{"id":92152,"date":"2026-07-03T15:07:04","date_gmt":"2026-07-03T07:07:04","guid":{"rendered":"https:\/\/www.motomaxsfr.com\/?p=92152"},"modified":"2026-07-03T15:07:06","modified_gmt":"2026-07-03T07:07:06","slug":"40-vs-41-vs-420-chain-stop-breaking-go-kart-drivetrains","status":"publish","type":"post","link":"https:\/\/www.motomaxsfr.com\/es\/40-vs-41-vs-420-chain-stop-breaking-go-kart-drivetrains\/","title":{"rendered":"Cadena de 40, 41 o 420: se acabaron las roturas en las transmisiones de los karts"},"content":{"rendered":"<div class=\"wp-block-themepark-block-themepark-wright content-super-p  blog-jiange\" style=\"font-size:17px;line-height:28px;color:#585a5e;padding:10px 20px;\">\n<div class=\"wp-block-column\">\n<p class=\"wp-block-paragraph\">La diferencia exacta entre una cadena 40, una 41 y una 420 radica en el ancho interior y el di\u00e1metro de los rodillos, a pesar de que las tres comparten un paso est\u00e1ndar de 1\/2 pulgada. Una cadena 40 tiene un ancho interior de 5\/16\u2033 y rodillos de 5\/16\u2033; una cadena 41 se estrecha hasta un ancho de 1\/4\u2033 con rodillos m\u00e1s peque\u00f1os de 0,306\u2033; y una cadena 420 mantiene el estrecho ancho de 1\/4\u2033 de la 41, pero incorpora los rodillos m\u00e1s grandes de 5\/16\u2033 y los pasadores m\u00e1s gruesos de la 40. Los constructores rompen constantemente las transmisiones de los karts al dar por sentado que estas cadenas son intercambiables simplemente porque el paso coincide. Utilizar una cadena 41 en una rueda dentada 420 romper\u00e1 al instante los rodillos, mientras que utilizar una cadena 420 en una rueda dentada 40 provocar\u00e1 un grave atascamiento lateral. Desglosaremos la geometr\u00eda mec\u00e1nica de estas tres cadenas, pondremos de manifiesto la fatal \u201ctrampa del grosor del pi\u00f1\u00f3n\u201d y proporcionaremos un marco definitivo para dimensionar tu transmisi\u00f3n de cara a cambios de motor de alto par.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La ilusi\u00f3n del paso de 1\/2 pulgada: por qu\u00e9 NO son intercambiables<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ajustar el paso de la cadena es solo el primer paso en el montaje del sistema de transmisi\u00f3n. El paso de 1\/2 pulgada simplemente significa que la distancia entre el centro de un pasador y el centro del siguiente es exactamente de media pulgada en las series 40, 41 y 420. El error de ingenier\u00eda fatal se produce cuando los montadores ignoran las dimensiones internas.<\/p>\n\n\n\n<iframe loading=\"lazy\" width=\"657\" height=\"392\" src=\"https:\/\/www.youtube.com\/embed\/2ocPc3pZmMA\" title=\"Dimensionamiento de la cadena y la rueda dentada de un robot con tracci\u00f3n por orugas: #41 frente a #40\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n\n\n<h3 class=\"wp-block-heading\">La \u201ctrampa del grosor de la rueda dentada\u201d (error de los expertos)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">El fallo del sistema de transmisi\u00f3n se produce r\u00e1pidamente cuando se combinan anchos internos incompatibles con un grosor de pi\u00f1\u00f3n incorrecto. Un pi\u00f1\u00f3n 40 tiene un grosor aproximado de 0,284 pulgadas. Si se fuerza una cadena 41 o 420 de 1\/4 de pulgada de ancho sobre un pi\u00f1\u00f3n 40, las placas internas rozar\u00e1n con fuerza contra los dientes del pi\u00f1\u00f3n. La cadena se calentar\u00e1, se estirar\u00e1 y se romper\u00e1 en cuesti\u00f3n de minutos. Por el contrario, enrollar una cadena 40 m\u00e1s ancha alrededor de un pi\u00f1\u00f3n 420 m\u00e1s fino permite que la cadena se desv\u00ede de lado a lado, lo que provoca violentas vibraciones laterales a altas revoluciones que, con el tiempo, acabar\u00e1n por romper la ranura del embrague centr\u00edfugo.