p><strong>Ak\u00fd prevod je dobr\u00fd na cestn\u00fd bicykel?<\/strong> Na be\u017en\u00e9 jazdenie pokryj\u00fa k\u013euky 50\/34 s kazetou 11-32 skoro v\u0161etko: zhruba 28 palcov dole na prudk\u00e9 st\u00fapania a zhruba 120 hore na zjazdy.<\/p>\n<p><strong>\u010co s\u00fa palce prevodu?<\/strong> Priemer kolesa, ktor\u00fd by potreboval bicykel s priamym pohonom, aby na jedno \u0161liapnutie pre\u0161iel rovnak\u00fa vzdialenos\u0165. Sp\u00f4sob, ako porovna\u0165 prevody medzi bicyklami s r\u00f4zne ve\u013ek\u00fdmi kolesami.<\/p>\n<p><strong>Ako vypo\u010d\u00edtam r\u00fdchlos\u0165 z kadencie a prevodu?<\/strong> Vyn\u00e1sobte kadenciu prevodom a obvodom valenia. Pri 90 rpm s 50\/17 a kolesom 2111 mm to d\u00e1 33,5 km\/h.<\/p>\n<p><strong>Men\u00ed \u0161\u00edrka pl\u00e1\u0161\u0165a m\u00f4j prevod?<\/strong> Nepatrne. Prechod z 25 mm na 32 mm prid\u00e1 asi 44 mm obvodu, \u010do s\u00fa zhruba dve percent\u00e1 r\u00fdchlosti navy\u0161e pri rovnakej kadencii a rovnakom prevode.<\/p>\n<p><strong>Ak\u00fd obvod m\u00e1m zada\u0165 do cyklopo\u010d\u00edta\u010da?<\/strong> Ten, ktor\u00fd nameriate odvalen\u00edm bicykla so svojou v\u00e1hou hore. Tabu\u013ekov\u00e9 hodnoty b\u00fdvaj\u00fa o percento optimistick\u00e9, \u010do je na 40 km asi 400 metrov.<\/p>\n<p><strong>Je \u0165a\u017e\u0161\u00ed prevod v\u017edy r\u00fdchlej\u0161\u00ed?<\/strong> Len ak ho e\u0161te rozto\u010d\u00edte pri rozumnej kadencii. Prevod, ktor\u00fd drv\u00edte pri 55 rpm, d\u00e1va dlhodobo men\u0161\u00ed v\u00fdkon ne\u017e \u013eah\u0161\u00ed rozto\u010den\u00fd na 90.<\/p>\n<p><strong>Ak\u00fa kadenciu m\u00e1m h\u013eada\u0165?<\/strong> V\u00e4\u010d\u0161ine vyhovuje rozmedzie 70 a\u017e 100 rpm, pri\u010dom zhruba 90 rpm je naj\u010dastej\u0161ie uv\u00e1dzan\u00e1 referen\u010dn\u00e1 hodnota.<\/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>Vypo\u010d\u00edtajte r\u00fdchlos\u0165, palce prevodu a dr\u00e1hu na ot\u00e1\u010dku k\u013euky z prevodn\u00edka, pastorka a pl\u00e1\u0161\u0165a. \u0160es\u0165 be\u017en\u00fdch prevodov a ako presne odmera\u0165 obvod kolesa.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":83,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-355","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/semqapps.com\/darkspeed\/wp-json\/wp\/v2\/pages\/355","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=355"}],"version-history":[{"count":1,"href":"https:\/\/semqapps.com\/darkspeed\/wp-json\/wp\/v2\/pages\/355\/revisions"}],"predecessor-version":[{"id":409,"href":"https:\/\/semqapps.com\/darkspeed\/wp-json\/wp\/v2\/pages\/355\/revisions\/409"}],"up":[{"embeddable":true,"href":"https:\/\/semqapps.com\/darkspeed\/wp-json\/wp\/v2\/pages\/83"}],"wp:attachment":[{"href":"https:\/\/semqapps.com\/darkspeed\/wp-json\/wp\/v2\/media?parent=355"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}