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Cadena de 40 frente a la de 420: la fuerza industrial frente a la agilidad de los deportes de motor<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Para comparar las cadenas de 40 y 420, hay que tener en cuenta sus aplicaciones industriales previstas, y no solo su resistencia a la tracci\u00f3n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Diferencias dimensionales y acoplamiento de pi\u00f1ones<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La cadena 40 es un est\u00e1ndar industrial dise\u00f1ado para maquinaria agr\u00edcola y de fabricaci\u00f3n pesada que funciona a baja velocidad. Presenta un amplio espaciado interno de 5\/16\u2033. La cadena 420 es un est\u00e1ndar para deportes de motor fabricada espec\u00edficamente para motocicletas y karts de alta velocidad, y presenta un ancho interno m\u00e1s estrecho de 1\/4\u2033. Dado que ambas utilizan exactamente el mismo di\u00e1metro de rodillo de 5\/16\u2033 (0,312\u2033), se asientan a la misma profundidad en los valles de los pi\u00f1ones. T\u00e9cnicamente, se puede utilizar una cadena 40 en una rueda dentada 420 en caso de emergencia en carretera, pero el holgura lateral de 1\/16\u2033 provocar\u00e1 un r\u00e1pido desgaste de los dientes de la rueda dentada.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Modelo de cadena<\/td><td>Pitch<\/td><td>Di\u00e1metro del rodillo<\/td><td>Anchura interior<\/td><td>Resistencia media a la tracci\u00f3n<\/td><\/tr><tr><td><strong>40<\/strong><\/td><td>0,500\u2033 (12,70 mm)<\/td><td>\ud83d\udd34&nbsp;<strong>0,312\u2033 (7,92 mm)<\/strong><\/td><td>\ud83d\udd34&nbsp;<strong>0,312\u2033 (7,95 mm)<\/strong><\/td><td>\ud83d\udd34 ~ 3.700 \u2013 4.200 libras<\/td><\/tr><tr><td><strong>41<\/strong><\/td><td>0,500\u2033 (12,70 mm)<\/td><td>\ud83d\udd34&nbsp;<strong>0,306\u2033 (7,77 mm)<\/strong><\/td><td>\ud83d\udd34&nbsp;<strong>0,250\u2033 (6,35 mm)<\/strong><\/td><td>\ud83d\udd34 ~ 2.000 \u2013 2.800 libras<\/td><\/tr><tr><td><strong>420<\/strong><\/td><td>0,500\u2033 (12,70 mm)<\/td><td>\ud83d\udd34&nbsp;<strong>0,306\u2033 (7,77 mm)<\/strong><\/td><td>\ud83d\udd34&nbsp;<strong>0,250\u2033 (6,35 mm)<\/strong><\/td><td>\ud83d\udd34 ~ 3.700 \u2013 4.100 libras<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Cadena de 41 frente a la de 420: la batalla de los anchos reducidos<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Al comparar las cadenas 41 y 420, los fabricantes se encuentran ante dos cadenas que comparten exactamente el mismo ancho interior de 1\/4\u2033. Sin embargo, sus perfiles de resistencia f\u00edsica son totalmente diferentes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Di\u00e1metro del rodillo y cizallamiento del pasador<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La cadena 41 es el eslab\u00f3n m\u00e1s d\u00e9bil de la familia de paso de 1\/2 pulgada. Utiliza un rodillo m\u00e1s peque\u00f1o, de 0,306\u2033, y placas laterales m\u00e1s finas, lo que da como resultado una resistencia a la tracci\u00f3n media de tan solo 2.000 libras. La cadena 420 mejora el rodillo a 5\/16\u2033 (0,312\u2033) y utiliza acero de mayor espesor para los pasadores, lo que eleva la resistencia a la tracci\u00f3n a m\u00e1s de 3.700 libras. Si se monta una cadena 41 en una rueda dentada 420, los rodillos m\u00e1s peque\u00f1os quedar\u00e1n demasiado altos sobre los dientes del engranaje (incumplimiento de la holgura de la l\u00ednea de paso). Esto concentra todo el par motor en las puntas de los dientes de la rueda dentada, desgast\u00e1ndolos hasta convertirlos en afiladas \u201cestrellas ninja\u201d antes de que la cadena se rompa.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Caso pr\u00e1ctico real: Conversiones a la fase 2 del Predator 212 cc<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Durante unas pruebas en pista realizadas en 2024 con minimotos modificadas, los mec\u00e1nicos aficionados sufrieron repetidas aver\u00edas en la transmisi\u00f3n al potenciar sus motores de serie de 6,5 HP. Una Predator de 212 cc de serie funciona perfectamente con una cadena ligera #41. Sin embargo, la instalaci\u00f3n de un kit de fase 2 (biela mecanizada, resortes de v\u00e1lvulas m\u00e1s resistentes y \u00e1rbol de levas de alto rendimiento) eleva la potencia por encima de los 9 HP y aumenta dr\u00e1sticamente la curva de par. Las cadenas 41 se romp\u00edan constantemente durante las aceleraciones bruscas. Al cambiar el embrague, el pi\u00f1\u00f3n trasero y la cadena por una configuraci\u00f3n espec\u00edfica 420, se eliminaron por completo los fallos en la transmisi\u00f3n sin necesidad de recurrir al gran ancho de una configuraci\u00f3n industrial 40.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">El marco de selecci\u00f3n de sistemas de transmisi\u00f3n R.T.S. (modelo experto)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Deja de ir a ciegas a la ferreter\u00eda. He desarrollado el R.T.S. Framework para garantizar una geometr\u00eda impecable de la transmisi\u00f3n en karts y minimotos personalizados.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>R \u2013 Di\u00e1metro del rodillo:<\/strong>\u00a0Comprueba el asiento del rodillo. Mide el valle de tu pi\u00f1\u00f3n. Si est\u00e1 dise\u00f1ado para un rodillo de 0,306\u2033, debes utilizar una cadena 41. Si est\u00e1 dise\u00f1ado para un rodillo de 5\/16\u2033, tus opciones se limitan a las cadenas 40 o 420.<\/li>\n\n\n\n<li><strong>T \u2013 Carga de tracci\u00f3n:<\/strong>\u00a0Calcula la potencia de tu motor. Los motores de menos de 7 HP pueden utilizar la cadena 41 con total seguridad. Las configuraciones que superen los 8 HP o que utilicen convertidores de par (CVT) requieren el dise\u00f1o con pasadores m\u00e1s resistentes de las cadenas 420 o 40 para soportar las cargas din\u00e1micas de choque.<\/li>\n\n\n\n<li><strong>S \u2013 Grosor de la rueda dentada:<\/strong>\u00a0Mide los dientes del engranaje con un calibre digital. Una rueda dentada con un grosor de aproximadamente 0,227\u2033 requiere una cadena de 41 o 420. Una rueda dentada con un grosor de aproximadamente 0,284\u2033 exige obligatoriamente una cadena de 40 para evitar que se atasquen las placas laterales.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img width=\"1024\" height=\"576\" data-public-id=\"image-411\/image-411.png\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/res.cloudinary.com\/dg7urvfyb\/images\/w_1024,h_576,c_scale\/f_auto,q_auto\/v1783087120\/image-411\/image-411.png?_i=AA\" alt=\"\" class=\"wp-post-92152 wp-image-92759\" data-transformation-crop=\"w_1024,h_576,c_scale\" data-format=\"png\" data-transformations=\"f_auto,q_auto\" data-version=\"1783087120\" data-seo=\"1\" data-responsive=\"1\" srcset=\"https:\/\/res.cloudinary.com\/dg7urvfyb\/images\/w_1024,h_576,c_scale\/f_auto,q_auto\/v1783087120\/image-411\/image-411.png?_i=AA 1672w, https:\/\/res.cloudinary.com\/dg7urvfyb\/images\/w_1648,h_927,c_scale\/f_auto,q_auto\/v1783087120\/image-411\/image-411.png?_i=AA 1648w, https:\/\/res.cloudinary.com\/dg7urvfyb\/images\/w_1448,h_814,c_scale\/f_auto,q_auto\/v1783087120\/image-411\/image-411.png?_i=AA 1448w, https:\/\/res.cloudinary.com\/dg7urvfyb\/images\/w_1248,h_702,c_scale\/f_auto,q_auto\/v1783087120\/image-411\/image-411.png?_i=AA 1248w, https:\/\/res.cloudinary.com\/dg7urvfyb\/images\/w_1048,h_589,c_scale\/f_auto,q_auto\/v1783087120\/image-411\/image-411.png?_i=AA 1048w, https:\/\/res.cloudinary.com\/dg7urvfyb\/images\/w_848,h_477,c_scale\/f_auto,q_auto\/v1783087120\/image-411\/image-411.png?_i=AA 848w, https:\/\/res.cloudinary.com\/dg7urvfyb\/images\/w_648,h_364,c_scale\/f_auto,q_auto\/v1783087120\/image-411\/image-411.png?_i=AA 648w, https:\/\/res.cloudinary.com\/dg7urvfyb\/images\/w_448,h_252,c_scale\/f_auto,q_auto\/v1783087120\/image-411\/image-411.png?_i=AA 448w, https:\/\/res.cloudinary.com\/dg7urvfyb\/images\/w_248,h_139,c_scale\/f_auto,q_auto\/v1783087120\/image-411\/image-411.png?_i=AA 248w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Preguntas frecuentes (FAQ)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>P: \u00bfSe puede montar una cadena 420 en un pi\u00f1\u00f3n de 40?<\/strong><br>No. Una cadena 420 tiene una anchura interna de 1\/4 de pulgada, mientras que una rueda dentada 40 tiene un grosor aproximado de 5\/16 de pulgada. La cadena 420 es demasiado estrecha y, f\u00edsicamente, no cabe sobre los dientes de una rueda dentada 40. Si se fuerza, la transmisi\u00f3n se atascar\u00e1 al instante.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>P: \u00bfSe puede utilizar un eslab\u00f3n maestro de 40 en una cadena de 420?<\/strong><br>No. Aunque el di\u00e1metro de los pasadores pueda parecer similar, los pasadores de un eslab\u00f3n maestro de 40 est\u00e1n cortados considerablemente m\u00e1s largos para adaptarse a la mayor separaci\u00f3n interior de 5\/16\u2033 de la cadena de 40. Si se utiliza en una cadena de 420, el clip de sujeci\u00f3n no quedar\u00e1 a ras de la placa lateral, lo que provocar\u00e1 que el eslab\u00f3n maestro se suelte por las vibraciones durante el funcionamiento.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>P: \u00bfLa cadena 428 es igual que la 420?<\/strong><br>No. Aunque ambas son cadenas para deportes de motor con un paso de 1\/2 pulgada, la cadena 428 tiene una anchura interior mayor (5\/16\u2033) y utiliza un di\u00e1metro de rodillo considerablemente mayor (0,335\u2033). Una cadena 428 no encajar\u00e1 correctamente con una rueda dentada 420.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>P: \u00bfPor qu\u00e9 se sale constantemente la cadena de mi kart?<\/strong><br>Las cadenas se salen de la cadena por tres razones principales: una desalineaci\u00f3n grave de los pi\u00f1ones (el embrague y el pi\u00f1\u00f3n trasero no est\u00e1n perfectamente paralelos), una tensi\u00f3n inadecuada de la cadena con demasiada holgura, o el uso de una combinaci\u00f3n inadecuada de cadena y pi\u00f1\u00f3n (como utilizar una cadena ancha de 40 en un pi\u00f1\u00f3n fino de 420).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>P: \u00bfQu\u00e9 cadena es la m\u00e1s adecuada para un convertidor de par (TAV2)?<\/strong><br>Los convertidores de par generan una multiplicaci\u00f3n inicial del par muy elevada. No utilices una cadena 41 con un sistema CVT, ya que el acoplamiento repentino distender\u00e1 los pasadores delgados. Especifica siempre una configuraci\u00f3n de cadena y pi\u00f1\u00f3n 420 o 40 cuando utilices un convertidor de par de la serie 30 o 40.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>P: \u00bfC\u00f3mo se distingue entre una cadena de 40 y una de 420?<\/strong><br>F\u00edjate en el ancho. Si las colocas una al lado de la otra sobre un banco de trabajo, la cadena 40 es notablemente m\u00e1s ancha. Mide el espacio interior entre las placas internas: la 420 medir\u00e1 1\/4\u2033, mientras que la 40 medir\u00e1 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